ca65 V2.18 - Raspbian 2.19-1 Main file : FileAccessFirmware.asm Current file: FileAccessFirmware.asm 000000r 1 ; Copyright Terence J. Boldt (c)2020-2023 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 firmware 000000r 1 ; that was formerly used to copy files from RPi 000000r 1 ; to Apple II RAM 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+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 = $fd67 000000r 1 Monitor = $ff59 000000r 1 000000r 1 .org SLOT*$100 + $C000 00C700 1 ;ID bytes for booting and drive detection 00C700 1 E0 20 cpx #$20 ;ID bytes for ProDOS and the 00C702 1 E0 00 cpx #$00 ; Apple Autostart ROM 00C704 1 E0 03 cpx #$03 ; 00C706 1 00C706 1 A2 70 ldx #SLOT*$10 00C708 1 86 2B stx $2b 00C70A 1 86 43 stx Unit 00C70C 1 00C70C 1 ;force EPROM to second page on boot 00C70C 1 A9 3F lda #$3f ;set all flags high and page 3 of EPROM for menu 00C70E 1 PageJump: 00C70E 1 8D F7 C0 sta OutputFlags 00C711 1 4C 19 C7 jmp Start ;this jump is only called if coming in from PageJump with A=$2f 00C714 1 00C714 1 ;entry points for ProDOS 00C714 1 DriverEntry: 00C714 1 A9 0F lda #$0f ;set all flags high and page 0 of EPROM 00C716 1 8D F7 C0 sta OutputFlags 00C719 1 00C719 1 Start: 00C719 1 A9 A4 lda #$a4 00C71B 1 85 33 sta $33 00C71D 1 00C71D 1 GetFilename: 00C71D 1 20 67 FD jsr InputString 00C720 1 00C720 1 LoadFile: 00C720 1 A9 00 lda #$00 00C722 1 85 44 sta BufferLo 00C724 1 A9 20 lda #$20 00C726 1 85 45 sta BufferHi 00C728 1 A9 06 lda #$06 ; send command 6 = load 00C72A 1 20 74 C7 jsr SendByte 00C72D 1 A0 00 ldy #$00 00C72F 1 sendFilename: 00C72F 1 B9 00 02 lda $0200,y 00C732 1 C9 8D cmp #$8d 00C734 1 F0 08 beq sendNullTerminator 00C736 1 29 7F and #$7f 00C738 1 20 74 C7 jsr SendByte 00C73B 1 C8 iny 00C73C 1 D0 F1 bne sendFilename 00C73E 1 sendNullTerminator: 00C73E 1 A9 00 lda #$00 00C740 1 20 74 C7 jsr SendByte 00C743 1 00C743 1 20 92 C7 jsr GetByte 00C746 1 85 46 sta BlockLo ; not really a block, just using the memory space 00C748 1 20 92 C7 jsr GetByte 00C74B 1 85 47 sta BlockHi 00C74D 1 NextPage: 00C74D 1 A5 47 lda BlockHi 00C74F 1 F0 10 beq ReadFinalPage 00C751 1 A0 00 ldy #$00 00C753 1 NextByte: 00C753 1 20 92 C7 jsr GetByte 00C756 1 91 44 sta (BufferLo),y 00C758 1 C8 iny 00C759 1 D0 F8 bne NextByte 00C75B 1 E6 45 inc BufferHi 00C75D 1 C6 47 dec BlockHi 00C75F 1 D0 EC bne NextPage 00C761 1 ReadFinalPage: 00C761 1 A5 46 lda BlockLo 00C763 1 F0 0C beq ExitToMonitor 00C765 1 A0 00 ldy #$00 00C767 1 NextByteFinal: 00C767 1 20 92 C7 jsr GetByte 00C76A 1 91 44 sta (BufferLo),y 00C76C 1 C8 iny 00C76D 1 C4 46 cpy BlockLo 00C76F 1 D0 F6 bne NextByteFinal 00C771 1 ExitToMonitor: 00C771 1 20 59 FF jsr Monitor 00C774 1 00C774 1 SendByte: 00C774 1 48 pha 00C775 1 waitWrite: 00C775 1 AD FB C0 lda InputFlags 00C778 1 2A rol 00C779 1 2A rol 00C77A 1 B0 F9 bcs waitWrite 00C77C 1 68 pla 00C77D 1 8D FD C0 sta OutputByte 00C780 1 A9 2E lda #$2e ; set bit 0 low to indicate write started 00C782 1 8D F7 C0 sta OutputFlags 00C785 1 finishWrite: 00C785 1 AD FB C0 lda InputFlags 00C788 1 2A rol 00C789 1 2A rol 00C78A 1 90 F9 bcc finishWrite 00C78C 1 A9 2F lda #$2f 00C78E 1 8D F7 C0 sta OutputFlags 00C791 1 60 rts 00C792 1 00C792 1 GetByte: 00C792 1 A9 2D lda #$2d ;set read flag low 00C794 1 8D F7 C0 sta OutputFlags 00C797 1 waitRead: 00C797 1 AD FB C0 lda InputFlags 00C79A 1 2A rol 00C79B 1 B0 FA bcs waitRead 00C79D 1 AD FE C0 lda InputByte 00C7A0 1 48 pha 00C7A1 1 A9 2F lda #$2f ;set all flags high 00C7A3 1 8D F7 C0 sta OutputFlags 00C7A6 1 finishRead: 00C7A6 1 AD FB C0 lda InputFlags 00C7A9 1 2A rol 00C7AA 1 90 FA bcc finishRead 00C7AC 1 68 pla 00C7AD 1 end: 00C7AD 1 60 rts 00C7AE 1 00C7AE 1 00 00 00 00 .repeat 251-