This commit was manufactured by cvs2git to create branch 'Spin_xx'.

Sprout from Black 1996-11-05 09:41:48 UTC Neil Turton <nturton@gitlab.riscosopen.org> 'Import from cleaned 360 CD'
Cherrypick from master 1996-11-21 12:08:21 UTC Neil Turton <nturton@gitlab.riscosopen.org> 'Initial revision':
    BlackLog
    hdr/RISCOS

BlackLog

+***************************************************************************
+*                                                                         *
+*  Project: RiscOS                                                        *
+*                                                                         *
+*  Module:  Kernel                                                        *
+*                                                                         *
+*  Created: Fri 30-Jul-93      By: Jonathan Roach                         *
+*                                                                         *
+*  First version: 3.21                                                    *
+*                                                                         *
+*    Copyright:    (C) 1993, Acorn Computers Ltd., Cambridge, England.    *
+*                                                                         *
+***************************************************************************
+
+Purpose:
+========
+
+
+
+***************************************************************************
+
+
+Change Log:
+===========
+
+
+---------------------------------------------------------------------------
+
+Version: 3.21 Fri 30-Jul-93        Jonathan Roach                
+
+Turned into module for first time.
+
+---------------------------------------------------------------------------
+
+Version: 3.22 Thu 26-Aug-93        Owen Love                     
+
+* Improvement in the wording of the error messages stored in the message
+file as part of the Libra project.
+
+---------------------------------------------------------------------------
+
+Version: 3.23 Wed 22-Sep-93        AGodwin                       
+
+Checked in TestSrc directory. POST currently disabled for normal startup
+and should be available only when POSTbox display is attached.
+
+---------------------------------------------------------------------------
+
+Version: 3.24 Thu 30-Sep-93        AGodwin                       
+
+Checked in updates to POST : should be fully working version.
+
+---------------------------------------------------------------------------
+
+Version: 3.25 Mon 18-Oct-93        Owen Love                     
+
+Changed 'Bad parameters for *Save' error message that was incorrect
+
+---------------------------------------------------------------------------
+
+Version: 3.26 Thu 21-Oct-93        Jonathan Roach                
+
+
+     (19-Oct-93) TDobson
+        Fix MED-00523: Remove pointer if would be completely off LHS of
+        screen, otherwise can upset display if it straddles hsync pulse.
+        Fix MED-00637: Creating dynamic area of zero maximum size now
+        works.  Screen mode 32 changed to NColour=63 and ModeFlags=0,
+        like all other numbered 256 colour modes.
+
+---------------------------------------------------------------------------
+
+ *  Changed startup code to give memory size in megabytes rather than
+    kilobytes.  Change made (conditionally) in NewReset by Bruce Cockburn
+    on 04-Nov-93.
+
+
+---------------------------------------------------------------------------
+
+Version: 3.27 Mon 15-Nov-93        Jonathan Roach                
+
+     (21-Oct-93) SCormie
+        *Configure MouseType should have called OS_Pointer.
+     (25-Oct-93) SCormie
+        NewReset now waits up to 1 sec for keyboard present.
+     (25-Oct-93) TDobson
+        Fix bug MED-00811 - initialise SpriteSize to zero on reset.
+     (25-Oct-93) JRoach
+        Fix bug MED-00680 - *Save syntax message not tokenised properly.
+     (26-Oct-93) JRoach
+        Fix bug MED-00570 - delete-power-on gives 1997. Problem was
+        delete-power-on set base to 1994 and so when the modulo of '3' came
+        out of the clock the kernel thought it had to be 1997.
+     (26-Oct-93) TDobson
+        Fix bug MED-00301 - mode selector block now alternates between two
+        overlapping ones, so that returned mode number changes each mode
+        change (although if someone goes eg M%=MODE:MODE 12:...:MODE M% it
+        will use the block specified by M%).
+     (28-Oct-93) AGlover : vduswis, vdudriver, vdugrafj, vdugrafk
+        Bugfixing session on sprites. Major points:-
+        Screensave works, and gives old format sprites where possible.
+        Screenload works, and no longer believes the mode number in the
+        sprite - it will always build a mode selector to suit the sprite.
+        EIG 0 and EIG 3 sprites supported - fixes DragASprite leaving
+        trails on-screen in these modes.
+        Mode 32 is now the monitor type 4 256 colour substitute mode.
+        GetSprite(User) ensures no LH wastage on new format sprites.
+        Screensave now copes with saving a full entry 256 colour palette.
+        Whenever possible GetSprite will make an old format sprite - if
+        you must have a new format sprite make it first with CreateSprite.
+        
+      While there are four of us intermittently touching bits of the kernel
+      please say which files you've actually altered. Thanks.           amg
+      
+      (03-Nov-93) AGlover : vdugrafj
+        Change substitute mode numbers used for 90 x 90 dpi sprites to 25-28
+        instead of 18-21.
+
+      (04-Nov-93) JRoach : GetAll, Kernel
+        Enable IncludeTestSrc and make Reset vector for resetting work in
+        conjunction with the test source.
+
+      (08-Nov-93) TDobson : vdudecl, vdudriver
+        Complete kernel support for DPMS.
+
+      (10-Nov-93) TDobson : source.pmf.osbyte
+        Fix bug MED-00963: INKEY(-256) now returns &A5.
+
+      (11-Nov-93) TDobson : source.vdumodes
+        Fix bug MED-?????: mode 32 now same timings as modes 29-31.
