osbyte 37.5 KB
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; Copyright 1996 Acorn Computers Ltd
;
; Licensed under the Apache License, Version 2.0 (the "License");
; you may not use this file except in compliance with the License.
; You may obtain a copy of the License at
;
;     http://www.apache.org/licenses/LICENSE-2.0
;
; Unless required by applicable law or agreed to in writing, software
; distributed under the License is distributed on an "AS IS" BASIS,
; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
; See the License for the specific language governing permissions and
; limitations under the License.
;
; > $.Source.PMF.osbyte
; New version of OSBYTE which claims the ByteV(ector) properly
; PMF 18/9/86
; Updates:
; Kernel
; Version  Date        Who  Why
; 2.01     15-June-90  JSR  Change OS_Byte 124/125/126 to update the CallBack_Flag byte
;                            correctly, rather than setting it to 1. The bug caused vector
;                            callbacks to be delayed over much when escape was pressed.
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; ????     08-Feb-95   WT   Change OS_Byte 106 to support the new cursor storage method
;                            introduced for Stork LCD support.
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OsbyteLowLimit * &6A    ; osbytes lower than this get Y set to 0
OsbyteVeryLow  * &1A    ; osbytes lower than this are all recognised
OsbyteSetCountry * &46
OsbyteSetAlphKey * &47
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OsbyteKeyStatus * &CA   ; only OS_Byte variable which isn't pure any more!
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; *****************************************************************************

        MACRO
        MyOsbyte $cond
        B$cond  GoMyOsbyte
        MEND

        MACRO
        MyOsWord $cond
        B$cond  GoMyOsword
        MEND

        MACRO
        Unused  $cond
        MOV$cond PC, R14 ; just return and let the next person have a go
        MEND

        MACRO
        ByteReturnV $cond
        ASSERT  "$cond"="" :LOR: "$cond"="VS"

        [ "$cond"=""
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        Pull    "R0,R3,R14,PC", VC
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        ]
        ADDVS   R13, R13, #4                    ; junk stacked R0
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        Pull    "R3,R14,PC", VS
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        MEND

; Main OSbyte entry point
; R0,R1,R2 are parameters

OsByte
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        Push    "R0, R3, R14"
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        BL      OsByteGo                        ; Call the subsid entry pt.
        Pull    "R0,R3"
        Push    "R0-R4"
        LDMIA   R13, {R2-R4}                    ; R2=A, R3=X, R4=Y
        MOV     R1, #Service_UKByte             ; osbyte service reason
        IssueService
        TEQ     R1, #0
        STMEQIA R13, {R2-R4}                    ; if claimed, then update
                                                ; returned R0-R2
        CLRPSR  V_bit, R3                       ; clear V flag

        Pull    R0
        ADRNE   R0, BadCommandError             ; not claimed, R0 -> error
      [ International
        BLNE    TranslateError
      ]
        SWINE   XOS_GenerateError               ; set V if not claimed
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        Pull    "R1-R4, R14, PC"
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BadCommandError MakeErrorBlock BadCommand

GoMyOsbyte
        CLRPSR  V_bit, R3
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        Pull    "R0,R3, R14,PC"           ; pull the world AND the PC to return
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; *****************************************************************************

OsByteGo ROUT
        AND     R0, R0, #&FF            ; no funny business!
        SUBS    R3, R0, #OsbyteLowLimit ; is it a low one ?
        BCS     HiOsbyte
        MOV     R2, #0                  ; lo one, so set Y to 0
        CMP     R0, #OsbyteVeryLow      ; is it one we recognise ?
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        ADDCC   PC, PC, R0, LSL #2      ; then go thru despatch table
        B       TryInternational        ; else issue unknown osbyte service
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        ASSERT  %BT20-%BT10 = 8

        BAL     Osbyte00
        BAL     Osbyte01
        BAL     Osbyte02
        BAL     Osbyte03
        BAL     Osbyte04
        BAL     Osbyte05
        BAL     Osbyte06
        BAL     Osbyte07

        BAL     Osbyte08
        BAL     Osbyte09
        BAL     Osbyte0A
        BAL     Osbyte0B
        BAL     Osbyte0C
        BAL     Osbyte0D
        BAL     Osbyte0E
        BAL     Osbyte0F

        BAL     Osbyte10
        BAL     Osbyte11
        BAL     Osbyte12
        BAL     Osbyte13
        BAL     Osbyte14
        BAL     Osbyte15
        BAL     Osbyte16
        BAL     Osbyte17

        BAL     Osbyte18
        BAL     Osbyte19

HiOsbyte
        CMP     R0, #MainVars           ; is it a variable ?
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        ADDCC   PC, PC, R3, LSL #2
        B       DoOsbyteVar             ; yes, then do variable mangling
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        ASSERT  %BT40-%BT30=8

        BAL     Osbyte6A
        BAL     Osbyte6B
        BAL     Osbyte6C
        BAL     Osbyte6D
        BAL     Osbyte6E
        BAL     Osbyte6F

