ca65 V2.18 - N/A 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 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 76 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 D1 20 jsr SendByte 002050 1 A9 09 lda #ShellCommand 002052 1 20 D1 20 jsr SendByte 002055 1 20 61 20 jsr DumpOutput 002058 1 A9 00 lda #ResetCommand 00205A 1 20 D1 20 jsr SendByte 00205D 1 68 pla 00205E 1 85 06 sta LastChar 002060 1 60 rts 002061 1 002061 1 DumpOutput: 002061 1 20 EF 20 jsr GetByte 002064 1 C9 00 cmp #$00 002066 1 F0 26 beq endOutput 002068 1 48 pha 002069 1 20 61 21 jsr ClearCursor 00206C 1 68 pla 00206D 1 C9 48 cmp #'H' 00206F 1 F0 27 beq setColumn 002071 1 C9 56 cmp #'V' 002073 1 F0 31 beq setRow 002075 1 C9 43 cmp #'C' 002077 1 F0 16 beq clearScreen 002079 1 C9 54 cmp #'T' 00207B 1 F0 37 beq setTop 00207D 1 C9 42 cmp #'B' 00207F 1 F0 3B beq setBottom 002081 1 C9 55 cmp #'U' 002083 1 F0 3F beq moveUp 002085 1 20 ED FD jsr PrintChar 002088 1 20 30 21 jsr SetCursor 00208B 1 4C 61 20 jmp DumpOutput 00208E 1 endOutput: 00208E 1 60 rts 00208F 1 clearScreen: 00208F 1 20 58 FC jsr Home 002092 1 20 30 21 jsr SetCursor 002095 1 4C 61 20 jmp DumpOutput 002098 1 setColumn: 002098 1 20 EF 20 jsr GetByte 00209B 1 85 24 sta htab 00209D 1 8D 7B 05 sta htab80 0020A0 1 20 30 21 jsr SetCursor 0020A3 1 4C 61 20 jmp DumpOutput 0020A6 1 setRow: 0020A6 1 20 EF 20 jsr GetByte 0020A9 1 85 25 sta vtab 0020AB 1 20 C1 FB jsr BasCalc 0020AE 1 20 30 21 jsr SetCursor 0020B1 1 4C 61 20 jmp DumpOutput 0020B4 1 setTop: 0020B4 1 20 EF 20 jsr GetByte 0020B7 1 85 22 sta $22 0020B9 1 4C 61 20 jmp DumpOutput 0020BC 1 setBottom: 0020BC 1 20 EF 20 jsr GetByte 0020BF 1 85 23 sta $23 0020C1 1 4C 61 20 jmp DumpOutput 0020C4 1 moveUp: 0020C4 1 C6 25 dec vtab 0020C6 1 A5 25 lda vtab 0020C8 1 20 C1 FB jsr BasCalc 0020CB 1 20 30 21 jsr SetCursor 0020CE 1 4C 61 20 jmp DumpOutput 0020D1 1 0020D1 1 SendByte: 0020D1 1 48 pha 0020D2 1 waitWrite: 0020D2 1 BD 8B C0 lda InputFlags,x 0020D5 1 2A rol 0020D6 1 2A rol 0020D7 1 B0 F9 bcs waitWrite 0020D9 1 68 pla 0020DA 1 9D 8D C0 sta OutputByte,x 0020DD 1 A9 1E lda #$1e ; set bit 0 low to indicate write started 0020DF 1 9D 87 C0 sta OutputFlags,x 0020E2 1 finishWrite: 0020E2 1 BD 8B C0 lda InputFlags,x 0020E5 1 2A rol 0020E6 1 2A rol 0020E7 1 90 F9 bcc finishWrite 0020E9 1 A9 1F lda #$1f 0020EB 1 9D 87 C0 sta OutputFlags,x 0020EE 1 60 rts 0020EF 1 0020EF 1 GetByte: 0020EF 1 A9 1D lda #$1d ;set read flag low 0020F1 1 9D 87 C0 sta OutputFlags,x 