mirror of
https://github.com/tjboldt/Apple2-IO-RPi.git
synced 2024-11-22 02:30:46 +00:00
181 lines
6.9 KiB
Plaintext
181 lines
6.9 KiB
Plaintext
ca65 V2.17 - Raspbian 2.17-1
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Main file : MenuFirmware.asm
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Current file: MenuFirmware.asm
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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 .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 1 of EPROMi
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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
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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 #$0f ;set all flags high and page 0 of EPROM
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00C716 1 8D F7 C0 sta OutputFlags
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00C719 1 ;since the firmware page changes to 0, this falls through to the driver
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00C719 1
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00C719 1 Start:
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00C719 1 A9 F0 lda #$f0 ;restore COUT after PR# called
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00C71B 1 85 36 sta $36
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00C71D 1 A9 FD lda #$fd
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00C71F 1 85 37 sta $37
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00C721 1 20 58 FC jsr $fc58 ;clear screen and show menu options
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00C724 1 A0 00 ldy #$00
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00C726 1 PrintString:
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00C726 1 B9 B8 C7 lda Text,y
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00C729 1 F0 08 beq WaitForRPi
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00C72B 1 09 80 ora #$80
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00C72D 1 20 ED FD jsr $fded
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00C730 1 C8 iny
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00C731 1 D0 F3 bne PrintString
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00C733 1
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00C733 1 WaitForRPi:
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00C733 1 AD FB C0 lda InputFlags
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00C736 1 2A rol
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00C737 1 B0 0D bcs OK
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00C739 1 A9 FF lda #$ff
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00C73B 1 20 A8 FC jsr $fca8
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00C73E 1 A9 AE lda #$ae
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00C740 1 20 ED FD jsr $fded
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00C743 1 4C 33 C7 jmp WaitForRPi
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00C746 1
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00C746 1 OK:
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00C746 1 20 58 FC jsr $fc58 ;clear screen
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00C749 1
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00C749 1 A9 08 lda #MenuCommand ;request menu text from RPi
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00C74B 1 20 6A C7 jsr SendByte
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00C74E 1
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00C74E 1 DumpOutput:
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00C74E 1 20 88 C7 jsr GetByte
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00C751 1 C9 00 cmp #$00
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00C753 1 F0 06 beq GetChar
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00C755 1 20 ED FD jsr $fded
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00C758 1 18 clc
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00C759 1 90 F3 bcc DumpOutput
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00C75B 1
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00C75B 1 GetChar:
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00C75B 1 20 0C FD jsr $fd0c
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00C75E 1 38 sec ;subtract ascii "1" to get 0 - 3 from "1" to "4"
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00C75F 1 E9 B1 sbc #$b1
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00C761 1 0A asl ;put in top nibble as EPROM page
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00C762 1 0A asl
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00C763 1 0A asl
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00C764 1 0A asl
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00C765 1 09 0F ora #$0f ;set all flags high
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00C767 1 4C 0E C7 jmp PageJump
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00C76A 1
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00C76A 1 SendByte:
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00C76A 1 48 pha
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00C76B 1 waitWrite:
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00C76B 1 AD FB C0 lda InputFlags
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00C76E 1 2A rol
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00C76F 1 2A rol
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00C770 1 B0 F9 bcs waitWrite
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00C772 1 68 pla
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00C773 1 8D FD C0 sta OutputByte
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00C776 1 A9 3E lda #$3e ; set bit 0 low to indicate write started
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00C778 1 8D F7 C0 sta OutputFlags
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00C77B 1 finishWrite:
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00C77B 1 AD FB C0 lda InputFlags
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00C77E 1 2A rol
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00C77F 1 2A rol
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00C780 1 90 F9 bcc finishWrite
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00C782 1 A9 3F lda #$3f
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00C784 1 8D F7 C0 sta OutputFlags
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00C787 1 60 rts
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00C788 1
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00C788 1 GetByte:
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00C788 1 A9 3D lda #$3d ;set read flag low
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00C78A 1 8D F7 C0 sta OutputFlags
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00C78D 1 waitRead:
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00C78D 1 AD FB C0 lda InputFlags
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00C790 1 2A rol
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00C791 1 B0 FA bcs waitRead
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00C793 1 AD FE C0 lda InputByte
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00C796 1 48 pha
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00C797 1 A9 3F lda #$3f ;set all flags high
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00C799 1 8D F7 C0 sta OutputFlags
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00C79C 1 finishRead:
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00C79C 1 AD FB C0 lda InputFlags
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00C79F 1 2A rol
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00C7A0 1 90 FA bcc finishRead
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00C7A2 1 68 pla
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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 183-<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 .byte 0
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00C7B8 1 .endrepeat
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00C7B8 1
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00C7B8 1 Text:
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00C7B8 1 41 70 70 6C .byte "Apple2-IO-RPi",$8d
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00C7BC 1 65 32 2D 49
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00C7C0 1 4F 2D 52 50
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00C7C4 1 69 8D
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00C7C6 1 28 63 29 32 .byte "(c)2020-2021 Terence J. Boldt",$8d
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00C7CA 1 30 32 30 2D
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00C7CE 1 32 30 32 31
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00C7D2 1 20 54 65 72
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00C7D6 1 65 6E 63 65
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00C7DA 1 20 4A 2E 20
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00C7DE 1 42 6F 6C 64
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00C7E2 1 74 8D
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00C7E4 1 8D .byte $8d
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00C7E5 1 57 61 69 74 .byte "Waiting for RPi...",$00
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00C7E9 1 69 6E 67 20
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00C7ED 1 66 6F 72 20
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00C7F1 1 52 50 69 2E
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00C7F5 1 2E 2E 00
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00C7F8 1
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00C7F8 1 88 .byte <GetByte ;all firmware pages have pointer to GetByte routine here
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00C7F9 1 C7 .byte >GetByte
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00C7FA 1 6A .byte <SendByte ;all firmware pages have pointer to SendByte routine here
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00C7FB 1 C7 .byte >SendByte
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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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