        BAL     Osbyte70
        BAL     Osbyte71
        BAL     Osbyte72
        BAL     Osbyte73
        BAL     Osbyte74
        BAL     Osbyte75
        BAL     Osbyte76
        BAL     Osbyte77

        BAL     Osbyte78
        BAL     Osbyte79
        BAL     Osbyte7A
        BAL     Osbyte7B
        BAL     Osbyte7C
        BAL     Osbyte7D
        BAL     Osbyte7E
        BAL     Osbyte7F

        BAL     Osbyte80
        BAL     Osbyte81
        BAL     Osbyte82
        BAL     Osbyte83
        BAL     Osbyte84
        BAL     Osbyte85
        BAL     Osbyte86
        BAL     Osbyte87

        BAL     Osbyte88
        BAL     Osbyte89
        BAL     Osbyte8A
        BAL     Osbyte8B
        BAL     Osbyte8C
        BAL     Osbyte8D
        BAL     Osbyte8E
        BAL     Osbyte8F

        BAL     Osbyte90
        BAL     Osbyte91
        BAL     Osbyte92
        BAL     Osbyte93
        BAL     Osbyte94
        BAL     Osbyte95
        BAL     Osbyte96
        BAL     Osbyte97

        BAL     Osbyte98
        BAL     Osbyte99
        BAL     Osbyte9A
        BAL     Osbyte9B
        BAL     Osbyte9C
        BAL     Osbyte9D
        BAL     Osbyte9E
        BAL     Osbyte9F

        BAL     OsbyteA0
        BAL     OsbyteA1
        BAL     OsbyteA2
        BAL     OsbyteA3
        BAL     OsbyteA4
        BAL     OsbyteA5

TryInternational                        ; special ones in the middle
        TEQ     R0, #OsbyteSetCountry
        BEQ     DoOsbyteSetCountry
        TEQ     R0, #OsbyteSetAlphKey
        BEQ     DoOsbyteSetAlphKey
        MOV     PC, R14

; *****************************************************************************

; The Osbyte routines themselves


; Mos version number and title string
; R1 = 0 -> give an error with and string MosTitle
; R1 <>0 -> RETURN with R1 = MosVer

; R2 is Preserved

Osbyte00 ROUT
        TEQ     R1, #0
        MOVNE   R1, #MosVer
        MyOsbyte NE
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      [ UseNewFX0Error
        LDR     R0, =NewFX0Error
        LDR     LR, [R0]
        CMP     LR, #0
        ADREQ   R0, FX0Error ; Fall back to hardcoded string if new one isn't ready yet
      |
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        ADR     R0, FX0Error
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      ]
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        SWI     XOS_GenerateError
        ByteReturnV

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      [ UseNewFX0Error
InitNewFX0Error ROUT
        Push    "r0-r4,lr"
        MOV     r0, #0
        BL      ExtendedROMFooter_FindTag
        CMP     r0, #0
        BEQ     %FT10
        MOV     r1, r0
        MOV     r0, #-1
        LDR     r2, =NewFX0Error+4
        MOV     r3, #?NewFX0Error - 4
        ADR     r4, NewFX0ErrorFormat
        SWI     XTerritory_ConvertDateAndTime
        ; Fill in error number on success
        LDRVC   r2, =NewFX0Error
        MOVVC   r3, #&7F
        STRVC   r3, [r2]
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        Pull    "r0-r4,pc"
      ]

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FX0Error
        &       &F7
        =       "$MosTitle",0
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      [ UseNewFX0Error
NewFX0ErrorFormat
        =       "$SystemName $VString (%dy %m3 %ce%yr)",0
      ]
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        ALIGN

; *****************************************************************************

; Write User Flag
Osbyte01
V2B156
        ADD     R0, R0, #&F0            ; convert 1,5,6 to &F1,&F5,&F6
        B       DoOsbyteVar

; Select input stream
Osbyte02 ROUT
        AND     R0, R1, #1              ; new buffer id
        TEQ     R1, #0                  ; 0 => disable RXI
        Push    "r0"
        BNE     %FT10                   ; [enabling serial]

; disable serial by closing stream

        LDRB    r1, SerialInHandle
        TEQ     r1, #0
        MOVNE   r0, #0                  ; close file if handle non-zero
        STRNEB  r0, SerialInHandle      ; zero handle first
        SWINE   XOS_Find
        B       %FT20

; enable serial by opening stream

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        LDRB    r0, SerialInHandle
        TEQ     r0, #0                  ; if a stream open already
        BNE     %FT20                   ; then skip

        MOV     r0, #open_read + open_mustopen
        ADR     r1, SerialInFilename    ; open serial stream for input
        SWI     XOS_Find
        STRVCB  r0, SerialInHandle      ; if did open then store handle
                                        ; (may store same value if already open, but who cares?)
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        Pull    "r0"
        LDRB    R1, InputStream         ; old input stream
        STRB    R0, InputStream
        MyOsbyte

        LTORG

SerialInFilename
        =       "Serial#Buffer1:", 0
        ALIGN

; Select output stream
Osbyte03

Osbyte04                                ; select cursor keys actions
V2B34
        ADD     R0, R0, #&E9            ; convert 3,4 to &EC,&ED
        B       DoOsbyteVar

