mirror of https://github.com/a2-4am/passport.git
211 lines
5.4 KiB
Plaintext
Executable File
211 lines
5.4 KiB
Plaintext
Executable File
;-------------------------------
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; YE OLDE GRAND UNIFIED MEMORY MAP
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;
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; 0200..03FF - clobbered by DOS 3.2 tracer (and other supported 13-sector disks like Choplifter)
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; 0200..02CB - clobbered by exodecrunch
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; 02D8..038D - clobbered by Optimum reader
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; 0300..0395 - clobbered by DOS 3.3 tracer
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; 0800..08FF - clobbered by all boot tracers and RAM disk
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; 0900..09FF - clobbered by Special Delivery tracer and RAM disk
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; 0A00..0AFF - backup of zero page during Special Delivery tracer, used by RAM disk
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; 0B00..0BFF - used by RAM disk
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; 0C00..0CFF - clobbered by Special Delivery tracer
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; 0CD0..0EFF - sector map
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; 0F00..0FFF - backup of page $BF (SwapProDOS)
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; 1000..1FFF - data buffer for current track
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; 2000..35FF - clobbered by Special Delivery tracer
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; 2600..26FF - clobbered by all boot tracers (copy of C600)
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; 3600..3FFF - clobbered by lomem DOS 3.2/3.3 tracers, Special Delivery tracer
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; 4000..B1FF - program code
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; B200..BFFF - clobbered by DOS boot tracer (RDOS is B200+, DOS 3.x is B600+)
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;-------------------------------
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; /!\ execution falls through from CreateFileOnHardDisk
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;-------------------------------
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; SwapProDOS
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; saves/restores memory used by ProDOS ($BF00..$BFFF)
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; in: none
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; out: all flags and registers preserved
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;-------------------------------
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SwapProDOS
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php
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pha
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lda #$BF
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ldx #$0F
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ldy #$01
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sec
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jsr SwapMemory
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pla
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plp
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- rts
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;-------------------------------
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; MoveT00PakLow/MoveT00PakHigh
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;
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; Copy compressed blob of track 0 patchers
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; from low memory to high memory or vice versa.
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; Each entry point is always safe to call,
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; e.g. if the blob is already low and you call
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; MoveT00PakLow, it just exits.
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;
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; in: none
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; out: if blob needs to be copied, exits via CopyMemory
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; if no action, all registers preserved
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;-------------------------------
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MoveT00PakLow
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bit T00PakPtr+1
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bpl - ; already low
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lda #$B2
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ldx #$32
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bne + ; always branches
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MoveT00PakHigh
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bit T00PakPtr+1
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bmi - ; already high
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lda #$32
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ldx #$B2
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+ stx T00PakPtr+1
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ldy #$0D
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!byte $2C ; hide next LDY
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; /!\ execution falls through here
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CopyMemory1
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ldy #$01
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; /!\ execution falls through here
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;-------------------------------
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; CopyMemory
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; in: A = source address (high)
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; X = destination address (high)
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; Y = number of pages to copy
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; out: Z = 1
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; X = 0
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; Y = 0
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; all other flags and registers clobbered
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;-------------------------------
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CopyMemory
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sta @source+2
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stx @dest+2
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ldx #$00
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@source lda $FF00,x
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@dest sta $FF00,x
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inx
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bne @source
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inc @source+2
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inc @dest+2
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dey
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bne @source
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rts
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;-------------------------------
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; ReorderBuffer - convert data
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; buffer between ProDOS and
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; DOS 3.3 ordering (use after
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; read or before write under
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; ProDOS)
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; in: none
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; out: all flags clobbered
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; all registers clobbered
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;-------------------------------
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ReorderBuffer
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lda #BASEPAGE+1
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ldx #BASEPAGE+$0E
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ldy #$07
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clc
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; /!\ execution falls through here
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;-------------------------------
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; SwapMemory
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; in: A = source address (high)
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; X = destination address (high)
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; Y = number of pages to copy
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; C = dest direction (set: +, clear: -)
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; out: all flags and registers clobbered
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;-------------------------------
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SwapMemory
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sta @source1+2
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sta @source2+2
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stx @dest1+2
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stx @dest2+2
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lda #$FF
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adc #0
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ora #1
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sta @destadjust+1
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ldx #$00
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@source1 lda $FF00,x
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pha
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@dest1 lda $FF00,x
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@source2 sta $FF00,x
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pla
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@dest2 sta $FF00,x
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inx
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bne @source1
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inc @source1+2
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inc @source2+2
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lda @dest1+2
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clc
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@destadjust
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adc #$D1
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sta @dest1+2
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sta @dest2+2
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dey
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bne @source1
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rts
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;-------------------------------
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; ReorderLogicalToPhysical - reorder pages in
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; track data buffer for disks that expect
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; sectors in physical sector order
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;
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; 1 -> 7
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; 2 -> E
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; 3 -> 6
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; 4 -> D
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;
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; 6 -> C
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; 7 -> 4
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; 8 -> B
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; 9 -> 3
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;
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; B -> 2
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; C -> 9
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; D -> 1
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; E -> 8
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;
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; 0123456789ABCDEF
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; 07E6D5C4B3A2918F
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; in: track buffer has data in logical sector order
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; out: A,X,Y clobbered
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;-------------------------------
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ReorderLogicalToPhysical
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ldy #$00
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- ldx $1800,y
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lda $1e00,y
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sta $1800,y
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lda $1200,y
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sta $1e00,y
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lda $1b00,y
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sta $1200,y
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txa
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sta $1b00,y
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ldx $1100,y
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lda $1d00,y
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sta $1100,y
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lda $1400,y
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sta $1d00,y
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lda $1700,y
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sta $1400,y
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txa
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sta $1700,y
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ldx $1900,y
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lda $1c00,y
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sta $1900,y
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lda $1600,y
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sta $1c00,y
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lda $1300,y
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sta $1600,y
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txa
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sta $1300,y
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iny
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bne -
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rts
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