+        
+      (12-Nov-93) AGlover : source.vdugrafg
+        Fix bug MED-01112 : 32K/16M sprites not working with SpriteOp ReadPixelColour (41)
+        Fix bug MED-????? : Correct the routine which bounces palettes on new format sprites
+        
+      (13-Dec-93) BCockburn : Middle, Source.PMF.OsInit, Hdr:VickySpace
+        Inmplemented ReadSysInfo 4 to do the Ethernet address.  This meant changing
+        the reading of the 64 bit thing (in osinit) to store all of it rather than the
+        48 bit version.  Moved the 48bit trimming code the the implementation of
+        ReadSysInfo 2.
+
+---------------------------------------------------------------------------
+
+Version: 3.28 Fri 17-Dec-93        Jonathan Roach                
+
+
+      (18-Nov-93) AGlover : source.vdugrafh, source.vduswis, source.vdudriver, source.vdugrafj
+        Fix bug MED-01130 : GetMaskSpWidth was going wrong when mask exactly fitten in a word
+        Change handling of sprite type so that unknown types are handled as 32bpp - will make
+        life easier for people adding new types that the OS doesn't handle.
+
+      (23-Nov-93) AGlover : source.vdugrafg, source.vdugrafh, source.vdugrafi
+        Fix bug MED-01281 : return an error when I should for spriteops given new format
+        masks.
+        
+      (24-Nov-93) AGlover: source.vdugrafg
+        Fix bug MED-????? : sprite name matching code was being broken by changed
+        lowercase macro. Code now uses uk_lowercase which retains the original
+        behaviour of the macro keeping the sprite stuff compatible with 3.10
+
+      (25-Nov-93) TDobson: source.vdumodes
+        Fix mode definition for mode 47 (PCEm mode 360 x 480) to have sync polarity 3,
+        so it gives correct height on VGA-only monitors.
+
+      (26-Nov-93) SCormie: Source.PMF.key, Source.PMF.osinit
+        Keyboard driver and key handler now trigger each other correctly during reset.
+        Change default serial threshold from 9 to 17.
+
+      (30-Nov-93) AGlover: source.vdu23, source.vduwrch
+        Fix bug MED-01141: Split CompileTextFgBg into two separate routines and only call
+        the one actually relevant. This prevents spurious colour changes when a text colour
+        set by OS_SetColour is changed using VDU 17 or VDU 23,17 (what used to happen is
+        that because the Fore/Back Col and Tint words didn't produce the colour in use (which
+        had been modified directly by OS_SetColour) it was replacing it with whatever the
+        ForeCol and Tint produced. Note: Doing a VDU 23,17 before the first VDU 17 will still 
+        go wrong - but I don't think it's worth fixing.
+
+      (30-Nov-93) TDobson: source.vdumodes
+        Change XEigFactor for games modes 48,49 to 2 (from 1) at the request of Ran Mokady.
+
+      (01-Dec-93) TDobson: source.pmf.osword
+        Fix bug MED-00355: OS_Word(&0F) no longer requires a terminating
+        character after string (it now pushes the string on the stack and
+        terminates it, before calling the TerritoryManager).
+
+      (01-Dec-93) TDobson: NewReset
+        Fix bug MED-01513: now prints eg "RISC OS 10MB" on startup.
+
+      (02-Dec-93) TDobson: ModHand
+        Fix bug MED-01229: now uses 8 bytes of unplug CMOS for podules, + 1 for network card
+
+      (06-Dec-93) JRoach: NewReset
+        Correct mouse step default to 2 for faster mice we'll be using.
+               
+      (07-Dec-93) AGlover: source.vdugrafj, source.vdugrafk
+        Fix bug MED-?????: make sure screensave and getsprite(user) don't permit palettes
+        on sprites which it can't force back to an old screen mode
+
+      (09-Dec-93) TDobson: source.vdudriver, source.vduswis
+        Use Roger's algorithm for default XEigFactor, YEigFactor for mode selectors.
+
+      (13-Dec-93) TDobson: GetAll
+        Set AddTubeBashers flag to FALSE.
+
+      (15-Dec-93) TDobson: GetAll, NewReset
+        Set DebugROMInit and DebugROMErrors flags to FALSE.
+        Fix bug MED-01774: Change default FontSize to 64K.
+
+---------------------------------------------------------------------------
+
+Version: 3.29 Tue 21-Dec-93        Owen Love                     
+
+Changed 'Memory cannot be moved' error message.
+
+---------------------------------------------------------------------------
+
+Version: 3.30 Thu 27-Jan-94        Jonathan Roach                
+
+
+      (21-Dec-93) AGlover: arthur3
+        Fix bug MED-01583 - *eval 9999999999999 was calling msgtrans twice to return error
+          
+      (06-Jan-94) TDobson: Kernel, Source.PMF.Key, SWINaming
+        Added SWI OS_Reset - part of fix for MED-01397.
+
+      (10-Jan-94) BCockburn: Middle
+        Fixed Ethernet address generation to use the correct base
+        (&0000A4100000) value rather than the value &0000A4000000 as found
+        in the Dallas chip itself.
+
+      (10-Jan-94) TDobson: source.vdudriver, source.vduswis
+        Fixed bug MED-00563: invalid mode selector should return error from
+        mode change, not select mode 0.
