forked from Apple-2-HW/Apple2-IO-RPi
275 lines
10 KiB
Plaintext
275 lines
10 KiB
Plaintext
ca65 V2.18 - N/A
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Main file : Shell.asm
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Current file: Shell.asm
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000000r 1 ; Copyright Terence J. Boldt (c)2021-2022
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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 SHELL
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000000r 1 ; application that runs on the Apple II to talk
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000000r 1 ; to the Raspberry Pi
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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
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000000r 1 OutputByte = $c08d
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000000r 1 InputFlags = $c08b
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000000r 1 OutputFlags = $c087
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000000r 1
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000000r 1 ResetCommand = $00
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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 ShellCommand = $09
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000000r 1
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000000r 1 InputString = $fd6a
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000000r 1 StringBuffer = $0200
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000000r 1 PrintChar = $fded
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000000r 1 Keyboard = $c000
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000000r 1 ClearKeyboard = $c010
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000000r 1 Home = $fc58
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000000r 1 Wait = $fca8
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000000r 1 PromptChar = $33
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000000r 1 Read80Col = $c01f
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000000r 1 TextPage1 = $c054
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000000r 1 TextPage2 = $c055
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000000r 1
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000000r 1 htab = $24
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000000r 1 vtab = $25
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000000r 1 BasL = $28
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000000r 1 htab80 = $057b
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000000r 1 BasCalc = $fbc1
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000000r 1
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000000r 1 LastChar = $06
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000000r 1 SlotL = $fe
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000000r 1 SlotH = $ff
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000000r 1 ESC = $9b
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000000r 1
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000000r 1 .org $2000
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002000 1 A2 07 ldx #$07 ; start at slot 7
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002002 1 DetectSlot:
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002002 1 A0 00 ldy #$00
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002004 1 A9 FC lda #$fc
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002006 1 85 FE sta SlotL
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002008 1 8A txa
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002009 1 09 C0 ora #$c0
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00200B 1 85 FF sta SlotH
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00200D 1 B1 FE lda (SlotL),y
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00200F 1 D0 1C bne nextSlot
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002011 1 C8 iny
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002012 1 B1 FE lda (SlotL),y
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002014 1 D0 17 bne nextSlot
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002016 1 C8 iny
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002017 1 B1 FE lda (SlotL),y
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002019 1 C9 17 cmp #$17
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00201B 1 D0 10 bne nextSlot
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00201D 1 C8 iny
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00201E 1 B1 FE lda (SlotL),y
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002020 1 C9 14 cmp #$14
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002022 1 D0 09 bne nextSlot
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002024 1 8A txa
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002025 1 0A asl
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002026 1 0A asl
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002027 1 0A asl
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002028 1 0A asl
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002029 1 AA tax
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00202A 1 18 clc
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00202B 1 90 04 bcc Start
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00202D 1 nextSlot:
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00202D 1 CA dex
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00202E 1 D0 D2 bne DetectSlot
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002030 1 60 rts
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002031 1 Start:
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002031 1 A9 8D lda #$8d
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002033 1 20 00 C3 jsr $c300 ; force 80 columns
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002036 1 A5 06 lda LastChar
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002038 1 48 pha
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002039 1 2C 10 C0 bit ClearKeyboard
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00203C 1 A9 00 lda #ResetCommand
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00203E 1 20 D7 20 jsr SendByte
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002041 1 A9 09 lda #ShellCommand
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002043 1 20 D7 20 jsr SendByte
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002046 1 20 52 20 jsr DumpOutput
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002049 1 A9 00 lda #ResetCommand
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00204B 1 20 D7 20 jsr SendByte
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00204E 1 68 pla
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00204F 1 85 06 sta LastChar
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002051 1 60 rts
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002052 1
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002052 1 DumpOutput:
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002052 1 20 F5 20 jsr GetByte
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002055 1 B0 2A bcs checkInput
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002057 1 C9 00 cmp #$00
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002059 1 F0 39 beq endOutput
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00205B 1 48 pha
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00205C 1 20 54 21 jsr ClearCursor
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00205F 1 68 pla
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002060 1 C9 48 cmp #'H'
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002062 1 F0 3A beq setColumn
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002064 1 C9 56 cmp #'V'
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002066 1 F0 44 beq setRow
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002068 1 C9 43 cmp #'C'
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00206A 1 F0 29 beq clearScreen
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00206C 1 C9 54 cmp #'T'
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00206E 1 F0 4A beq setTop
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002070 1 C9 42 cmp #'B'
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002072 1 F0 4E beq setBottom
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002074 1 C9 55 cmp #'U'
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002076 1 F0 52 beq moveUp
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002078 1 20 ED FD jsr PrintChar
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00207B 1 20 23 21 jsr SetCursor
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00207E 1 4C 52 20 jmp DumpOutput
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002081 1 checkInput:
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002081 1 2C 00 C0 bit Keyboard ;check for keypress
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002084 1 10 CC bpl DumpOutput ;keep dumping output if no keypress
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002086 1 AD 00 C0 lda Keyboard ;send keypress to RPi
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002089 1 29 7F and #$7f
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00208B 1 20 D7 20 jsr SendByte
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00208E 1 2C 10 C0 bit ClearKeyboard
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002091 1 4C 52 20 jmp DumpOutput
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002094 1 endOutput:
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002094 1 60 rts
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002095 1 clearScreen:
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002095 1 20 58 FC jsr Home
