ca65 V2.17 - Raspbian 2.17-1 Main file : Shell.asm Current file: Shell.asm 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 ; hard code slot to 7 for now, will make it auto-detect later 000000r 1 SLOT = 7 000000r 1 000000r 1 InputByte = $c08e+SLOT*$10 000000r 1 OutputByte = $c08d+SLOT*$10 000000r 1 InputFlags = $c08b+SLOT*$10 000000r 1 OutputFlags = $c087+SLOT*$10 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 000000r 1 ESC = $9b 000000r 1 000000r 1 .org $2000 002000 1 Start: 002000 1 20 00 C3 jsr $c300 ; force 80 columns 002003 1 A5 06 lda LastChar 002005 1 48 pha 002006 1 2C 10 C0 bit ClearKeyboard 002009 1 A9 00 lda #ResetCommand 00200B 1 20 9F 20 jsr SendByte 00200E 1 A9 09 lda #ShellCommand 002010 1 20 9F 20 jsr SendByte 002013 1 20 1A 20 jsr DumpOutput 002016 1 68 pla 002017 1 85 06 sta LastChar 002019 1 60 rts 00201A 1 00201A 1 DumpOutput: 00201A 1 20 BD 20 jsr GetByte 00201D 1 B0 2A bcs checkInput 00201F 1 C9 00 cmp #$00 002021 1 F0 39 beq endOutput 002023 1 48 pha 002024 1 20 1C 21 jsr ClearCursor 002027 1 68 pla 002028 1 C9 48 cmp #'H' 00202A 1 F0 3A beq setColumn 00202C 1 C9 56 cmp #'V' 00202E 1 F0 44 beq setRow 002030 1 C9 43 cmp #'C' 002032 1 F0 29 beq clearScreen 002034 1 C9 54 cmp #'T' 002036 1 F0 4A beq setTop 002038 1 C9 42 cmp #'B' 00203A 1 F0 4E beq setBottom 00203C 1 C9 55 cmp #'U' 00203E 1 F0 52 beq moveUp 002040 1 20 ED FD jsr PrintChar 002043 1 20 EB 20 jsr SetCursor 002046 1 4C 1A 20 jmp DumpOutput 002049 1 checkInput: 002049 1 2C 00 C0 bit Keyboard ;check for keypress 00204C 1 10 CC bpl DumpOutput ;keep dumping output if no keypress 00204E 1 AD 00 C0 lda Keyboard ;send keypress to RPi 002051 1 29 7F and #$7f 002053 1 20 9F 20 jsr SendByte 002056 1 2C 10 C0 bit ClearKeyboard 002059 1 4C 1A 20 jmp DumpOutput 00205C 1 endOutput: 00205C 1 60 rts 00205D 1 clearScreen: 00205D 1 20 58 FC jsr Home 002060 1 20 EB 20 jsr SetCursor 002063 1 4C 1A 20 jmp DumpOutput 002066 1 setColumn: 002066 1 20 BD 20 jsr GetByte 002069 1 85 24 sta htab 00206B 1 8D 7B 05 sta htab80 00206E 1 20 EB 20 jsr SetCursor 002071 1 4C 1A 20 jmp DumpOutput 002074 1 setRow: 002074 1 20 BD 20 jsr GetByte 002077 1 85 25 sta vtab 002079 1 20 C1 FB jsr BasCalc 00207C 1 20 EB 20 jsr SetCursor 00207F 1 4C 1A 20 jmp DumpOutput 002082 1 setTop: 002082 1 20 BD 20 jsr GetByte 002085 1 85 22 sta $22 002087 1 4C 1A 20 jmp DumpOutput 00208A 1 setBottom: 00208A 1 20 BD 20 jsr GetByte 00208D 1 85 23 sta $23 00208F 1 4C 1A 20 jmp DumpOutput 002092 1 moveUp: 002092 1 C6 25 dec vtab 002094 1 A5 25 lda vtab 002096 1 20 C1 FB jsr BasCalc 002099 1 20 EB 