Use FileCore terminology for clarity

s/Defns

@@ -115,8 +115,7 @@ Zone0Bits                * Zone0DiscRecSz * 8
 MyMaxSupportedDiscOp     * DiscOp_ReadTrk
 MyMaxSupportedDrive      * 0
 MyMinSupportedDriveSize  * 8 * 1024
-
-MyMySecSizel2b  *       10       ; 9 = 512, 10 = 1024
+MyLog2SectorSize         * 10       ; 9 = 512, 10 = 1024
 ; n.b. 512 byte sector has max disc size approx 256MB. 1024 max is 512MB
 
 ChangeDyn_RamFS          * 5 ; Our DA number

s/RamFS15

@@ -51,7 +51,7 @@ LowLevelEntry ROUT
 
         ASSERT  MyMaxSupportedDrive = 0         ; No need to BIC out the drive bits in R2
       [ BigDisc2
-        MOV     R2, R2, LSL #MyMySecSizel2b
+        MOV     R2, R2, LSL #MyLog2SectorSize
       ]
         ADDS    R6, R2, R4                      ; end disc add
         SUBNE   R6, R6, #1
@@ -137,7 +137,7 @@ Read
         CLRV
 95
       [ BigDisc2
-        MOV     R2, R2, LSR #MyMySecSizel2b
+        MOV     R2, R2, LSR #MyLog2SectorSize
       ]
         STRVS   R0, [SP]
       [ Debug3
@@ -227,7 +227,7 @@ DoMount ROUT
         STR     R1, BufferSize
 
       [ BigDisc2
-        MOV     R2, R2, LSL #MyMySecSizel2b
+        MOV     R2, R2, LSL #MyLog2SectorSize
       ]
 
         MOV     R1, R3

s/RamFS50

@@ -19,7 +19,7 @@
 ; exceeding its max and 'blowing' part of RAMFSFiler
 
 SkeletonDiscRec         ; fields marked * need filling in
-        DCB     MyMySecSizel2b ; Log2SectorSize
+        DCB     MyLog2SectorSize ; Log2SectorSize
         DCB     128     ; SecPerTrk (this is a RAM disc)
         DCB     1       ; Heads
         DCB     DensitySingle  ; Density
@@ -123,7 +123,7 @@ InitRAMDisc ROUT
         MOV     r4, #0
         STMIA   r2, {r0,r3,r4}                  ; byte address 0 on drive 0
         MOV     r3, #0
-        MOV     r4, #(1<<MyMySecSizel2b)
+        MOV     r4, #1:SHL:MyLog2SectorSize
         LDR     r8, FileCorePrivate
         SWI     XFileCore_DiscOp64
         ADD     sp, sp, #SzExtendedDiscAddress
@@ -200,7 +200,7 @@ InitDiscRec     ROUT
         ; r6 = number of bits in a zone
         ; r7 = number of allocation bits in the map
         ; r8 = ids per zone
-Min_IdLen       *      MyMySecSizel2b+3    ; min allowed idlen = log2 sectorsize+3
+Min_IdLen       *       MyLog2SectorSize + 3 ; min allowed idlen = log2(bits in a sector)
       [ BigMaps
 Max_IdLen       *       19      ; max allowed idlen
       |