Apple-2-HW/Apple2-IO-RPi
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Apple2-IO-RPi/Apple2/Shell.lst
Terence Boldt ad6d103cca
Fix hang after shell exit (#131)
2023-01-30 20:45:24 -05:00

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ca65 V2.18 - N/A
Main file : Shell.asm
Current file: Shell.asm
000000r 1 ; Copyright Terence J. Boldt (c)2021-2023
000000r 1 ; Use of this source code is governed by an MIT
000000r 1 ; license that can be found in the LICENSE file.
000000r 1
000000r 1 ; This file contains the source for the SHELL
000000r 1 ; application that runs on the Apple II to talk
000000r 1 ; to the Raspberry Pi
000000r 1
000000r 1 ;ProDOS Zero Page
000000r 1 Command = $42 ;ProDOS Command
000000r 1 Unit = $43 ;ProDOS unit (SDDD0000)
000000r 1 BufferLo = $44
000000r 1 BufferHi = $45
000000r 1 BlockLo = $46
000000r 1 BlockHi = $47
000000r 1
000000r 1 ; ProDOS Error Codes
000000r 1 IOError = $27
000000r 1 NoDevice = $28
000000r 1 WriteProtect = $2B
000000r 1
000000r 1 InputByte = $c08e
000000r 1 OutputByte = $c08d
000000r 1 InputFlags = $c08b
000000r 1 OutputFlags = $c087
000000r 1
000000r 1 ResetCommand = $00
000000r 1 ReadBlockCommand = $01
000000r 1 WriteBlockCommand = $02
000000r 1 GetTimeCommand = $03
000000r 1 ChangeDriveCommand = $04
000000r 1 ExecCommand = $05
000000r 1 LoadFileCommand = $06
000000r 1 SaveFileCommand = $07
000000r 1 MenuCommand = $08
000000r 1 ShellCommand = $09
000000r 1
000000r 1 InputString = $fd6a
000000r 1 StringBuffer = $0200
000000r 1 PrintChar = $fded
000000r 1 Keyboard = $c000
000000r 1 ClearKeyboard = $c010
000000r 1 Home = $fc58
000000r 1 Wait = $fca8
000000r 1 PromptChar = $33
000000r 1 Read80Col = $c01f
000000r 1 TextPage1 = $c054
000000r 1 TextPage2 = $c055
000000r 1
000000r 1 htab = $24
000000r 1 vtab = $25
000000r 1 BasL = $28
000000r 1 htab80 = $057b
000000r 1 BasCalc = $fbc1
000000r 1
000000r 1 LastChar = $06
000000r 1 SlotL = $fe
000000r 1 SlotH = $ff
000000r 1 ESC = $9b
000000r 1
000000r 1 .org $2000
002000 1 A2 07 ldx #$07 ; start at slot 7
002002 1 DetectSlot:
002002 1 A0 00 ldy #$00
002004 1 A9 FC lda #$fc
002006 1 85 FE sta SlotL
002008 1 8A txa
002009 1 09 C0 ora #$c0
00200B 1 85 FF sta SlotH
00200D 1 B1 FE lda (SlotL),y
00200F 1 D0 1C bne nextSlot
002011 1 C8 iny
002012 1 B1 FE lda (SlotL),y
002014 1 D0 17 bne nextSlot
002016 1 C8 iny
002017 1 B1 FE lda (SlotL),y
002019 1 C9 17 cmp #$17
00201B 1 D0 10 bne nextSlot
00201D 1 C8 iny
00201E 1 B1 FE lda (SlotL),y
002020 1 C9 14 cmp #$14
002022 1 D0 09 bne nextSlot
002024 1 8A txa
002025 1 0A asl
002026 1 0A asl
002027 1 0A asl
002028 1 0A asl
002029 1 AA tax
00202A 1 18 clc
00202B 1 90 04 bcc Init