; Write Printer driver type
Osbyte05 ROUT
        BL      MakePrinterDormant      ; for netprint
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        SavePSR R14                     ; for restoring I afterwards
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        CLRPSR  I_bit, R3
 [ StrongARM
        NOP
        NOP
        NOP
        NOP
        NOP
 ]
        RestPSR R14                     ; restore old I
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        MOV     R3, #0
        LDRB    R3, [R3, #ESC_Status]
        TST     R3, #&40
        MyOsbyte NE                     ; ESCAPE, so don't change

        LDR     R3, PrinterActive
        TEQ     R3, #0
        BNE     %BT10                   ; still active, then loop

; insert code here to notify UPTVEC of change

        B       V2B156                  ; R0 = 5, update variable

; Write Printer Ignore Character
Osbyte06
        STRB    R2, NoIgnore            ; (R2=0) allow chars to be ignored
        B       V2B156

; Write RS423 receive rate
; Write RS432 transmit rate
Osbyte07
Osbyte08
        SUB     r0, r0, #2              ; 7 -> 5; 8 -> 6
        SWI     XOS_SerialOp
        MyOsbyte

; Write First Flash Time
Osbyte09
        MOV     R2, #1
; and drop thru to ...

; Write Second Flash Time
Osbyte0A                                        ; (R2=0)
Osbyte910
        MOV     R0, R1                          ; new period
        LDRB    R1, [R2, #OsbyteVars + :INDEX: SpacPeriod] ; get old state
        STRB    R0, [R2, #OsbyteVars + :INDEX: SpacPeriod] ; store new

        LDRB    R3, FlashCount
        TEQ     R3, #0                          ; are we frozen ?
        MyOsbyte NE                             ; no, then finish

        STRB    R0, FlashCount                  ; kick the counter
        STRB    R2, FlashState                  ; force new state

        VDWS    WsPtr

        TEQ     R2, #0
        BEQ     ForceSecondState

        Push    "R1,R2"
        BL      DoFirstFlash
        Pull    "R1,R2"
        MyOsbyte

ForceSecondState
        Push    "R1,R2"
        BL      DoSecondFlash
        Pull    "R1,R2"
        MyOsbyte


; Write Keyboard Delay
Osbyte0B
V2BBC
        ADD     R0, R0, #(&C4-&0B)
        B       DoOsbyteVar

; Write Keyboard Rate
Osbyte0C
        TEQ     R1, #0
        BNE     V2BBC
        CLRPSR  I_bit, R0       ; this may take some time
        BL      ReadKeyDefaults
        MyOsbyte

; *****************************************************************************

; Disable / Enable Events
; R1 = Event number. Decrement/Increment semaphore for this event

Osbyte0D ROUT
Osbyte0E ROUT
        CMP     R1, #32                 ; if illegal event number
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        MOVCS   R2, #&FF                ; then return + say was enabled
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        BCS     %FT10

        ADD     R3, WsPtr, #:INDEX: EventSemaphores
        LDRB    R2, [R3, R1]            ; get semaphore for this event

        CMP     R0, #13                 ; 13 => disable, 14 => enable
        SUBEQ   R0, R2, #1              ; decrement semaphore
        ADDNE   R0, R2, #1              ; increment semaphore

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        CMP     R2, #&FF                ; Z=1 => already saturated, so don't store back
        STRNEB  R0, [R3, R1]
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        MOV     R1, R2                  ; R1 = R2 = old semaphore
        MyOsbyte

; *****************************************************************************

; Flush Buffer
Osbyte0F ROUT
        TEQ     R1, #0
        BNE     FlushInput
        BL      FlushAll
        MyOsbyte

; flush all buffers

FlushAll
        Push    R14
        MOV     R1, #(NBuffers-1)
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        BL      FlushThis
        SUBS    R1, R1, #1
        BPL     %BT10
        Pull    PC

; flush input buffer

FlushInput
        LDROSB  R1, InputStream         ; get buffer id of input stream
        BL      FlushThis
        MyOsbyte

; *****************************************************************************

; Clear out the softkeys
Osbyte12 ROUT
        MOV     R0, #0
        STRB    R0, SoftKeyLen          ; purge current expansion
        MOV     R11, #KeyWorkSpace      ; can corrupt R11
        Push    R4
        MOV     R1, #15
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        MOV     R3, R1
        BL      SetupKeyName            ; exits with R0 -> SoftKeyName
        MOV     R2, #-1                 ; destroy variable
        MOV     R3, #0                  ; context pointer 0
        MOV     R4, #0                  ; type irrelevant
        SWI     XOS_SetVarVal           ; V will be set if not present
        SUBS    R1, R1, #1
        BPL     %BT10
        Pull    R4
        MyOsbyte

; *****************************************************************************

; Wait for Vsync

Osbyte13 ROUT

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        MRS     R3, CPSR                ; Interrupts disabled at the moment
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        ; bug fix for MED-03165. Having a DPMS-blanked screen stopped printing.
        ; The reason is that HSyncs stop and VSyncs stop as a consequence,
        ; but the Hourglass module uses this call to wait for the next VSync
        ; before animating the hourglass.
        ; When the screen is DPMS-blanked this osbyte will now return
        ; immediately. This is equivalent to the operation of the DPMSUtils
        ; module shipped with OS 3.50.

