184 lines
7.0 KiB
Plaintext
184 lines
7.0 KiB
Plaintext
ca65 V2.18 - Debian 2.19-1
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Main file : FileAccessFirmware.asm
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Current file: FileAccessFirmware.asm
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000000r 1 ; Copyright Terence J. Boldt (c)2020-2024
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000000r 1 ; Use of this source code is governed by an MIT
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000000r 1 ; license that can be found in the LICENSE file.
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000000r 1
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000000r 1 ; This file contains the source for the firmware
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000000r 1 ; that was formerly used to copy files from RPi
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000000r 1 ; to Apple II RAM
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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 InputByte = $c08e+SLOT*$10
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000000r 1 OutputByte = $c08d+SLOT*$10
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000000r 1 InputFlags = $c08b+SLOT*$10
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000000r 1 OutputFlags = $c087+SLOT*$10
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000000r 1
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000000r 1 ReadBlockCommand = $01
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000000r 1 WriteBlockCommand = $02
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000000r 1 GetTimeCommand = $03
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000000r 1 ChangeDriveCommand = $04
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000000r 1 ExecCommand = $05
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000000r 1 LoadFileCommand = $06
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000000r 1 SaveFileCommand = $07
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000000r 1 MenuCommand = $08
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000000r 1
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000000r 1 InputString = $fd67
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000000r 1 Monitor = $ff59
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000000r 1
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000000r 1 .org SLOT*$100 + $C000
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00C700 1 ;ID bytes for booting and drive detection
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00C700 1 E0 20 cpx #$20 ;ID bytes for ProDOS and the
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00C702 1 E0 00 cpx #$00 ; Apple Autostart ROM
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00C704 1 E0 03 cpx #$03 ;
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00C706 1
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00C706 1 A2 70 ldx #SLOT*$10
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00C708 1 86 2B stx $2b
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00C70A 1 86 43 stx Unit
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00C70C 1
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00C70C 1 ;force EPROM to second page on boot
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00C70C 1 A9 3F lda #$3f ;set all flags high and page 3 of EPROM for menu
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00C70E 1 PageJump:
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00C70E 1 8D F7 C0 sta OutputFlags
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00C711 1 4C 19 C7 jmp Start ;this jump is only called if coming in from PageJump with A=$2f
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00C714 1
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00C714 1 ;entry points for ProDOS
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00C714 1 DriverEntry:
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00C714 1 A9 0F lda #$0f ;set all flags high and page 0 of EPROM
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00C716 1 8D F7 C0 sta OutputFlags
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00C719 1
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00C719 1 Start:
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00C719 1 A9 A4 lda #$a4
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00C71B 1 85 33 sta $33
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00C71D 1
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00C71D 1 GetFilename:
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00C71D 1 20 67 FD jsr InputString
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00C720 1
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00C720 1 LoadFile:
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00C720 1 A9 00 lda #$00
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00C722 1 85 44 sta BufferLo
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00C724 1 A9 20 lda #$20
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00C726 1 85 45 sta BufferHi
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00C728 1 A9 06 lda #$06 ; send command 6 = load
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00C72A 1 20 74 C7 jsr SendByte
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00C72D 1 A0 00 ldy #$00
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00C72F 1 sendFilename:
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00C72F 1 B9 00 02 lda $0200,y
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00C732 1 C9 8D cmp #$8d
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00C734 1 F0 08 beq sendNullTerminator
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00C736 1 29 7F and #$7f
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00C738 1 20 74 C7 jsr SendByte
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00C73B 1 C8 iny
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00C73C 1 D0 F1 bne sendFilename
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00C73E 1 sendNullTerminator:
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00C73E 1 A9 00 lda #$00
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00C740 1 20 74 C7 jsr SendByte
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00C743 1
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00C743 1 20 8C C7 jsr GetByte
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00C746 1 85 46 sta BlockLo ; not really a block, just using the memory space
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00C748 1 20 8C C7 jsr GetByte
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00C74B 1 85 47 sta BlockHi
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00C74D 1 NextPage:
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00C74D 1 A5 47 lda BlockHi