00202D 1 nextSlot:
00202D 1 CA dex
00202E 1 D0 D2 bne DetectSlot
002030 1 60 rts
002031 1
002031 1 Init:
002031 1 A9 8D lda #$8d
002033 1 20 00 C3 jsr $c300 ; force 80 columns
002036 1
002036 1 A0 00 ldy #$00
002038 1 PrintString:
002038 1 B9 71 21 lda Text,y
00203B 1 F0 08 beq Start
00203D 1 09 80 ora #$80
00203F 1 20 ED FD jsr PrintChar
002042 1 C8 iny
002043 1 D0 F3 bne PrintString
002045 1
002045 1 Start:
002045 1 A5 06 lda LastChar
002047 1 48 pha
002048 1 2C 10 C0 bit ClearKeyboard
00204B 1 A9 00 lda #ResetCommand
00204D 1 20 CC 20 jsr SendByte
002050 1 A9 09 lda #ShellCommand
002052 1 20 CC 20 jsr SendByte
002055 1 20 5C 20 jsr DumpOutput
002058 1 68 pla
002059 1 85 06 sta LastChar
00205B 1 60 rts
00205C 1
00205C 1 DumpOutput:
00205C 1 20 EA 20 jsr GetByte
00205F 1 C9 00 cmp #$00
002061 1 F0 26 beq endOutput
002063 1 48 pha
002064 1 20 5C 21 jsr ClearCursor
002067 1 68 pla
002068 1 C9 48 cmp #'H'
00206A 1 F0 27 beq setColumn
00206C 1 C9 56 cmp #'V'
00206E 1 F0 31 beq setRow
002070 1 C9 43 cmp #'C'
002072 1 F0 16 beq clearScreen
002074 1 C9 54 cmp #'T'
002076 1 F0 37 beq setTop
002078 1 C9 42 cmp #'B'
00207A 1 F0 3B beq setBottom
00207C 1 C9 55 cmp #'U'
00207E 1 F0 3F beq moveUp
002080 1 20 ED FD jsr PrintChar
002083 1 20 2B 21 jsr SetCursor
002086 1 4C 5C 20 jmp DumpOutput
002089 1 endOutput:
002089 1 60 rts
00208A 1 clearScreen:
00208A 1 20 58 FC jsr Home
00208D 1 20 2B 21 jsr SetCursor
002090 1 4C 5C 20 jmp DumpOutput
002093 1 setColumn:
002093 1 20 EA 20 jsr GetByte
002096 1 85 24 sta htab
002098 1 8D 7B 05 sta htab80
00209B 1 20 2B 21 jsr SetCursor
00209E 1 4C 5C 20 jmp DumpOutput
0020A1 1 setRow:
0020A1 1 20 EA 20 jsr GetByte
0020A4 1 85 25 sta vtab
0020A6 1 20 C1 FB jsr BasCalc
0020A9 1 20 2B 21 jsr SetCursor
0020AC 1 4C 5C 20 jmp DumpOutput
0020AF 1 setTop:
0020AF 1 20 EA 20 jsr GetByte
0020B2 1 85 22 sta $22
0020B4 1 4C 5C 20 jmp DumpOutput
0020B7 1 setBottom:
0020B7 1 20 EA 20 jsr GetByte
0020BA 1 85 23 sta $23
0020BC 1 4C 5C 20 jmp DumpOutput
0020BF 1 moveUp:
0020BF 1 C6 25 dec vtab
0020C1 1 A5 25 lda vtab
0020C3 1 20 C1 FB jsr BasCalc
0020C6 1 20 2B 21 jsr SetCursor
0020C9 1 4C 5C 20 jmp DumpOutput
0020CC 1
0020CC 1 SendByte:
0020CC 1 48 pha
0020CD 1 waitWrite:
0020CD 1 BD 8B C0 lda InputFlags,x
0020D0 1 2A rol
0020D1 1 2A rol
0020D2 1 B0 F9 bcs waitWrite
0020D4 1 68 pla
0020D5 1 9D 8D C0 sta OutputByte,x
0020D8 1 A9 1E lda #$1e ; set bit 0 low to indicate write started
0020DA 1 9D 87 C0 sta OutputFlags,x
0020DD 1 finishWrite:
0020DD 1 BD 8B C0 lda InputFlags,x
0020E0 1 2A rol
0020E1 1 2A rol
0020E2 1 90 F9 bcc finishWrite
0020E4 1 A9 1F lda #$1f
0020E6 1 9D 87 C0 sta OutputFlags,x