20 jsr SetCursor 00209C 1 4C 1A 20 jmp DumpOutput 00209F 1 00209F 1 SendByte: 00209F 1 48 pha 0020A0 1 waitWrite: 0020A0 1 AD FB C0 lda InputFlags 0020A3 1 2A rol 0020A4 1 2A rol 0020A5 1 B0 F9 bcs waitWrite 0020A7 1 68 pla 0020A8 1 8D FD C0 sta OutputByte 0020AB 1 A9 1E lda #$1e ; set bit 0 low to indicate write started 0020AD 1 8D F7 C0 sta OutputFlags 0020B0 1 finishWrite: 0020B0 1 AD FB C0 lda InputFlags 0020B3 1 2A rol 0020B4 1 2A rol 0020B5 1 90 F9 bcc finishWrite 0020B7 1 A9 1F lda #$1f 0020B9 1 8D F7 C0 sta OutputFlags 0020BC 1 60 rts 0020BD 1 0020BD 1 GetByte: 0020BD 1 2C 00 C0 bit Keyboard ; skip byte read if key pressed 0020C0 1 90 10 bcc keyPressed 0020C2 1 A9 1D lda #$1d ;set read flag low 0020C4 1 8D F7 C0 sta OutputFlags 0020C7 1 waitRead: 0020C7 1 AD FB C0 lda InputFlags 0020CA 1 2A rol 0020CB 1 90 0C bcc readByte 0020CD 1 2C 00 C0 bit Keyboard ;keypress will abort waiting to read 0020D0 1 10 F5 bpl waitRead 0020D2 1 keyPressed: 0020D2 1 A9 1F lda #$1f ;set all flags high and exit 0020D4 1 8D F7 C0 sta OutputFlags 0020D7 1 38 sec ;failure 0020D8 1 60 rts 0020D9 1 readByte: 0020D9 1 AD FE C0 lda InputByte 0020DC 1 48 pha 0020DD 1 A9 1F lda #$1f ;set all flags high 0020DF 1 8D F7 C0 sta OutputFlags 0020E2 1 finishRead: 0020E2 1 AD FB C0 lda InputFlags 0020E5 1 2A rol 0020E6 1 90 FA bcc finishRead 0020E8 1 68 pla 0020E9 1 18 clc ;success 0020EA 1 end: 0020EA 1 60 rts 0020EB 1 0020EB 1 SetCursor: 0020EB 1 AD 7B 05 lda htab80 ;get horizontal location / 2 0020EE 1 4A lsr 0020EF 1 A8 tay 0020F0 1 AD 55 C0 lda TextPage2 0020F3 1 90 03 bcc setChar 0020F5 1 AD 54 C0 lda TextPage1 0020F8 1 setChar: 0020F8 1 B1 28 lda (BasL),y 0020FA 1 85 06 sta LastChar ; save so ClearCursor will pick it up 0020FC 1 C9 E0 cmp #$e0 0020FE 1 10 0C bpl lowerCase 002100 1 C9 C0 cmp #$c0 002102 1 10 0D bpl upperCase 002104 1 C9 A0 cmp #$a0 002106 1 10 04 bpl symbol 002108 1 C9 80 cmp #$80 00210A 1 10 0A bpl noop 00210C 1 symbol: 00210C 1 lowerCase: 00210C 1 invert: 00210C 1 49 80 eor #$80 00210E 1 4C 16 21 jmp storeChar 002111 1 upperCase: 002111 1 29 1F and #$1f 002113 1 4C 16 21 jmp storeChar 002116 1 noop: 002116 1 storeChar: 002116 1 91 28 sta (BasL),y 002118 1 AD 54 C0 lda TextPage1 00211B 1 60 rts 00211C 1 00211C 1 ClearCursor: 00211C 1 AD 7B 05 lda htab80 ;get horizontal location / 2 00211F 1 4A lsr 002120 1 A8 tay 002121 1 AD 55 C0 lda TextPage2 002124 1 90 03 bcc restoreChar 002126 1 AD 54 C0 lda TextPage1 002129 1 restoreChar: 002129 1 A5 06 lda LastChar 00212B 1 91 28 sta (BasL),y 00212D 1 AD 54 C0 lda TextPage1 002130 1 60 rts 002130 1