Apple-2-HW/Apple2-IO-RPi
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Apple2-IO-RPi/Apple2/Shell.lst
Terence Boldt 049e8770d2 Fix keyboard input glitch on read
2022-02-23 22:42:19 -05:00

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ca65 V2.18 - Raspbian 2.19-1
Main file : Shell.asm
Current file: Shell.asm
000000r 1 ; Copyright Terence J. Boldt (c)2021-2022
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 Start
00202D 1 nextSlot:
00202D 1 CA dex
00202E 1 D0 D2 bne DetectSlot
002030 1 60 rts
002031 1 Start:
002031 1 A9 8D lda #$8d
002033 1 20 00 C3 jsr $c300 ; force 80 columns
002036 1 A5 06 lda LastChar
002038 1 48 pha
002039 1 2C 10 C0 bit ClearKeyboard
00203C 1 A9 00 lda #ResetCommand
00203E 1 20 C2 20 jsr SendByte
002041 1 A9 09 lda #ShellCommand
002043 1 20 C2 20 jsr SendByte
002046 1 20 52 20 jsr DumpOutput
002049 1 A9 00 lda #ResetCommand
00204B 1 20 C2 20 jsr SendByte
00204E 1 68 pla
00204F 1 85 06 sta LastChar
002051 1 60 rts
002052 1
002052 1 DumpOutput:
002052 1 20 E0 20 jsr GetByte
002055 1 C9 00 cmp #$00
002057 1 F0 26 beq endOutput
002059 1 48 pha
00205A 1 20 52 21 jsr ClearCursor
00205D 1 68 pla
00205E 1 C9 48 cmp #'H'
002060 1 F0 27 beq setColumn
002062 1 C9 56 cmp #'V'
002064 1 F0 31 beq setRow
002066 1 C9 43 cmp #'C'
002068 1 F0 16 beq clearScreen
00206A 1 C9 54 cmp #'T'
00206C 1 F0 37 beq setTop
00206E 1 C9 42 cmp #'B'
002070 1 F0 3B beq setBottom
002072 1 C9 55 cmp #'U'
002074 1 F0 3F beq moveUp
002076 1 20 ED FD jsr PrintChar
002079 1 20 21 21 jsr SetCursor
00207C 1 4C 52 20 jmp DumpOutput
00207F 1 endOutput:
00207F 1 60 rts
002080 1 clearScreen:
002080 1 20 58 FC jsr Home
002083 1 20 21 21 jsr SetCursor
002086 1 4C 52 20 jmp DumpOutput
002089 1 setColumn:
002089 1 20 E0 20 jsr GetByte
00208C 1 85 24 sta htab
00208E 1 8D 7B 05 sta htab80
002091 1 20 21 21 jsr SetCursor
002094 1 4C 52 20 jmp DumpOutput
002097 1 setRow:
002097 1 20 E0 20 jsr GetByte
00209A 1 85 25 sta vtab
00209C 1 20 C1 FB jsr BasCalc
00209F 1 20 21 21 jsr SetCursor
0020A2 1 4C 52 20 jmp DumpOutput
0020A5 1 setTop:
0020A5 1 20 E0 20 jsr GetByte
0020A8 1 85 22 sta $22
0020AA 1 4C 52 20 jmp DumpOutput
0020AD 1 setBottom:
0020AD 1 20 E0 20 jsr GetByte
0020B0 1 85 23 sta $23
0020B2 1 4C 52 20 jmp DumpOutput
0020B5 1 moveUp:
0020B5 1 C6 25 dec vtab
0020B7 1 A5 25 lda vtab
0020B9 1 20 C1 FB jsr BasCalc
0020BC 1 20 21 21 jsr SetCursor
0020BF 1 4C 52 20 jmp DumpOutput
0020C2 1
0020C2 1 SendByte:
0020C2 1 48 pha
0020C3 1 waitWrite:
0020C3 1 BD 8B C0 lda InputFlags,x
0020C6 1 2A rol
0020C7 1 2A rol
0020C8 1 B0 F9 bcs waitWrite
0020CA 1 68 pla
0020CB 1 9D 8D C0 sta OutputByte,x