+        If current monitor type is a file, now uses VGA substitute table for
+        unavailable mode numbers - eg if you select mode 16, you now get
+        mode 27, rather than mode 0.
+
+      (10-Jan-94) TDobson: source.vdudriver
+        Fixed bug MED-00483: "mode selector" not on a word boundary (eg
+        sprite mode word) is now not offered round to Service_ModeExtension,
+        so should now give error, rather than data aborts.
+
+      (12-Jan-94) JRoach: GetAll
+        Fixed bug MED-00585: configured language wasn't 10, and now is.
+
+      (13-Jan-94) TDobson: GetAll, ModHand
+        Introduced conditional flag RMTidyDoesNowt - if true (which it is on Medusa),
+        then RMTidy returns having done nothing. This is because it would always
+        fail anyway, because FSLock always refuses to die. Fixes MED-02125.
+
+      (14-Jan-94) SCormie: source.PMF.osinit
+        Changed combo chip configure sequence so that 710 configuration doesn't put
+        665 into a strange state if receiving at the same time (caused chip to generate
+        an interrupt which could not be cleared.
+
+      (14-Jan-94) JRoach: Arthur2
+        Changed GSInit/GSRead to use its stack memory as a wrapping buffer.
+        This means GSInit doesn't need to flatten it before starting which
+        means recursive calls the GSTrans work.
+
+      (17-Jan-94) TDobson: ARM600, ChangeDyn
+        Put in semaphore, so that OS_ChangeDynamicArea will fail if it is already threaded.
+        (Data abort handler clears it, in case area handler goes bang!)
+
+      (17-Jan-94) TDobson, AGlover: source.vdugrafj
+        Fixed the 21-Dec-93 fix so it assembles and hopefully works!
+
+      (18-Jan-94) TDobson: ARM600, Kernel, SWINaming
+        Added soft copy for MMU control register, and SWI OS_MMUControl to update it.
+
+      (19-Jan-94) AGlover: source.vdugrafg
+        Fix bug MED-02210 - plot mask for 1bpp masks was going wrong when plotting clipped.
+        
+      (19-Jan-94) JRoach: NewReset
+        Correct CMOS default for textured window background to match the CMOS spec.
+        (The spec says set bit 7 of &8c to 0 to turn on textured window backgrounds).
+
+      (19-Jan-94) JRoach: NewReset
+        Correct CMOS default for desktop font to '8' which is still Homerton.Medium.
+        Changed needed as Darwin has been removed and so the numbers change.
+
+      (19-Jan-94) TDobson: ARM600
+        Fixed bug MED-02452: make BangCamUpdate check if oldaddr=newaddr,
+        and don't remove page from old address if so.
+
+      (19-Jan-94) TDobson: source.vdudriver
+        Changed notional operational range for VCO to 55-110MHz (from 40-80MHz).
+
+      (21-Jan-94) TDobson: ARM600
+        Changed ROM access speed to 156.25ns (from 187.5ns)
+
+      (21-Jan-94) TDobson: source.vdudriver
+        Changed ComputeModuli to only use R-values up to 16 (not 64), to
+        improve minimum comparison frequency.
+        Change FIFO load position algorithm to use table produced by Peter
+        Watkinson.
+
+      (24-Jan-94) TDobson: GetAll, source.vdudriver, source.vduswis
+        Conditionally reversed change to XEig/YEig algorithm back to what it was
+        in 3.27.
+
+      (25-Jan-94) TDobson: source.vdudriver
+        Fixed FIFO load position table to use correct units.
+
+---------------------------------------------------------------------------
+
+Version: 3.31 Tue 08-Feb-94        Tim Dobson                    
+
+      (28-Jan-94) AGlover: syscomms, source.vdugrafj
+        Fix bug MED-01570 (syscomms), and various bugs reports involving 
+        1bpp 2 x 2 eig modes (vdugrafj: sanitizesgetmode was mishandling
+        double pixel modes)
+
+      (28-Jan-94) TDobson: source.vdumodes
+        Update kernel's hard-wired mode tables to use new VCO range.
+
+      (28-Jan-94) TDobson: TickEvents
+        Fixed bug MED-02498: OS_CallAfter/Every and OS_RemoveTickerEvent problems.
+
+      (31-Jan-94) TDobson: TickEvents
+        Fixed register corruption in above fix.
+
+      (01-Feb-94) AGlover: hdr:sprite, vdugrafdec, vdugrafj, vdugrafk, vdugrafl 
+        Fix bug MED-02160. Make switching output to, and screenloading of, a
+        256 colour 8bpp sprite work. The hdr change is because the value of 
+        MaxSpritePaletteSize has been updated.
+
+      (03-Feb-94) TDobson: ARM600, ChangeDyn, GetAll
+        Fix bugs MED-00793, MED-01846. Dynamic areas which may require
+        specific physical pages must now have a new bit set in the dynamic
+        area flags. As a result, other areas can perform large grows in one
+        chunk, rather than being split up, because it is not necessary to
+        set up the page blocks etc. Therefore a) dragging RAMFS bar is much
+        faster and b) there's no chance that intermediate reinits of RAMFS
+        can steal pages that were to be used for subsequent chunks.
+
+---------------------------------------------------------------------------
+
+Version: 3.32 Mon 14-Feb-94        Tim Dobson                    
+
+      (08-Feb-94) AGlover: source.vdugrafh
+        Fix bug MED-01885. WritePixelColour wasn't working correctly for
+        8bpp full palette sprites.
