mirror of
https://github.com/tjboldt/Apple2-IO-RPi.git
synced 2024-11-25 21:33:15 +00:00
179 lines
6.8 KiB
Plaintext
179 lines
6.8 KiB
Plaintext
ca65 V2.18 - Ubuntu 2.18-1
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Main file : Driver.asm
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Current file: Driver.asm
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000000r 1 ; ProDOS Global Page
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000000r 1 Device5S1 = $bf1a ;POINTER FOR SLOT 5 DRIVE 1 DRIVER
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000000r 1 DeviceCount = $bf31 ;DEVICE COUNT -1
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000000r 1 DeviceList = $bf32 ;DEVICE LIST
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000000r 1
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000000r 1 ; ProDOS Zero Page
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000000r 1 Command = $42 ;ProDOS Command
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000000r 1 Unit = $43 ;ProDOS unit (SDDD0000)
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000000r 1 BufferLo = $44
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000000r 1 BufferHi = $45
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000000r 1 BlockLo = $46
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000000r 1 BlockHi = $47
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000000r 1
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000000r 1 ; ProDOS Error Codes
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000000r 1 IOError = $27
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000000r 1 NoDevice = $28
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000000r 1 WriteProtect = $2B
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000000r 1
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000000r 1 SlotDrive = $50
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000000r 1 InputByte = $c0de
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000000r 1 OutputByte = $c0dd
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000000r 1 ReadBlockCommand = $01
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000000r 1 WriteBlockCommand = $02
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000000r 1 NibbleStorage = $1d
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000000r 1
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000000r 1 .org $1000
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001000 1
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001000 1 ; Register the driver with ProDOS
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001000 1 A9 16 lda #<Driver
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001002 1 8D 1A BF sta Device5S1
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001005 1 A9 10 lda #>Driver
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001007 1 8D 1B BF sta Device5S1+1
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00100A 1 ; Add the drive to the device list
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00100A 1 EE 31 BF inc DeviceCount
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00100D 1 AD 31 BF lda DeviceCount
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001010 1 A0 50 ldy #SlotDrive
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001012 1 99 32 BF sta DeviceList,y
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001015 1 60 rts
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001016 1
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001016 1 ; ProDOS Driver code
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001016 1 ; First check that this is the right drive
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001016 1 Driver:
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001016 1 A5 43 lda Unit
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001018 1 C9 50 cmp #SlotDrive
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00101A 1 F0 04 beq DoCommand ;correct device, so proceed
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00101C 1 38 sec ;set carry as ProDOS treats this as an error
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00101D 1 A9 28 lda #NoDevice ;put the error code in accumulator for ProDOS
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00101F 1 60 rts
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001020 1
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001020 1 ; Check which command is being requested
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001020 1 DoCommand:
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001020 1 A5 42 lda Command
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001022 1 F0 0C beq GetStatus ;0 = Status command
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001024 1 C9 01 cmp #ReadBlockCommand
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001026 1 F0 10 beq ReadBlock
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001028 1 C9 02 cmp #WriteBlockCommand
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00102A 1 F0 34 beq WriteBlock
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00102C 1 38 sec ;set carry as we don't support any other commands
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00102D 1 A9 53 lda #$53 ;Invalid parameter error
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00102F 1 60 rts
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001030 1
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001030 1 ; ProDOS Status Command Handler
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001030 1 GetStatus:
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001030 1 A2 FF ldx #$ff ;low byte number of blocks
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001032 1 A0 FF ldy #$ff ;high byte number of blocks
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001034 1 A9 00 lda #$0 ;zero accumulator and clear carry for success
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001036 1 18 clc
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001037 1 60 rts
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001038 1
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001038 1 ; ProDOS Read Block Command
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001038 1 ReadBlock:
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001038 1 A9 01 lda #ReadBlockCommand
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00103A 1 20 88 10 jsr SendByte
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00103D 1 A5 46 lda BlockLo
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00103F 1 20 88 10 jsr SendByte
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001042 1 A5 47 lda BlockHi
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001044 1 20 88 10 jsr SendByte
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001047 1 A0 00 ldy #$0
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001049 1 20 57 10 jsr read256
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00104C 1 E6 45 inc BufferHi
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00104E 1 20 57 10 jsr read256
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001051 1 C6 45 dec BufferHi