0020F4 1 waitRead: 0020F4 1 BD 8B C0 lda InputFlags,x 0020F7 1 2A rol 0020F8 1 90 24 bcc readByte 0020FA 1 2C 00 C0 bit Keyboard ;keypress will abort waiting to read 0020FD 1 10 F5 bpl waitRead 0020FF 1 keyPressed: 0020FF 1 AD 00 C0 lda Keyboard ;send keypress to RPi 002102 1 29 7F and #$7f 002104 1 9D 8D C0 sta OutputByte,x 002107 1 2C 10 C0 bit ClearKeyboard 00210A 1 A9 1C lda #$1c ;set write flag low too 00210C 1 9D 87 C0 sta OutputFlags,x 00210F 1 finishKeyPress: 00210F 1 BD 8B C0 lda InputFlags,x 002112 1 2A rol 002113 1 2A rol 002114 1 90 F9 bcc finishKeyPress 002116 1 A9 1D lda #$1d ;set flags back for reading 002118 1 9D 87 C0 sta OutputFlags,x 00211B 1 4C F4 20 jmp waitRead 00211E 1 readByte: 00211E 1 BD 8E C0 lda InputByte,x 002121 1 48 pha 002122 1 A9 1F lda #$1f ;set all flags high 002124 1 9D 87 C0 sta OutputFlags,x 002127 1 finishRead: 002127 1 BD 8B C0 lda InputFlags,x 00212A 1 2A rol 00212B 1 90 FA bcc finishRead 00212D 1 68 pla 00212E 1 18 clc ;success 00212F 1 end: 00212F 1 60 rts 002130 1 002130 1 SetCursor: 002130 1 AD 7B 05 lda htab80 ;get horizontal location / 2 002133 1 4A lsr 002134 1 A8 tay 002135 1 AD 55 C0 lda TextPage2 002138 1 90 03 bcc setChar 00213A 1 AD 54 C0 lda TextPage1 00213D 1 setChar: 00213D 1 B1 28 lda (BasL),y 00213F 1 85 06 sta LastChar ; save so ClearCursor will pick it up 002141 1 C9 E0 cmp #$e0 002143 1 10 0C bpl lowerCase 002145 1 C9 C0 cmp #$c0 002147 1 10 0D bpl upperCase 002149 1 C9 A0 cmp #$a0 00214B 1 10 04 bpl symbol 00214D 1 C9 80 cmp #$80 00214F 1 10 0A bpl noop 002151 1 symbol: 002151 1 lowerCase: 002151 1 invert: 002151 1 49 80 eor #$80 002153 1 4C 5B 21 jmp storeChar 002156 1 upperCase: 002156 1 29 1F and #$1f 002158 1 4C 5B 21 jmp storeChar 00215B 1 noop: 00215B 1 storeChar: 00215B 1 91 28 sta (BasL),y 00215D 1 AD 54 C0 lda TextPage1 002160 1 60 rts 002161 1 002161 1 ClearCursor: 002161 1 AD 7B 05 lda htab80 ;get horizontal location / 2 002164 1 4A lsr 002165 1 A8 tay 002166 1 AD 55 C0 lda TextPage2 002169 1 90 03 bcc restoreChar 00216B 1 AD 54 C0 lda TextPage1 00216E 1 restoreChar: 00216E 1 A5 06 lda LastChar 002170 1 91 28 sta (BasL),y 002172 1 AD 54 C0 lda TextPage1 002175 1 60 rts 002176 1 002176 1 Text: 002176 1 41 70 70 6C .byte "Apple2-IO-RPi Shell Version 000D",$8d 00217A 1 65 32 2D 49 00217E 1 4F 2D 52 50 002197 1 28 63 29 32 .byte "(c)2020-2022 Terence J. Boldt",$8d 00219B 1 30 32 30 2D 00219F 1 32 30 32 32 0021B5 1 8D .byte $8d 0021B6 1 00 .byte $00 0021B6 1