+
+      (09-Feb-94) TDobson: Messages
+        Fix part of bug MED-02389 by changing system heap full message.
+                                   
+      (10-Feb-94) AGlover: source.vdugrafh
+        More on MED-01885. AddTintToColour decides what to do by NColour, rather
+        that SprRdNColour which is correct for Write/ReadPixel in sprite.
+        Set NColour to SprRdNColour for the call and then restore it afterwards.
+        The scope of the bug was more than first thought - it affected writing to
+        any 8bpp sprite in anything other than an 8bpp screen mode.
+
+      (11-Feb-94) TDobson: NewReset
+        Limit maximum size of RAM disc to 16MB, because FileCore can't cope
+        with some larger sizes.
+
+---------------------------------------------------------------------------
+
+Version: 3.33 Tue 15-Feb-94        Tim Dobson                    
+
+      (14-Feb-94) TDobson: NewIRQs
+        Fix bug MED-02859 - Unknown IRQ code now copes with DMA IRQs.
+
+---------------------------------------------------------------------------
+      
+                           Medusa OS build
+
+===========================================================================
+
+***************************************************************************
+*                                                                         *
+*  Project: Black                                                         *
+*                                                                         *
+*  Module:  Kernel                                                        *
+*                                                                         *
+*  Created: Thu 11-Aug-94      By: Aideen McConville                      *
+*                                                                         *
+*  First version: 3.50                                                    *
+*                                                                         *
+*    Copyright:    (C) 1994, Acorn Computers Ltd., Cambridge, England.    *
+*                                                                         *
+***************************************************************************
+
+Purpose:
+========
+
+
+
+***************************************************************************
+
+
+Change Log:
+===========
+
+
+---------------------------------------------------------------------------
+
+Version: 3.50 Thu 11-Aug-94        Aideen McConville             
+
+Moved to new source tree (Identical to Version: 3.33 above).
+
+---------------------------------------------------------------------------
+
+Version: 3.51 Wed 25-May-94        Alan Glover
+
+  (28-Apr-94) AGlover: source.vdugrafj
+        Fix screenloading of 8bpp non-full palette sprites (deferred fix from Medusa
+        freeze). MED-03186
+
+  (28-Apr-94) AGlover: source.vdugrafh
+        Fix spriteop readpixel for 256 colour full palette modes (deferred fix from
+        Medusa freeze). MED-03090
+
+  (28-Apr-94) AGlover: source.vduswis
+        Fix readmodevariable returning 63 instead of 255 for a sprite mode word.
+        MED-03265
+
+  (25-May-94) AGlover: source.vdugrafg,j,k
+        Changes to allow palettes on new format sprites of 8bpp and below. Also
+        William Turner's vdugrafh,i.
+
+---------------------------------------------------------------------------
+
+Version: 3.52 Thu 11-Aug-94        Richard Manby
+
+requires Hdr:Machine.Morris (from HdrSrc 3.55)
+
+New files:  s.Morris       Contains 16/32bit ROM startup code
+Changes to: s.Kernel       Changed to conditionally Get s.Morris
+            s.ARM600       Initialisation of extra Morris registers.
+                           New RAM width and sizing code for Morris based machines.
+            TestSrc.Begin
+            s.PMF.key    } ReadCh modified for Stork's power saving scheme.
+            s.PMF.osinit } see StorkPowerSave flag.
+
+---------------------------------------------------------------------------
+
+Version: 3.53 Thu 18-Aug-94        Richard Manby                 
+
+Changes to s.Getall     Made Stork & Morris flags define as false when not
+                        required, so that OS's with no Morris support can
+                        still be built.
+
+                        Set IncludeTestSrc flag to false so that the Kernel
+                        built to test Morris stands more chance of starting up.
+
+---------------------------------------------------------------------------
+
+Version: 3.54 Wed 24-Aug-94        Steve Cormie                  
+
+Changes to s.ChangeDyn  Access privileges for soft cam map changed to make
+                        pages unavailable (source level fix for MemFix utility).
+           s.NewReset   Access privileges for system heap, level 2 page tables
+                        and soft cam map changed to make pages unavailable
+                        (source level fix for MemFix utility).
+
+---------------------------------------------------------------------------
+
+Version: 3.55 Thu 22-Sep-94        Alan Glover                   
+
+Change to s.pmf.osbyte  OS_Byte 19 returns immediately if screen is presently
+                        blanked by DPMS (ie there are no HSYncs and hence
+                        no VSyncs). Source level fix for DPMSUtils.
+                        
+---------------------------------------------------------------------------
+
+Version: 3.56 Thu 22-Sep-94        Steve Cormie                  
+
+Changes to s.Arthur3    *Configure and *Syntax starting and trailing text now
+                        looked up in Messages file.
+           s.Utility    Error reported for *RMKill UtilityModule now looked up.
+           Resources.UK.Messages        New messages added.
+
+---------------------------------------------------------------------------
+
+Version: 3.57 Mon 26-Sep-94        Steve Cormie                  
+
+Changes to s.NewIRQs            ROM patch converted to source fix; kernel does
+                                its VSYNC stuff before issuing VSYNC events.
+           s.PMF.i2cutils       ROM patch converted to source fix; put data
+                                low before clock high on stop.
+           s.vdu.vdudriver      ROM patch converted to source fix; display modes
+                                with bits/scan line multiple of 32 but not 64.