        VDWS    R2

        LDRB    R0, [R2,#ScreenBlankFlag]
        LDRB    R1, [R2,#ScreenBlankDPMSState]

        TEQ     R0, #0                  ; NE => blanked
        TSTNE   R1, #1                  ; NE => blanked and DPMS turned off HSyncs
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        MyOsbyte NE                     ; if true exit immediately
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        LDRB    R2, CFStime
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        BIC     R1, R3, #I32_bit
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        MSR     CPSR_c, R1              ; CLI
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   ;StrongARM core will not see interrupt unless disable is cleared for at least 5 cycles,
   ;in order to fill synchroniser pipe
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 [ StrongARM
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        NOP
        NOP
        NOP
        NOP
        NOP
 ]
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        MSR     CPSR_c, R3              ; SEI
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        LDRB    R1, CFStime
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        TEQ     R1, R2
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        MyOsbyte NE

 [ StorkPowerSave
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; It is actually better to call Idle with interrupts disabled as it stops the interrupt
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; going off on the way through the SWI dispatch and accidentally waiting for the next
; interrupt... The Idle will return when an interrupt is pending - it will be handled when
; we branch back up and enable interrupts.
        MOV     R0, #0
        LDRB    R0, [R0, #PortableFlags]
        TST     R0, #PortableFeature_Idle
        SWINE   XPortable_Idle
 ]
        B       %BT10
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; *****************************************************************************

; Restore font definitions
Osbyte14
        MOV     R1, #1                  ; start at character 1*32
        MOV     R2, #3                  ; do 3 pages
        B       ResetPartFont

; *****************************************************************************

; Flush Selected Buffer
Osbyte15        ROUT
;
; TMD 24-Apr-92: Don't check buffer number, as this prevents the flushing
; of buffer manager buffers.
;
;        CMP     R1, #NBuffers
;        BCS     %FT10                   ; invalid buffer number
        BL      FlushThis
;10
        MyOsbyte


FlushThis

; code inserted here to zero PrinterActive iff you are flushing the printer
; buffer and the print destination is not a stream one

        CMP     R1, #Buff_RS423Out      ; is it an input buffer ? (not mouse)
        BCS     %FT20                   ; no, then branch

        MOV     R0, #0
        STRB    R0, SoftKeyLen          ; kill soft key expansion
        STRB    R0, VDUqueueItems       ; flush VDU queue
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        SETV                            ; indicate purge not count
        B       CnpEntry

; Reset Group of font definitions
Osbyte19 ROUT
        CMP     R1, #8
        MyOsbyte CS                     ; not in range 0..7, ignore
        TEQ     R1, #0

        MOVEQ   R1, #1                  ; if 0 then start at 1*32, do 7 pages
        MOVEQ   R2, #7

        MOVNE   R2, #1                  ; else start at n*32, do 1 page
ResetPartFont

; first offer to International module

        Push    "R1, R2, R4, R5"
        MOV     R4, R1, LSL #5          ; R4 = start character
        ADD     R5, R4, R2, LSL #5      ; R5 = end character+1
        SUB     R5, R5, #1              ; R5 = end character
        LDRB    R3, Alphabet
        MOV     R2, #Inter_Define
        BL      OfferInternationalService
        Pull    "R1, R2, R4, R5"
        MyOsbyte EQ                     ; if claimed, don't use hard font

        ByteToNosbod DoResetFont
        MyOsbyte

; *****************************************************************************

; Set country number
; in:   R1 = country number

DoOsbyteSetCountry ROUT
        TEQ     R1, #&7F                ; if 127, just read country
        LDREQB  R1, Country
        MyOsbyte EQ

        BL      GetCountry
        Push    R4
        BL      ConvertCNoToANo         ; convert country no. to alphabet no.
        Pull    R4, NE
        MOVNE   R1, #0                  ; if not claimed, return with X=0
        MyOsbyte NE

; was claimed, so have country number in R1 and R3, alphabet no. in R4

        LDRB    R1, Country             ; save old country
        STRB    R3, Country             ; store new country
        STRB    R4, Alphabet            ; and new alphabet
        BL      NewKeyboard             ; R3=new keyboard, R4=alphabet for it
        BL      SetAlphabet
        Pull    R4
        MyOsbyte

SetAlphabet
        Push    "R1,R5,R14"
        MOV     R2, #Inter_Define       ; now redefine the chars
        MOV     R3, R4
        MOV     R4, #32
        MOV     R5, #255
        BL      OfferInternationalService
        Pull    "R1,R5,PC"