0020CE 1 A9 1E lda #$1e ; set bit 0 low to indicate write started
0020D0 1 9D 87 C0 sta OutputFlags,x
0020D3 1 finishWrite:
0020D3 1 BD 8B C0 lda InputFlags,x
0020D6 1 2A rol
0020D7 1 2A rol
0020D8 1 90 F9 bcc finishWrite
0020DA 1 A9 1F lda #$1f
0020DC 1 9D 87 C0 sta OutputFlags,x
0020DF 1 60 rts
0020E0 1
0020E0 1 GetByte:
0020E0 1 A9 1D lda #$1d ;set read flag low
0020E2 1 9D 87 C0 sta OutputFlags,x
0020E5 1 waitRead:
0020E5 1 BD 8B C0 lda InputFlags,x
0020E8 1 2A rol
0020E9 1 90 24 bcc readByte
0020EB 1 2C 00 C0 bit Keyboard ;keypress will abort waiting to read
0020EE 1 10 F5 bpl waitRead
0020F0 1 keyPressed:
0020F0 1 AD 00 C0 lda Keyboard ;send keypress to RPi
0020F3 1 29 7F and #$7f
0020F5 1 9D 8D C0 sta OutputByte,x
0020F8 1 2C 10 C0 bit ClearKeyboard
0020FB 1 A9 1C lda #$1c ;set write flag low too
0020FD 1 9D 87 C0 sta OutputFlags,x
002100 1 finishKeyPress:
002100 1 BD 8B C0 lda InputFlags,x
002103 1 2A rol
002104 1 2A rol
002105 1 90 F9 bcc finishKeyPress
002107 1 A9 1D lda #$1d ;set flags back for reading
002109 1 9D 87 C0 sta OutputFlags,x
00210C 1 4C E5 20 jmp waitRead
00210F 1 readByte:
00210F 1 BD 8E C0 lda InputByte,x
002112 1 48 pha
002113 1 A9 1F lda #$1f ;set all flags high
002115 1 9D 87 C0 sta OutputFlags,x
002118 1 finishRead:
002118 1 BD 8B C0 lda InputFlags,x
00211B 1 2A rol
00211C 1 90 FA bcc finishRead
00211E 1 68 pla
00211F 1 18 clc ;success
002120 1 end:
002120 1 60 rts
002121 1
002121 1 SetCursor:
002121 1 AD 7B 05 lda htab80 ;get horizontal location / 2
002124 1 4A lsr
002125 1 A8 tay
002126 1 AD 55 C0 lda TextPage2
002129 1 90 03 bcc setChar
00212B 1 AD 54 C0 lda TextPage1
00212E 1 setChar:
00212E 1 B1 28 lda (BasL),y
002130 1 85 06 sta LastChar ; save so ClearCursor will pick it up
002132 1 C9 E0 cmp #$e0
002134 1 10 0C bpl lowerCase
002136 1 C9 C0 cmp #$c0
002138 1 10 0D bpl upperCase
00213A 1 C9 A0 cmp #$a0
00213C 1 10 04 bpl symbol
00213E 1 C9 80 cmp #$80
002140 1 10 0A bpl noop
002142 1 symbol:
002142 1 lowerCase:
002142 1 invert:
002142 1 49 80 eor #$80
002144 1 4C 4C 21 jmp storeChar
002147 1 upperCase:
002147 1 29 1F and #$1f
002149 1 4C 4C 21 jmp storeChar
00214C 1 noop:
00214C 1 storeChar:
00214C 1 91 28 sta (BasL),y
00214E 1 AD 54 C0 lda TextPage1
002151 1 60 rts
002152 1
002152 1 ClearCursor:
002152 1 AD 7B 05 lda htab80 ;get horizontal location / 2
002155 1 4A lsr
002156 1 A8 tay
002157 1 AD 55 C0 lda TextPage2
00215A 1 90 03 bcc restoreChar
00215C 1 AD 54 C0 lda TextPage1
00215F 1 restoreChar:
00215F 1 A5 06 lda LastChar
002161 1 91 28 sta (BasL),y
002163 1 AD 54 C0 lda TextPage1
002166 1 60 rts
002166 1
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