+
+---------------------------------------------------------------------------
+
+Version: 3.58 Mon 03-Oct-94        Richard Manby                 
+
+Changes to s.ARM600             Bug fix Morris RAM allocation code.
+                                Hardwiring various bits to make simulation easier.
+
+---------------------------------------------------------------------------
+
+Version: 3.59 Wed 12-Oct-94        Alan Glover                   
+
+Changes to s.pmf.osbyte         Repair my DPMSUtils fix - can't use usual workspace
+                                pointer register.
+                                Bring version file back in step with source filer
+                                version.
+
+---------------------------------------------------------------------------
+
+Version: 3.60 Fri 14-Oct-94        Richard Manby                 
+
+
+---------------------------------------------------------------------------
+
+Version: 3.61 Fri 14-Oct-94        Richard Manby                 
+
+Really the same as 3.60 - Reversed various flags that were set to make
+simulation easier.
+---------------------------------------------------------------------------
+
+Version: 3.62 Wed 19-Oct-94        Alan Glover                   
+
+Changes to s.ARM600             Introduce use of hdr:ImageSize.<ImageSize>
+           s.GetAll             Needed for ROM size and softloading.
+
+---------------------------------------------------------------------------
+
+Version: 3.63 Thu 27-Oct-94        Richard Manby
+
+Changes to s.NewIRQ   - Add extra Device IRQs for Morris PS2 mouse and AtoD.
+           s.NewReset - Set clock prescalers to divide by one.
+
+---------------------------------------------------------------------------
+
+Version: 3.64 Thu 27-Oct-94        Richard Manby                 
+
+s.NewIRQ  logged in again because SrcFiler got it wrong (corrupt files)
+s.NewReset
+
+---------------------------------------------------------------------------
+
+Version: 3.65 Fri 28-Oct-94        Richard Manby   *** MORRIS ONLY ****
+
+s.vdu.vdudriver } initial stab at getting correct video timing on Morris
+s.vdu.vdumodes  } (cos rclk is 32MHz not 24MHz).
+                  Gives wrong timing on RISC PC - will fix when I understand
+                  enough about it to do it!.
+
+---------------------------------------------------------------------------
+
+Version: 3.66 Fri 28-Oct-94        Richard Manby   *** MORRIS ONLY ****
+
+s.Morris   - Change 16 boot code to work around bugs in 1st Morris silicon.
+                        This temporary change means ROMS WON'T work on RISC PCs.
+
+---------------------------------------------------------------------------
+
+Version: 3.67 Mon 31-Oct-94        Richard Manby                 
+
+s.PMF.osinit - change kernel to default to FX 9,0 ie first flash colour
+               constantly displayed fixes fault MED-03256
+
+---------------------------------------------------------------------------
+
+Version: 3.68 Mon 31-Oct-94        WTurner                       
+
+s.PMF.osinit - Changes to support monitor id on Morris machines.
+
+Also contains updated hdr.KernelWS (CLine_Softcopy for Morris monitor id)
+
+---------------------------------------------------------------------------
+
+Version: 3.69 Mon 31-Oct-94        Aideen McConville             
+
+* s.PMF.osinit - Corrected some keyslips (LDRBNE -> LDRNEB)
+* s.Version    - updated from 3.32 !!!
+
+---------------------------------------------------------------------------
+
+Version: 3.70 Mon 31-Oct-94        Steve Cormie                  
+
+* s.Utility, s.SysComms - Changes to *Help handlers so that the Kernel message
+                          file is used in preference to the Global message file.
+* Resources.UK.Messages - Moved command help/syntax from Global message file to
+                          Kernel message file. Added directives for message
+                          tokenisation.
+
+---------------------------------------------------------------------------
+
+Version: 3.71 Tue 01-Nov-94        Richard Manby                 
+
+s.pmf.osinit } Extend ReadSysInfo(2) to indicate VIDC20 and IOMD variants
+s.middle     } used in Morris.
+---------------------------------------------------------------------------
+
+Version: 3.72 Wed 02-Nov-94        Richard Manby                 
+
+s.vdu.vdudriver } Rework mode change code to cope with different rclk values
+s.vdu.vdumodes  } (cos rclk is 32MHz on Morris and 24MHz on RISC PC).
+
+---------------------------------------------------------------------------
+
+Version: 3.73 Thu 03-Nov-94        Steve Cormie                  
+
+* s.NewReset - Set Boot$Error if FSControl_BootupFS returns an error.
+
+---------------------------------------------------------------------------
+
+Version: 3.74 Thu 03-Nov-94        Aideen McConville             
+
+* Export ScreenBlankFlag and ScreenBlankDPMSState so that DPMSUtils can
+  still be built (part of RISC OS 3.50 and 3.60)
+
+  Changed files: hdr.KernelWS
+                 hdr.PublicWS
+---------------------------------------------------------------------------
+
+Version: 3.75 Fri 04-Nov-94        Richard Manby                 
+
+Switch the POST code in to see if it works.
+
+---------------------------------------------------------------------------
+
+Version: 3.76 Mon 07-Nov-94        Richard Manby                 
+
+Switch the POST code off because it doesn't work on Morris.
+
+---------------------------------------------------------------------------
+
+Version: 3.77 Wed 09-Nov-94        Richard Manby                 
+
+ARM600 change to MemSize to merge ram fragments.
