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 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 000000r 1 InputString = $fd6a 000000r 1 StringBuffer = $0200 000000r 1 PrintChar = $fded 000000r 1 Keyboard = $c000 000000r 1 ClearKeyboard = $c010 000000r 1 Wait = $fca8 000000r 1 PromptChar = $33 000000r 1 000000r 1 ESC = $9b 000000r 1 000000r 1 .org $2000 002000 1 Start: 002000 1 A5 33 lda PromptChar 002002 1 8D 20 21 sta OldPromptChar 002005 1 A9 A4 lda #'$'|$80 002007 1 85 33 sta PromptChar 002009 1 A9 05 lda #ExecCommand 00200B 1 20 C9 20 jsr SendByte 00200E 1 A2 00 ldx #$00 002010 1 sendHelpCommand: 002010 1 BD 10 21 lda HelpCommand,x 002013 1 C9 00 cmp #$00 002015 1 F0 06 beq sendHelpCommandEnd 002017 1 20 C9 20 jsr SendByte 00201A 1 E8 inx 00201B 1 10 F3 bpl sendHelpCommand 00201D 1 sendHelpCommandEnd: 00201D 1 A9 00 lda #$00 00201F 1 20 C9 20 jsr SendByte 002022 1 2C 10 C0 bit ClearKeyboard 002025 1 20 90 20 jsr DumpOutput 002028 1 002028 1 Prompt: 002028 1 A9 05 lda #ExecCommand 00202A 1 20 C9 20 jsr SendByte 00202D 1 A2 00 ldx #$00 00202F 1 sendPromptCommand: 00202F 1 BD 17 21 lda PromptCommand,x 002032 1 C9 00 cmp #$00 002034 1 F0 06 beq sendPromptCommandEnd 002036 1 20 C9 20 jsr SendByte 002039 1 E8 inx 00203A 1 10 F3 bpl sendPromptCommand 00203C 1 sendPromptCommandEnd: 00203C 1 A9 00 lda #$00 00203E 1 20 C9 20 jsr SendByte 002041 1 2C 10 C0 bit ClearKeyboard 002044 1 20 90 20 jsr DumpOutput 002047 1 002047 1 ; get input 002047 1 20 6A FD jsr InputString 00204A 1 ; check for "exit" 00204A 1 AD 00 02 lda StringBuffer 00204D 1 C9 E5 cmp #'e'|$80 00204F 1 D0 1B bne Execute 002051 1 AD 01 02 lda StringBuffer+1 002054 1 C9 F8 cmp #'x'|$80 002056 1 D0 14 bne Execute 002058 1 AD 02 02 lda StringBuffer+2 00205B 1 C9 E9 cmp #'i'|$80 00205D 1 D0 0D bne Execute 00205F 1 AD 03 02 lda StringBuffer+3 002062 1 C9 F4 cmp #'t'|$80 002064 1 D0 06 bne Execute 002066 1 AD 20 21 lda OldPromptChar 002069 1 85 33 sta PromptChar 00206B 1 60 rts 00206C 1 Execute: 00206C 1 2C 10 C0 bit ClearKeyboard 00206F 1 A9 05 lda #ExecCommand 002071 1 20 C9 20 jsr SendByte 002074 1 A0 00 ldy #$00 002076 1 sendInput: 002076 1 B9 00 02 lda $0200,y 002079 1 C9 8D cmp #$8d 00207B 1 F0 08 beq sendNullTerminator 00207D 1 29 7F and #$7f 00207F 1 20 C9 20 jsr SendByte 002082 1 C8 iny 002083 1 D0 F1 bne sendInput 002085 1 sendNullTerminator: 002085 1 A9 00 lda #$00 002087 1 20 C9 20 jsr SendByte 00208A 1 20 90 20 jsr DumpOutput 00208D 1 4C 28 20 jmp Prompt 002090 1 002090 1 DumpOutput: 