ConvertCNoToANo
        MOV     R3, R1                  ; put country no. in R3
        MOV     R2, #Inter_CNoToANo
OfferInternationalService
        Push    R14
        MOV     R1, #Service_International
        IssueService
        TEQ     R1, #0                  ; set Z flag if claimed
        Pull    PC

; Notify keyboard handler of new keyboard

NewKeyboard
        Push    "R1,R4,R14"
        STRB    R3, Keyboard
        STRB    R4, KeyAlphabet
        MOV     R2, #Inter_Keyboard
        BL      OfferInternationalService
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        Pull    "R1,R4,PC"
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; *****************************************************************************

; Set keyboard/alphabet for a particular country

DoOsbyteSetAlphKey ROUT
        TST     R1, #&80                ; if set then setting keyboard
        BNE     %FT10                   ; [setting keyboard]

; setting alphabet

        TEQ     R1, #&7F                ; 127 => just read alphabet
        LDREQB  R1, Alphabet
        MyOsbyte EQ

; 20/8/87 added code to do setting of default alphabet

        BL      GetCountry
        Push    R4
        BL      ConvertCNoToANo         ; try to convert R1 to alphabet number
        MOVNE   R4, R3                  ; if failed, try without converting
        BL      SetAlphabet             ; try to set this alphabet
        Pull    R4
        MOVNE   R1, #0                  ; if not claimed, return with X=0
        MyOsbyte NE

        LDRB    R1, Alphabet
        STRB    R3, Alphabet
        MyOsbyte

; setting keyboard

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        AND     R1, R1, #&7F
        TEQ     R1, #&7F                ; 127 => just read keyboard
        LDREQB  R1, Keyboard
        MyOsbyte EQ

        BL      GetCountry
        Push    R4
        BL      ConvertCNoToANo         ; validating country no.
        Pull    R4, NE
        MOVNE   R1, #0                  ; if not claimed, return with X=0
        MyOsbyte NE

        LDRB    R1, Keyboard            ; load old keyboard
        BL      NewKeyboard             ; R3=new keyboard, R4=alphabet for it
        Pull    R4
        MyOsbyte

; *****************************************************************************

; All osbytes from &1A to &69 are unused (apart from international ones!)

; End of unused block

; Write pointer shape number, mouse linkage
;
; R1 = 0        => pointer off
; R1 = 1..4     => use pointer shape 1..4, linked to mouse
; R1 = &81..&84 => use pointer shape 1..4, unlinked
;
Osbyte6A
        VDWS    R0
        LDRB    R3, [R0, #PointerShapeNumber]   ; get old shape number
        AND     R2, R1, #&7F                    ; allow 0..4, &80..&84
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        CMP     R2, #4
        BHI     %FT90                           ; ignore change if too high

        TEQ     R1, R3
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        BEQ     %FT90                           ; same as old
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        STRB    R1, [R0, #PointerShapeNumber]   ; will take effect on next vsync (UpdatePointer)
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90      MOV     R1, R3
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        MyOsbyte

; Set vdu driver's screen number
Osbyte70
        ByteToNosbod DoSetDriverBank
        MyOsbyte

; Set displayed screen number
Osbyte71
        ByteToNosbod DoSetDisplayBank
        MyOsbyte

; *SHADOW
Osbyte72
        MOV     R0, #&EF                ; redirect to shadow variable
        MOV     R2, #0
        B       DoOsbyteVar

; *****************************************************************************

; Read VDU Status
Osbyte75
        Push    R2
        ByteToNosbod DoReadVDUStatus
        Pull    R2
        MyOsbyte

; Reflect Keyboard Status In LEDs
Osbyte76
        MOV     R11, #KeyWorkSpace
        MOV     R12, #IOC
        BL      UpdateLEDs
        MyOsbyte

; Write Keys Pressed Info
Osbyte78
        BL      WriteKeysDown
        MyOsbyte

; Perform Keyboard Scan from 16
Osbyte7A
        MOV     R1, #&10
; and drop thru to ...

; Perform Keyboard Scan
Osbyte79
        BL      BBCScanKeys
        MyOsbyte

; Inform OS Printer Driver going Dormant
Osbyte7B
        BL      MakePrinterDormant
        ByteReturnV

; Clear Escape Condition
Osbyte7C
        BL      DoOsbyte7C
        MyOsbyte

; Set Escape Condition
Osbyte7D
        BL      DoOsbyte7D
        MyOsbyte

DoOsbyte7C
        Push    "R11, R14"
        MOV     R11, #0
        B       Osbyte7C7D

DoOsbyte7D
        Push    "R11, R14"
        MOV     R11, #&FF
Osbyte7C7D
        MOV     R12, #EscHan_ws
        STRB    R11, [R12, #ESC_Status-EscHan_ws]   ; set escape flag
        MOV     R14, PC
        LDMIA   R12, {R12, PC}
Exit7D
        TEQ     R12, #1
 [ Version >= 201
        Pull    "R11, PC", NE