+
+---------------------------------------------------------------------------
+
+Version: 3.78 Wed 09-Nov-94        Richard Manby                 
+
+Fix the MemSize changes
+
+---------------------------------------------------------------------------
+
+Version: 3.79 Wed 09-Nov-94        Richard Manby                 
+
+Third time lucky!.
+
+---------------------------------------------------------------------------
+
+Version: 3.80 Thu 10-Nov-94        Richard Manby                 
+
+Fixed a source corruption of s.pmf.osinit that stopped system clock
+(ie OS_Word 1 clock) from working.
+
+---------------------------------------------------------------------------
+
+Version: 3.81 Wed 16-Nov-94        Steve Cormie                  
+
+* s.SysComms - Forgot to make the SysComms module header point to the Kernel
+               Messages file for command help/syntax.
+
+---------------------------------------------------------------------------
+
+Version: 3.82 Thu 17-Nov-94        Steve Cormie                  
+
+* Resources.UK.Messages - No longer tokenise kernel messages, just help/syntax.
+
+---------------------------------------------------------------------------
+
+Version: 3.83 Mon 21-Nov-94        Richard Manby                 
+
+* s.Morris
+* testsrc.Begin     } rework POST code for Morris
+* testsrc.Mem1IOMD  }
+* testsrc.Ioc       }
+* testsrc.Vidc      }
+Switch the POST code on because it now works on Morris.
+
+---------------------------------------------------------------------------
+
+Version: 3.84 Mon 21-Nov-94        Richard Manby                 
+
+* s.KbdResPC enable Mouse port interrupts so Kernel sees a Keyboard when
+             mouse and keyboard are swapped over.
+
+---------------------------------------------------------------------------
+
+Version: 3.85 Wed 23-Nov-94        Richard Manby                 
+
+s.Arm600 change the ROM speed for Morris to fast burst mode.
+
+---------------------------------------------------------------------------
+
+Version: 3.86 Wed 30-Nov-94        Steve Cormie                  
+
+* s.ARM600 - Fixed MED-03854, enable MMUC_F bit in MMU control register by
+  default (actually ARM700 specific so that coprocessors run at FCLK speed,
+  has no effect on 6xx processors).
+
+---------------------------------------------------------------------------
+
+Version: 3.87 Thu 01-Dec-94        Richard Manby                 
+
+* TestSrc.Begin - Fixed MED-03956, On Morris, change clock dividers and ROM
+  access speed from power-on defaults (ie slow) to sensible values.
+
+* s.PMF.osinit add Stork detection to Kernel.
+
+---------------------------------------------------------------------------
+
+Version: 3.88 Fri 02-Dec-94        Richard Manby                 
+
+* s.MemInfo - Changed OS_Memory 7 and OS_Memory 8 to return new larger
+  4MByte ROM size.
+
+---------------------------------------------------------------------------
+
+Version: 3.89 Tue 06-Dec-94        Steve Cormie                  
+
+* s.Utility - Fixed MED-03685: Fixed bugs in OneModuleK where if the total
+  length of all commands exceeded the buffer size (512 bytes claimed from
+  stack) then the stack was corrupted.
+* s.Arthur3 - Fixed MED-04034: New lines required after *Status and *Configure
+  title strings.
+
+---------------------------------------------------------------------------
+
+Version: 3.90 Wed 07-Dec-94        Steve Cormie                  
+
+* s.Utility - Oops, fixed the fix in version 3.89.
+
+---------------------------------------------------------------------------
+
+Version: 3.91 Mon 12-Dec-94        Steve Cormie                  
+
+* s.ModHand - Added 6 more bytes for unplugging modules.
+
+---------------------------------------------------------------------------
+
+Version: 3.92 Thu 15-Dec-94        Alan Glover                   
+
+* s.vdu.vdugrafh - this oops lark is contagious. Really do the changes I
+  claimed for 3.51 to fix MED-03090. They got lost when I merged three
+  sources together.
+  
+---------------------------------------------------------------------------
+
+Version: 3.93 Mon 19-Dec-94        Richard Manby                 
+
+* s.ChangeDyn - put a fix in code for shrinking doubly mapped dynamic areas.
+
+---------------------------------------------------------------------------
+
+Version: 3.94 Wed 21-Dec-94        Richard Manby                 
+
+* POST code bug fix in SoundIRQ test shown up by version 2 Morris chips.
+
+---------------------------------------------------------------------------
+
+Version: 3.95 Mon 09-Jan-95        Steve Cormie                  
+
+* s.NewReset - CMOS clearing code skipped 2 bytes after YearCMOS now used for
+  unplugging ROM modules (used to be MonthCMOS and YearCMOS, only used for
+  A500s).
+
+---------------------------------------------------------------------------
+
+Version: 3.96 Thu 12-Jan-95        Graham Simms                  
+
+* s.vdu.vdugrafi - Fixed MED-04130. The SpriteOp 'Flip about x axis' was creating
+  New format sprites with LH wastage in both the mask and sprite data when a new
+  format sprite with RH wastage was flipped.
+  
+---------------------------------------------------------------------------
+
+Version: 3.97 Thu 12-Jan-95        Richard Manby                 
+
+* s.NewReset - Fixed MED-04318 year defaults to 1995 onwards
+
+---------------------------------------------------------------------------
+
+Version: 3.98 Thu 19-Jan-95        Steve Cormie                  
+
+* s.Kernel - Fixed MED-04367: R9 was being corrupted by ExtensionSWI handler
+  before calling the module SWI handler (PRM says that R0-R9 are passed from
+  the SWI caller). This has been broken for a long time (it is also present
+  in RISC OS 3.11 and possibly earlier).