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00C74F 1 F0 10 beq ReadFinalPage
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00C751 1 A0 00 ldy #$00
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00C753 1 NextByte:
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00C753 1 20 8C C7 jsr GetByte
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00C756 1 91 44 sta (BufferLo),y
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00C758 1 C8 iny
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00C759 1 D0 F8 bne NextByte
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00C75B 1 E6 45 inc BufferHi
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00C75D 1 C6 47 dec BlockHi
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00C75F 1 D0 EC bne NextPage
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00C761 1 ReadFinalPage:
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00C761 1 A5 46 lda BlockLo
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00C763 1 F0 0C beq ExitToMonitor
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00C765 1 A0 00 ldy #$00
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00C767 1 NextByteFinal:
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00C767 1 20 8C C7 jsr GetByte
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00C76A 1 91 44 sta (BufferLo),y
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00C76C 1 C8 iny
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00C76D 1 C4 46 cpy BlockLo
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00C76F 1 D0 F6 bne NextByteFinal
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00C771 1 ExitToMonitor:
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00C771 1 20 59 FF jsr Monitor
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00C774 1
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00C774 1 SendByte:
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00C774 1 2C FB C0 bit InputFlags
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00C777 1 70 FB bvs SendByte
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00C779 1 8D FD C0 sta OutputByte
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00C77C 1 .if HW_TYPE = 0
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00C77C 1 A9 2E lda #$2e ; set bit 0 low to indicate write started
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00C77E 1 8D F7 C0 sta OutputFlags
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00C781 1 finishWrite:
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00C781 1 2C FB C0 bit InputFlags
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00C784 1 50 FB bvc finishWrite
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00C786 1 A9 2F lda #$2f
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00C788 1 8D F7 C0 sta OutputFlags
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00C78B 1 .endif
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00C78B 1 60 rts
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00C78C 1
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00C78C 1 GetByte:
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00C78C 1 .if HW_TYPE = 0
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00C78C 1 A2 2D ldx #$2d ;set read flag low
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00C78E 1 8E F7 C0 stx OutputFlags
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00C791 1 .endif
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00C791 1 waitRead:
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00C791 1 2C FB C0 bit InputFlags
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00C794 1 30 FB bmi waitRead
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00C796 1 AD FE C0 lda InputByte
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00C799 1 .if HW_TYPE = 0
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00C799 1 A2 2F ldx #$2f ;set all flags high
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00C79B 1 8E F7 C0 stx OutputFlags
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00C79E 1 finishRead:
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00C79E 1 2C FB C0 bit InputFlags
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00C7A1 1 10 FB bpl finishRead
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00C7A3 1 .endif
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00C7A3 1 end:
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00C7A3 1 60 rts
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00C7A4 1
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00C7A4 1 00 00 00 00 .repeat 251-<end
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00C7A8 1 00 00 00 00
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00C7AC 1 00 00 00 00
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00C7B0 1 00 00 00 00
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00C7B4 1 00 00 00 00
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00C7B8 1 00 00 00 00
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00C7BC 1 00 00 00 00
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00C7C0 1 00 00 00 00
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00C7C4 1 00 00 00 00
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00C7C8 1 00 00 00 00
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00C7CC 1 00 00 00 00
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00C7D0 1 00 00 00 00
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00C7D4 1 00 00 00 00
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00C7D8 1 00 00 00 00
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00C7DC 1 00 00 00 00
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00C7E0 1 00 00 00 00
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00C7E4 1 00 00 00 00
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00C7E8 1 00 00 00 00
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00C7EC 1 00 00 00 00
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00C7F0 1 00 00 00 00
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00C7F4 1 00 00 00 00
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00C7F8 1 00 00 00 00
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00C7FC 1 .byte 0
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00C7FC 1 .endrepeat
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00C7FC 1
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00C7FC 1 00 00 .byte 0,0 ;0000 blocks = check status
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00C7FE 1 07 .byte 7 ;bit set(0=status 1=read 2=write) unset(3=format, 4/5=number of volumes, 6=interruptable, 7=removable)
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00C7FF 1 14 .byte DriverEntry&$00FF ;low byte of entry
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00C800 1
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00C800 1
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