002090 1 20 E7 20 jsr GetByte 002093 1 B0 0B bcs skipOutput 002095 1 C9 00 cmp #$00 002097 1 F0 1A beq endOutput 002099 1 C9 9B cmp #ESC 00209B 1 F0 17 beq escapeSequence 00209D 1 20 ED FD jsr PrintChar 0020A0 1 skipOutput: 0020A0 1 2C 00 C0 bit Keyboard ;check for keypress 0020A3 1 10 EB bpl DumpOutput ;keep dumping output if no keypress 0020A5 1 AD 00 C0 lda Keyboard ;send keypress to RPi 0020A8 1 ;jsr PrintChar 0020A8 1 29 7F and #$7f 0020AA 1 20 C9 20 jsr SendByte 0020AD 1 2C 10 C0 bit ClearKeyboard 0020B0 1 18 clc 0020B1 1 90 DD bcc DumpOutput 0020B3 1 endOutput: 0020B3 1 60 rts 0020B4 1 escapeSequence: 0020B4 1 20 BA 20 jsr ParseEscape 0020B7 1 18 clc 0020B8 1 90 D6 bcc DumpOutput 0020BA 1 0020BA 1 ParseEscape: 0020BA 1 20 E7 20 jsr GetByte ; expect first byte after ESC to be '[' 0020BD 1 C9 DB cmp #'['|$80 0020BF 1 F0 07 beq endParse 0020C1 1 checkLetter: 0020C1 1 20 E7 20 jsr GetByte ; loop until there is a letter 0020C4 1 C9 C1 cmp #$C1 0020C6 1 90 F9 bcc checkLetter 0020C8 1 endParse: 0020C8 1 60 rts 0020C9 1 0020C9 1 SendByte: 0020C9 1 48 pha 0020CA 1 waitWrite: 0020CA 1 AD FB C0 lda InputFlags 0020CD 1 2A rol 0020CE 1 2A rol 0020CF 1 B0 F9 bcs waitWrite 0020D1 1 68 pla 0020D2 1 8D FD C0 sta OutputByte 0020D5 1 A9 1E lda #$1e ; set bit 0 low to indicate write started 0020D7 1 8D F7 C0 sta OutputFlags 0020DA 1 finishWrite: 0020DA 1 AD FB C0 lda InputFlags 0020DD 1 2A rol 0020DE 1 2A rol 0020DF 1 90 F9 bcc finishWrite 0020E1 1 A9 1F lda #$1f 0020E3 1 8D F7 C0 sta OutputFlags 0020E6 1 60 rts 0020E7 1 0020E7 1 GetByte: 0020E7 1 A9 1D lda #$1d ;set read flag low 0020E9 1 8D F7 C0 sta OutputFlags 0020EC 1 waitRead: 0020EC 1 AD FB C0 lda InputFlags 0020EF 1 2A rol 0020F0 1 90 0C bcc readByte 0020F2 1 2C 00 C0 bit Keyboard ;keypress will abort waiting to read 0020F5 1 10 F5 bpl waitRead 0020F7 1 A9 1F lda #$1f ;set all flags high and exit 0020F9 1 8D F7 C0 sta OutputFlags 0020FC 1 38 sec ;failure 0020FD 1 60 rts 0020FE 1 readByte: 0020FE 1 AD FE C0 lda InputByte 002101 1 48 pha 002102 1 A9 1F lda #$1f ;set all flags high 002104 1 8D F7 C0 sta OutputFlags 002107 1 finishRead: 002107 1 AD FB C0 lda InputFlags 00210A 1 2A rol 00210B 1 90 FA bcc finishRead 00210D 1 68 pla 00210E 1 18 clc ;success 00210F 1 end: 00210F 1 60 rts 002110 1 002110 1 HelpCommand: 002110 1 61 32 68 65 .byte "a2help",$00 002114 1 6C 70 00 002117 1 PromptCommand: 002117 1 61 32 70 72 .byte "a2prompt",$00 00211B 1 6F 6D 70 74 00211F 1 00 002120 1 OldPromptChar: 002120 1 5D .byte "]" 002121 1