+
+---------------------------------------------------------------------------
+
+Version: 3.99 Fri 20-Jan-95        Alan Glover                   
+
+* s.vdu.vdugrafe, s.vdu.vdugrafdec, s.getall, hdr.kernelws - Fix MED-00001:
+  Flood fill now attempts to use rma, and use two-word entries in the queue
+  allowing it to overcome the old 1024 line limit.
+* s.getall, s.morris - add warning messages when switch settings indicate
+  a version is being built that can't be tested by soft-loading on a RiscPC
+  (guess who fell for it!).
+* s.getall, hdr.kernelws - Add Audit trial debugging for MED-00001: this should
+  be turned off (med_00001_debug) in s.getall once the fix has been tested
+* hdr.riscos - change a character in a comment which objasm was sulking about    
+
+---------------------------------------------------------------------------
+
+Version: 4.00 Fri 27-Jan-95        Richard Manby                 
+
+* Kernel.s.PMF.osbyte changed INKEY-256 value from &A5 to &A6
+  MED-04451
+
+---------------------------------------------------------------------------
+
+Version: 4.01 Wed 01-Feb-95        Richard Manby                 
+
+* Kernel.s.NewIRQs changed default IRQ2V handler to cope with unclaimed
+  interrupts from IRQ D (new for Morris), ie PS2 mouse port interrupts.
+
+  Fixes MED-04355
+
+---------------------------------------------------------------------------
+
+Version: 4.02 Wed 01-Feb-95        Steve Cormie                  
+
+* Fixed MED-04483: Message "NumParm" should have remained in the
+  Global.Messages file.
+
+---------------------------------------------------------------------------
+
+Version: 4.03 Mon 06-Feb-95        Steve Cormie                  
+
+* hdr.KernelWS, hdr.PublicWS, s.ChangeDyn - Fixed MED-04443 (hopefully!),
+  SVC stack increased in size to 12K.
+
+---------------------------------------------------------------------------
+
+Version: 4.04 Mon 06-Feb-95        Richard Manby                 
+
+* s.ModHand Fixed MED-04173. *Unplug now checks to see whether a module is
+  active before killing it.
+
+---------------------------------------------------------------------------
+
+Version: 4.05 Tue 07-Feb-95        Steve Cormie                  
+
+* hdr.KernelWS, hdr.PublicWS - Removed the change made in version 4.03.
+  SVC stack size moved back to 8K as changing it makes other modules
+  eg. FileSwitch, no longer work on older operating systems.
+
+---------------------------------------------------------------------------
+
+Version: 4.06 Tue 07-Feb-95        Richard Manby                 
+
+* s.PMF.osinit
+
+Optimisation: New routine Configure37C665 used instead of Configure82C710.
+Since all the machines that Black is targetted for use the SMC 665, there is
+no point assembling code that can cope the 82C710/82C711 as well.
+
+For Stork: Added code to initialise various PowerControl latches so that
+the machine powers up to a sensible state and will function (sort of) if
+the portable module is unplugged.
+
+---------------------------------------------------------------------------
+
+Version: 4.07 Wed 08-Feb-95        Steve Cormie                  
+
+* s.Arthur2 - Fixed MED-04528: OS_SetVarVal code was looking up the error
+  "String not recognised" (returned from OS_GSRead) when it did not need to.
+
+---------------------------------------------------------------------------
+
+Version: 4.08 Mon 13-Feb-95        Steve Cormie                  
+
+* Fixed MED-03651: Changed default Econet protection mask on CMOS reset.
+
+---------------------------------------------------------------------------
+
+Version: 4.09 Wed 15-Feb-95        Steve Cormie                  
+
+* hdr.KernelWS - Part of fix for MED-04611: Added CLibCounter for use by
+  Shared C Library tmpnam function.
+
+---------------------------------------------------------------------------
+
+Version: 4.10 Wed 15-Feb-95        Richard Manby                 
+
+* s.GetAll } Conditionally changed the RISC PC ROM speed setting code
+* s.ARM600 } to set burst mode ROM access. See flag RISCPCBurstMode.
+             If false, this will generate non-burst mode code as used
+             by all earlier versions.
+
+---------------------------------------------------------------------------
+
+Version: 4.11 Thu 16-Feb-95        Richard Manby                 
+
+* s.Kernel Fixed stack inbalance in SWI despatch code - Pull "R9" 
+executed prior to entering modules made conditional on actually calling
+the code, as if code is not called, we drop into VectorUserSWI code
+which also pulls R9. Fixes MED-04655.
+
+---------------------------------------------------------------------------
+
+Version: 4.12 Tue 28-Feb-95        Richard Manby                 
+
+* s.ARM600 Amount of space allowed for screen limited to 16MByte (as
+requested by Tim Dobson).
+
+---------------------------------------------------------------------------
+
+Version: 4.13 Wed 01-Mar-95        Richard Manby                 
+
+* s.ARM600 Code added to check processor type before setting burst mode on
+a RISC PC. If processor type is ARM710, burst mode cannot be used.
+Any other processor, ie ARM610, ARM710A etc uses burst mode.
