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