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002098 1 20 23 21 jsr SetCursor
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00209B 1 4C 52 20 jmp DumpOutput
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00209E 1 setColumn:
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00209E 1 20 F5 20 jsr GetByte
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0020A1 1 85 24 sta htab
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0020A3 1 8D 7B 05 sta htab80
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0020A6 1 20 23 21 jsr SetCursor
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0020A9 1 4C 52 20 jmp DumpOutput
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0020AC 1 setRow:
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0020AC 1 20 F5 20 jsr GetByte
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0020AF 1 85 25 sta vtab
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0020B1 1 20 C1 FB jsr BasCalc
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0020B4 1 20 23 21 jsr SetCursor
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0020B7 1 4C 52 20 jmp DumpOutput
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0020BA 1 setTop:
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0020BA 1 20 F5 20 jsr GetByte
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0020BD 1 85 22 sta $22
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0020BF 1 4C 52 20 jmp DumpOutput
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0020C2 1 setBottom:
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0020C2 1 20 F5 20 jsr GetByte
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0020C5 1 85 23 sta $23
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0020C7 1 4C 52 20 jmp DumpOutput
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0020CA 1 moveUp:
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0020CA 1 C6 25 dec vtab
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0020CC 1 A5 25 lda vtab
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0020CE 1 20 C1 FB jsr BasCalc
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0020D1 1 20 23 21 jsr SetCursor
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0020D4 1 4C 52 20 jmp DumpOutput
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0020D7 1
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0020D7 1 SendByte:
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0020D7 1 48 pha
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0020D8 1 waitWrite:
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0020D8 1 BD 8B C0 lda InputFlags,x
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0020DB 1 2A rol
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0020DC 1 2A rol
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0020DD 1 B0 F9 bcs waitWrite
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0020DF 1 68 pla
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0020E0 1 9D 8D C0 sta OutputByte,x
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0020E3 1 A9 1E lda #$1e ; set bit 0 low to indicate write started
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0020E5 1 9D 87 C0 sta OutputFlags,x
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0020E8 1 finishWrite:
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0020E8 1 BD 8B C0 lda InputFlags,x
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0020EB 1 2A rol
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0020EC 1 2A rol
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0020ED 1 90 F9 bcc finishWrite
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0020EF 1 A9 1F lda #$1f
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0020F1 1 9D 87 C0 sta OutputFlags,x
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0020F4 1 60 rts
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0020F5 1
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0020F5 1 GetByte:
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0020F5 1 2C 00 C0 bit Keyboard ; skip byte read if key pressed
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0020F8 1 90 10 bcc keyPressed
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0020FA 1 A9 1D lda #$1d ;set read flag low
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0020FC 1 9D 87 C0 sta OutputFlags,x
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0020FF 1 waitRead:
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0020FF 1 BD 8B C0 lda InputFlags,x
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002102 1 2A rol
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002103 1 90 0C bcc readByte
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002105 1 2C 00 C0 bit Keyboard ;keypress will abort waiting to read
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002108 1 10 F5 bpl waitRead
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00210A 1 keyPressed:
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00210A 1 A9 1F lda #$1f ;set all flags high and exit
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00210C 1 9D 87 C0 sta OutputFlags,x
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00210F 1 38 sec ;failure
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002110 1 60 rts
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002111 1 readByte:
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002111 1 BD 8E C0 lda InputByte,x
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002114 1 48 pha
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002115 1 A9 1F lda #$1f ;set all flags high
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002117 1 9D 87 C0 sta OutputFlags,x
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00211A 1 finishRead:
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00211A 1 BD 8B C0 lda InputFlags,x
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00211D 1 2A rol
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00211E 1 90 FA bcc finishRead
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002120 1 68 pla
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002121 1 18 clc ;success
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002122 1 end:
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002122 1 60 rts
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002123 1
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002123 1 SetCursor:
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002123 1 AD 7B 05 lda htab80 ;get horizontal location / 2
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002126 1 4A lsr
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002127 1 A8 tay
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002128 1 AD 55 C0 lda TextPage2
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00212B 1 90 03 bcc setChar
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00212D 1 AD 54 C0 lda TextPage1
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002130 1 setChar:
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002130 1 B1 28 lda (BasL),y
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002132 1 85 06 sta LastChar ; save so ClearCursor will pick it up
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002134 1 C9 E0 cmp #$e0
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002136 1 10 0C bpl lowerCase
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002138 1 C9 C0 cmp #$c0
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00213A 1 10 0D bpl upperCase
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00213C 1 C9 A0 cmp #$a0
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00213E 1 10 04 bpl symbol
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002140 1 C9 80 cmp #$80
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002142 1 10 0A bpl noop
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002144 1 symbol:
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002144 1 lowerCase:
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002144 1 invert:
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002144 1 49 80 eor #$80
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002146 1 4C 4E 21 jmp storeChar
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002149 1 upperCase:
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002149 1 29 1F and #$1f
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00214B 1 4C 4E 21 jmp storeChar
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00214E 1 noop:
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00214E 1 storeChar:
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00214E 1 91 28 sta (BasL),y
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002150 1 AD 54 C0 lda TextPage1
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002153 1 60 rts
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002154 1
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002154 1 ClearCursor:
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002154 1 AD 7B 05 lda htab80 ;get horizontal location / 2
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002157 1 4A lsr
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002158 1 A8 tay
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002159 1 AD 55 C0 lda TextPage2
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00215C 1 90 03 bcc restoreChar
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00215E 1 AD 54 C0 lda TextPage1
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002161 1 restoreChar:
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002161 1 A5 06 lda LastChar
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002163 1 91 28 sta (BasL),y
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002165 1 AD 54 C0 lda TextPage1
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002168 1 60 rts
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002168 1
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