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001053 1 A9 00 lda #$0 ;zero accumulator and clear carry for success
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001055 1 18 clc
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001056 1 60 rts
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001057 1
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001057 1 read256:
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001057 1 20 B0 10 jsr GetByte
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00105A 1 91 44 sta (BufferLo),y
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00105C 1 C8 iny
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00105D 1 D0 F8 bne read256
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00105F 1 60 rts
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001060 1
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001060 1 ; ProDOS Write Block Command
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001060 1 WriteBlock:
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001060 1 A9 02 lda #WriteBlockCommand
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001062 1 20 88 10 jsr SendByte
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001065 1 A5 46 lda BlockLo
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001067 1 20 88 10 jsr SendByte
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00106A 1 A5 47 lda BlockHi
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00106C 1 20 88 10 jsr SendByte
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00106F 1 A0 00 ldy #$0
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001071 1 20 7F 10 jsr write256
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001074 1 E6 45 inc BufferHi
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001076 1 20 7F 10 jsr write256
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001079 1 C6 45 dec BufferHi
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00107B 1 A9 00 lda #$0 ;zero accumulator and clear carry for success
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00107D 1 18 clc
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00107E 1 60 rts
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00107F 1
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00107F 1 write256:
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00107F 1 B1 44 lda (BufferLo),y
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001081 1 20 88 10 jsr SendByte
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001084 1 C8 iny
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001085 1 D0 F8 bne write256
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001087 1 60 rts
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001088 1
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001088 1 SendByte:
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001088 1 48 pha
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001089 1 4A lsr
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00108A 1 4A lsr
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00108B 1 4A lsr
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00108C 1 4A lsr
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00108D 1 20 95 10 jsr SendNibble
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001090 1 68 pla
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001091 1 20 95 10 jsr SendNibble
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001094 1 60 rts
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001095 1
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001095 1 SendNibble:
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001095 1 29 0F and #$0F
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001097 1 09 70 ora #$70 ;Write bit low
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001099 1 48 pha
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00109A 1 waitWrite:
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00109A 1 AD DE C0 lda InputByte
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00109D 1 0A asl ;Second highest bit goes low when ready
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00109E 1 30 FA bmi waitWrite
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0010A0 1 68 pla
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0010A1 1 8D DD C0 sta OutputByte
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0010A4 1 finishWrite:
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0010A4 1 AD DE C0 lda InputByte
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0010A7 1 0A asl
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0010A8 1 10 FA bpl finishWrite
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0010AA 1 A9 FF lda #$FF
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0010AC 1 8D DD C0 sta OutputByte
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0010AF 1 60 rts
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0010B0 1
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0010B0 1 GetByte:
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0010B0 1 20 C1 10 jsr GetNibble
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0010B3 1 0A asl
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0010B4 1 0A asl
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0010B5 1 0A asl
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0010B6 1 0A asl
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0010B7 1 85 1D sta NibbleStorage
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0010B9 1 20 C1 10 jsr GetNibble
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0010BC 1 29 0F and #$0f
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0010BE 1 05 1D ora NibbleStorage
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0010C0 1 60 rts
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0010C1 1
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0010C1 1 GetNibble:
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0010C1 1 A9 B0 lda #$b0 ;set read flag low
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0010C3 1 8D DD C0 sta OutputByte
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0010C6 1 waitRead:
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0010C6 1 AD DE C0 lda InputByte
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0010C9 1 30 FB bmi waitRead
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0010CB 1 09 F0 ora #$f0 ;set all flags high
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0010CD 1 8D DD C0 sta OutputByte
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0010D0 1 48 pha
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0010D1 1 finishRead:
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0010D1 1 AD DE C0 lda InputByte
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0010D4 1 10 FB bpl finishRead
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0010D6 1 68 pla
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0010D7 1 60 rts
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0010D8 1
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0010D8 1
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