827
        MRS     R11, CPSR                       ; Preserve old processor state
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        ORR     R12, R11, #SVC_mode             ; Switch to SVC mode preserving IRQ_bit
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        MSR     CPSR_c, R12
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        Push    R14                             ; Preserve SVC_R14
        SWI     XOS_SetCallBack
        Pull    R14                             ; Restore SVC_R14
833
        MSR     CPSR_c, R11                     ; Switch back to original mode, with V_bit intact from SWI
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        Pull    "R11, PC"
 |
        STREQB  R12, [R12, #IRQ_CallBack_Flag-1]
 ]
        Pull    "R11, PC"

; Acknowledge ESCAPE
Osbyte7E ROUT
        MOV     R3, #0
        LDRB    R3, [R3, #ESC_Status]
        TST     R3, #&40
        BEQ     NoESCToAck                      ; escape flag clear

        LDRB    R0, ESCeffect
        TEQ     R0, #0
        BNE     NoESCToAck                      ; escape effects disabled

        CLRPSR  I_bit, R0               ; enable interrupts (doing SOUNDs and
                                        ; closing files may take some time!)

        SWI     XSound_QInit
        BVS     %FT99                           ; no noises anyway!
        LDR     R0, =&01010008                  ; channel 8, amplitude &101
        MOV     R1, #&00010000                  ; pitch 0, duration 1
10
        SWI     XSound_ControlPacked
        BVS     %FT99                           ; (R0 would be corrupted)
        SUB     R0, R0, #1                      ; decrement channel
        TST     R0, #&FF                        ; if channel <> 0 then loop
        BNE     %BT10
99
        MOV     R0, #0

        STRB    R0, PageModeLineCount           ; zero line count

        LDRB    R1, ExecFileH
        CMP     R1, #0                          ; is EXEC file open (and V:=0)
        STRNEB  R0, ExecFileH                   ; if so, zero handle and close
                                                ; (will enable IRQs for me)
        SWINE   XOS_Find                        ; (R0=0, R1=handle)
        ByteReturnV VS                          ; if error then bomb out

        BL      FlushAll

NoESCToAck
        BL      DoOsbyte7C
        ANDS    R1, R3, #&40                    ; set R1 to 0 if wasn't escape,
        MOVNE   R1, #&FF                        ; &FF if was
        MyOsbyte


; Check for EOF
Osbyte7F
        MOV     R0, #OSArgs_EOFCheck
        SWI     XOS_Args                        ; result comes back in R2
        MOV     R1, R2
        ByteReturnV

; *****************************************************************************

; Read ADC or buffer status
Osbyte80
        AND     R1, R1, #&FF            ; no funny business

        TST     R1, #&80                ; is it ADVAL(-n)
        BEQ     AdvalPositive           ; no, then do adval(+ve)
        EOR     R1, R1, #&FF            ; convert to buffer number
        CLC                             ; (C:=0 and V:=0)
        TEQ     R1, #Buff_Mouse         ; is it mouse (only input buf >= 2) ?
        CMPNE   R1, #Buff_RS423Out ; C=1 <=> output buffer, so count spaces
                                        ; V=0, so will do count not purge

        ADR     R14, MyOsbyte80
CnpEntry
        Push    "R10,R12,R14"
        MOV     R10, #CNPV
        B       GoVec

MyOsbyte80
        MyOsbyte

AdvalPositive ROUT
        TEQ     R1, #7
        TEQNE   R1, #8
        Unused  NE

        Push    R11

        MOV     R11, R1                 ; save adval number
        SWI     XOS_Mouse
        Pull    R11, VS
        ByteReturnV VS

        TEQ     R11, #7
        MOVEQ   R1, R0                  ; R1 is required value

        MOV     R2, R1, LSR #8          ; put lo in R1, hi in R2
        AND     R1, R1, #&FF
        AND     R2, R2, #&FF

        Pull    R11
        MyOsbyte

; *****************************************************************************

; Perform INKEY operation
Osbyte81 ROUT
        TST     R2, #&80        ; is it negative inkey ?
        BEQ     %FT10           ; no, then not INKEY-256
        ANDS    R1, R1, #&FF    ; zero => INKEY(-256)
945
        MOVEQ   R1, #OSVersionID        ; then X := OS version number
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        MOVEQ   R2, #0                  ; and  Y := 0
        MyOsbyte EQ             ; if was INKEY-256 then claim
10
        Push    R14             ; save return address for if passing on
        ADR     R14, My81
        Push    R14             ; stack 'claiming' return address
        BL      DoInkeyOp       ; R14 = 'passing on' return address
NotMy81                         ; DoInkeyOp passed it on

        Pull    "R3,R14"        ; Throw away 'claiming' return address
                                ; and restore real passing on return address
        Unused                  ; else pass it on still

My81
        Pull    R14             ; throw away real passing on address
        ByteReturnV


; *****************************************************************************

; Read Machine High Order Address
Osbyte82
        MOV     R1, #&FF                ; Pretend we're an I/O processor !
        MOV     R2, #&FF
        MyOsbyte

; *****************************************************************************

; Read OSHWM
Osbyte83
        LDRB    R2, OSHWM               ; Read from silly variable
        MOV     R1, #0                  ; lo-byte is 0
        MyOsbyte