+NB This has no effect on Morris which uses seperate code.
+
+* s.Morris - altered conditional to switch proper Morris start code in as the
+default, rather than the code for early damaged Morris'.
+
+---------------------------------------------------------------------------
+
+Version: 4.14 Wed 01-Mar-95        Richard Manby                 
+
+* s.GetAll Flag RISCPCBurstMode set true.
+
+
+---------------------------------------------------------------------------
+
+Version: 4.15 Thu 02-Mar-95        Aideen McConville             
+
+* s.GetAll Flag RISCPCBurstMode set false.
+
+---------------------------------------------------------------------------
+
+Version: 4.16 Mon 06-Mar-95        Richard Manby                 
+
+* s.ARM600 zeroed VRAMSize for Morris based machines - fixes DForths bug MED-?????
+  also, after inspection of RPC code, initialised IOMD_VIDEND.
+
+---------------------------------------------------------------------------
+
+Version: 4.17 Tue 07-Mar-95        Alan Glover                   
+
+* s.GetAll: Turn off the MED-00001 audit trail flag.
+
+---------------------------------------------------------------------------
+
+Version: 4.18 Wed 08-Mar-95        Richard Manby                 
+
+* s.ARM600 In Morris specific IOMD register initialisation code - VIDMUX
+  register set for 'Japanese' format sound DAC's, cos Kryten and Stork
+  both now have 16 sound.
+
+* s.NewReset CMOS RAM reset code now sets 16bit sound for all Morris based
+  machines and RISC PC's that look like Sugar/Rimmer. Normal RISC PCs set
+  for 8bit sound.
+
+  Above two changes fix MED-04831 and MED-04646.
+
+* s.os.osinit Fixed Stork detection code.
+
+
+---------------------------------------------------------------------------
+
+Version: 4.19 Wed 08-Mar-95        Richard Manby                 
+
+* s.NewReset Fix Sugar/Rimmer detector (change some LDRB's to LDR's).
+
+---------------------------------------------------------------------------
+
+Version: 4.20 Fri 10-Mar-95        Steve Cormie                  
+
+* s.Kernel, s.GetAll: Conditioned out fix for R9 corruption in ExtensionSWI
+  handler (conditional on FixR9CorruptionInExtensionSWI) because CC's
+  !SpellMod and possibly others rely on broken behaviour.
+* s.NewReset: Added default CMOS configuration for CDROMFSCMOS.
+
+---------------------------------------------------------------------------
+
+Version: 4.21 Mon 13-Mar-95        Aideen McConville             
+
+* Version set to 3.60 (13-Mar-95) for external release.
+
+---------------------------------------------------------------------------
+
+Version: 4.22 Wed 15-Mar-95        Aideen McConville             
+
+* Version set to 3.60 (15-Mar-95) to differentiate changed release.
+
+  Changed modules:
+    Free      (0.30) - new version
+    FileCore  (2.89) - new version
+    ADFS      (3.12) - new version
+    ADFSFiler (0.83) - rebuilt with new Hdr:FileCore
+    RAMFS     (2.11) - rebuilt with new Hdr:FileCore
+
+---------------------------------------------------------------------------
+
+Version: 4.23 Mon 20-Mar-95        Aideen McConville             
+
+* Version set to 3.60 (20-Mar-95) to differentiate changed release.
+
+  Changed modules:
+    ColourPicker (0.35) - rebuilt with Lib.Support (0.10) - MED-04986
+    DrawFile     (1.46) - rebuilt with Lib.Support (0.10) - no functional change
+    BootCmds     (1.14) - rebuilt with Lib.Support (0.10) - no functional change
+    SpriteExtend (0.98) - MED-05018
+    Internet     (4.02)
+    Freeway      (0.22)
+    ShareFS      (2.34)
+
+---------------------------------------------------------------------------
+
+Version: 4.24 Wed 22-Mar-95        Aideen McConville             
+
+* Version set to 3.60 (22-Mar-95) to differentiate changed release.
+
+  Changed modules:
+    ColourPicker (0.36) - MED-04985 (built with Lib.Support 0.11)
+    ATAPI        (1.21)
+    Freeway      (0.23)
+
+---------------------------------------------------------------------------
+
+Version: 4.25 Fri 24-Mar-95        Aideen McConville             
+
+* Version set to 3.60 (24-Mar-95) to differentiate changed release.
+
+  Changed modules:
+    ADFS         (3.13) - MED-05030
+    ATAPI        (1.22)
+    CDFSFiler    (2.39) - MED-04687
+    PS2Driver    (0.14) - MED-04434, MED-04838
+
+---------------------------------------------------------------------------
+
+Version: 4.27 Tue 04-Apr-95        Aideen McConville             
+
+* Version set to 3.60 (31-Mar-95) to differentiate changed release.
+
+  Changed modules:
+    ATAPI        (1.23)
+    FileCore     (2.91)
+    SpriteExtend (0.99)
+    !Printers    (1.46)
+    Toolbox      (1.36)
+    Internet     (4.03)
+    Freeway      (0.24)
+
+---------------------------------------------------------------------------
+
+Version: 4.28 Thu 13-Apr-95        Aideen McConville             
+
+* Version set to 3.60 (13-Apr-95) to differentiate changed release.
+
+  Changed modules:
+    CDFSFiler    (2.40)
+    PDModules    (4.35) - PDriverPS, PDriverDP
\ No newline at end of file