0020E9 1 60 rts
0020EA 1
0020EA 1 GetByte:
0020EA 1 A9 1D lda #$1d ;set read flag low
0020EC 1 9D 87 C0 sta OutputFlags,x
0020EF 1 waitRead:
0020EF 1 BD 8B C0 lda InputFlags,x
0020F2 1 2A rol
0020F3 1 90 24 bcc readByte
0020F5 1 2C 00 C0 bit Keyboard ;keypress will abort waiting to read
0020F8 1 10 F5 bpl waitRead
0020FA 1 keyPressed:
0020FA 1 AD 00 C0 lda Keyboard ;send keypress to RPi
0020FD 1 29 7F and #$7f
0020FF 1 9D 8D C0 sta OutputByte,x
002102 1 2C 10 C0 bit ClearKeyboard
002105 1 A9 1C lda #$1c ;set write flag low too
002107 1 9D 87 C0 sta OutputFlags,x
00210A 1 finishKeyPress:
00210A 1 BD 8B C0 lda InputFlags,x
00210D 1 2A rol
00210E 1 2A rol
00210F 1 90 F9 bcc finishKeyPress
002111 1 A9 1D lda #$1d ;set flags back for reading
002113 1 9D 87 C0 sta OutputFlags,x
002116 1 4C EF 20 jmp waitRead
002119 1 readByte:
002119 1 BD 8E C0 lda InputByte,x
00211C 1 48 pha
00211D 1 A9 1F lda #$1f ;set all flags high
00211F 1 9D 87 C0 sta OutputFlags,x
002122 1 finishRead:
002122 1 BD 8B C0 lda InputFlags,x
002125 1 2A rol
002126 1 90 FA bcc finishRead
002128 1 68 pla
002129 1 18 clc ;success
00212A 1 end:
00212A 1 60 rts
00212B 1
00212B 1 SetCursor:
00212B 1 AD 7B 05 lda htab80 ;get horizontal location / 2
00212E 1 4A lsr
00212F 1 A8 tay
002130 1 AD 55 C0 lda TextPage2
002133 1 90 03 bcc setChar
002135 1 AD 54 C0 lda TextPage1
002138 1 setChar:
002138 1 B1 28 lda (BasL),y
00213A 1 85 06 sta LastChar ; save so ClearCursor will pick it up
00213C 1 C9 E0 cmp #$e0
00213E 1 10 0C bpl lowerCase
002140 1 C9 C0 cmp #$c0
002142 1 10 0D bpl upperCase
002144 1 C9 A0 cmp #$a0
002146 1 10 04 bpl symbol
002148 1 C9 80 cmp #$80
00214A 1 10 0A bpl noop
00214C 1 symbol:
00214C 1 lowerCase:
00214C 1 invert:
00214C 1 49 80 eor #$80
00214E 1 4C 56 21 jmp storeChar
002151 1 upperCase:
002151 1 29 1F and #$1f
002153 1 4C 56 21 jmp storeChar
002156 1 noop:
002156 1 storeChar:
002156 1 91 28 sta (BasL),y
002158 1 AD 54 C0 lda TextPage1
00215B 1 60 rts
00215C 1
00215C 1 ClearCursor:
00215C 1 AD 7B 05 lda htab80 ;get horizontal location / 2
00215F 1 4A lsr
002160 1 A8 tay
002161 1 AD 55 C0 lda TextPage2
002164 1 90 03 bcc restoreChar
002166 1 AD 54 C0 lda TextPage1
002169 1 restoreChar:
002169 1 A5 06 lda LastChar
00216B 1 91 28 sta (BasL),y
00216D 1 AD 54 C0 lda TextPage1
002170 1 60 rts
002171 1
002171 1 Text:
002171 1 41 70 70 6C .byte "Apple2-IO-RPi Shell Version 000E",$8d
002175 1 65 32 2D 49
002179 1 4F 2D 52 50
002192 1 28 63 29 32 .byte "(c)2020-2023 Terence J. Boldt",$8d
002196 1 30 32 30 2D
00219A 1 32 30 32 33
0021B0 1 8D .byte $8d
0021B1 1 00 .byte $00
0021B1 1
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