; *****************************************************************************

; Read Text Cursor Position (input cursor if split)
Osbyte86
        ByteToNosbod DoReadPOSVPOSI     ; Results in R1, R2 (i.e. POS, VPOS)
        MyOsbyte

; *****************************************************************************

; Read Screen Mode and Character at text cursor position
Osbyte87
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 [ {FALSE}
 ; The user's PSR is no longer there. In fact, it never was (or hasn't been
 ; for a long time), because the return address passed to the vector always
 ; had the I bit set.
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        LDR     R3, [R13, #StackOffset] ; get user's psr
        ANDS    R3, R3, #I_bit          ; EQ => irqs were on
        CLRPSR  I_bit, R3, EQ           ; so clear I_bit now
 ]
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 ; However, the SPSR _should_ have the user's interrupt state. If he had
 ; IRQs off, we will not have turned them back on, so neither we nor an
 ; interrupt routine will have called a a SWI, so SPSR will still be the
 ; SPSR from the original OS_Byte, with I set.
 ;
 ; If someone else is on ByteV, and passed it on, the rules say that they
 ; mustn't have enabled interrupts either, in which case any corrupted SPSR
 ; must still have I set.
 ;
 ; If the caller had interrupts enabled, an interrupt may have corrupted SPSR
 ; the worst effect of this is that we may not enable interrupts. So...
1010
        MRS     R3, SPSR
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        TST     R3, #I32_bit            ; EQ => IRQs were on
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        MSREQ   CPSR_c, #SVC2632        ; so turn them on
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        ByteToNosbod DoOSBYTE87         ; Results in R1, R2 (i.e. char, mode)
        MyOsbyte

; *****************************************************************************

; Insert Character Into Buffer
Osbyte8A
        BL      INSERT
        MyOsbyte

; *****************************************************************************

; Write Filing System Options : *OPT
Osbyte8B
        MOV     R0, #FSControl_OPT
        SWI     XOS_FSControl
        ByteReturnV

; *****************************************************************************

; Issue Paged ROM Service Request
Osbyte8F
        IssueService
        MyOsbyte

; *****************************************************************************

; Select vertical screen shift and interlace option :*TV
Osbyte90
        LDRB    R0, TVVertical
        STRB    R1, TVVertical
        MOV     R1, R0                  ; old vertical in R1

        AND     R0, R2, #1
        LDRB    R2, TVInterlace         ; old interlace in R2
        STRB    R0, TVInterlace

        MyOsbyte

; *****************************************************************************

; Get Character From Buffer
Osbyte91
        CLRV                                    ; remove not examine
RemVEntry
        ADR     R14, MyOsbyte80
REMOVE
        Push    "R10,R12,R14"
        MOV     R10, #REMV
        B       GoVec

; *****************************************************************************

; Examine Buffer Status
Osbyte98
        SETV                                    ; examine not remove
        B       RemVEntry

; *****************************************************************************

; Insert Character Code Into buffer checking for ESCAPE
Osbyte99
        BL      DoInsertESC
        MyOsbyte

; *****************************************************************************

; Update pseudo 6850 control register and soft copy

Osbyte9C
        MOV     r0, #7                          ; OS_SerialOp to modify 6850 control register
        SWI     XOS_SerialOp
        MyOsbyte

; *****************************************************************************

; 'Fast TUBE BPUT'

Osbyte9D
        MOV     R0, R1                  ; R0 := character
        MOV     R1, R2                  ; R1 := handle
        SWI     XOS_BPut
        ByteReturnV

; *****************************************************************************

; Read VDU Variable (0..15 implemented)
OsbyteA0
        ByteToNosbod DoReadVDUVariable
        MyOsbyte

; *****************************************************************************

; Read CMOS RAM
OsbyteA1    ; R1 = address , R2 = result
        CLRPSR  I_bit, R0       ; this may take some time
        MOV     R0, R1
        BL      Read            ; Read CMOS ram at address <R0>
        MOV     R2, R0          ; Result in R0, return in R2
        MyOsbyte

; Write CMOS RAM
OsbyteA2
        CLRPSR  I_bit, R0       ; this may take some time
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        MOVS	R0, R1
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        [ ProtectStationID
        MyOsbyte EQ
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        ]
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        [ STB :LAND: :DEF: ObsoleteNC1CMOS
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        ; Protect machine address CMOS (if not corrupt)
        ASSERT  EtherCheckCMOS = EtherAddrCMOS+6
        CMP     r0, #EtherAddrCMOS
        BLT     %FT10
        CMP     r0, #EtherCheckCMOS
        BGT     %FT10
        Push    "r0,r1"
        BL      GetMachineAddressCMOS
        Pull    "r0,r1"
        MyOsbyte EQ             ; don't allow write if address is valid
10
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        ]
        MOV     R1, R2
        BL      Write
        MOV     R1, R0          ; R1 is supposed to be preserved
        MyOsbyte

; *****************************************************************************

; OsByte 163,... applications call
OsbyteA3 ROUT
        TEQ     R1, #242
        Unused  NE                      ; not 242 - pass it on
        BL      %FT10
        MyOsbyte                        ; if come to here, has been claimed

10
        Push    R14
        ByteToNosbod DoOsbyte163_242
        Pull    R14                     ; if come to here, wasn't claimed
        Unused

; *****************************************************************************

; Read Output cursor Position
OsbyteA5
        ByteToNosbod DoReadPOSVPOSO     ; Result in R1,R2   (Horiz,vert)
        MyOsbyte

; *****************************************************************************
;
; All calls &A6 to &FF are implemented together.
; <NEW VALUE> = (<OLD VALUE> AND R2 ) EOR R1
; The old value is returned in R1 and the next location is returned in R2
;
; *****************************************************************************

DoOsbyteVar
        SUB     R0, R0, #MainVars       ; Point to this block starting at &A6
        LDRB    R3, [WsPtr, R0]         ; Load the byte
        AND     R11, R3, R2             ; Mangle it as required by the law
        EOR     R11, R11, R1            ; ................................
        MOV     R1, R3                  ; Return old value in R1
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        TEQ     R0, #OsbyteKeyStatus - MainVars    ; sorry - it's not pure any more.
        BEQ     DoOsbyteKeyStatus                  ; mea culpa. KJB.
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        STRB    R11, [R0, WsPtr]!       ; R0 +:= WsPtr
        LDRB    R2, [R0, #1]            ; Return contents of next loc in R2
        MyOsbyte

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; Keyboard status (OS_Byte 202).
; on entry: R0 = OsbyteKeyStatus - MainVars
;           R1 = old value
;           R11 = new value
DoOsbyteKeyStatus ROUT
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        Push    "R0-R3,R10"
        MOV     R10,#UpCallV            ; (Can't use OS_UpCall - it enables IRQs and we're documented as not doing so)
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        MOV     R3,R11                  ; R3 = new value
        MOV     R2,R1                   ; R2 = old value
        MOV     R1,#0                   ; pre-change
        MOV     R0,#UpCall_KeyboardStatus
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        BL      CallVector              ; go on then, interfere     (Corrupts R10 & WsPtr)
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        LDR     R0, [R13]               ; get back original R0
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        STRB    R3, [R0, #OsbyteVars]!  ; R0 +:= WsPtr
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        LDRB    R14, [R0, #1]           ; Return contents of next loc in R2
        STR     R14, [R13, #8]          ; by popping it on the stack

        TEQ     R2, R3                  ; don't bother with UpCall if it didn't change...

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        MOVNE   R10,#UpCallV
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        MOVNE   R1,#1                   ; post-change
        MOVNE   R0,#UpCall_KeyboardStatus
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        BLNE    CallVector              ; can't do anything about it now...

        Pull    "R0-R3,R10"
1207 1208
        MyOsbyte

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        LTORG

; All the unused OS_Byte calls

; ADC stuff
Osbyte10 ROUT
Osbyte11 ROUT
; Incr/Decr Polling Int
Osbyte16
Osbyte17
; Unused
Osbyte18
; Write 1MHz bus selection
Osbyte6B
; Write Usage of Shadow memory for normal access
Osbyte6C
; Make temporary filing system permanent
Osbyte6D
; &6E and &6F are reserved by 3rd parties
Osbyte6E
Osbyte6F
; &73 and &74 reserved for Electron
Osbyte73
Osbyte74
; Close SPOOL(ON) & EXEC files
Osbyte77
; Read top of USER RAM
Osbyte84
; Read top of user RAM for given mode
Osbyte85
; *CODE
Osbyte88
; *MOTOR
Osbyte89
; *TAPE
Osbyte8C
;  *ROM
Osbyte8D
; Enter Language ROM
Osbyte8E
; Access Mem.Map.IO &92..&97
Osbyte92
Osbyte93
Osbyte94
Osbyte95
Osbyte96
Osbyte97
; Write to VidULA & COPY
Osbyte9A
Osbyte9B
; Old Style Speech
Osbyte9E
Osbyte9F
; Check Processor Type
OsbyteA4
        Unused

; *****************************************************************************
;
;       GetCountry - Read country
;
; in:   R1 = country number or alphabet number
;
; out:  IF R1=0 THEN
;         R1:=Configured Country
;         IF R1=0 THEN
;           R1:=LastKbId
;           IF R1>=&20 THEN R1:=0
;         ENDIF
;       ENDIF
;
;       R0 undefined
;

GetCountry ROUT
        TEQ     R1, #0                          ; if not setting default, exit
        MOVNE   PC, R14

        Push    R14
        MOV     R0, #CountryCMOS                ; read configured country
        BL      Read
        MOVS    R1, R0                          ; if not Country Default, exit
        Pull    PC, NE

        MOV     R0, #KeyWorkSpace
        LDRB    R1, [R0, #:INDEX: LastKbId]     ; read last valid keyboard id
        CMP     R1, #&20                        ; if <&20 then use this
        MOVCS   R1, #0                          ; else set to 0
        Pull    PC

        END