ca65 V2.18 - N/A Main file : MenuFirmware.asm Current file: MenuFirmware.asm 000000r 1 ; Copyright Terence J. Boldt (c)2020-2022 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 firmware 000000r 1 ; that displays the copyright message on boot 000000r 1 ; and checks for the RPi status to be ready before 000000r 1 ; attempting to boot 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 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 000000r 1 Wait = $fca8 000000r 1 PrintChar = $fded 000000r 1 Home = $fc58 000000r 1 ReadChar = $fd0c 000000r 1 BasCalc = $fbc1 000000r 1 htab = $24 000000r 1 vtab = $25 000000r 1 BasL = $28 000000r 1 htab80 = $057b 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 1 of EPROMi 00C70E 1 PageJump: 00C70E 1 8D F7 C0 sta OutputFlags 00C711 1 4C 19 C7 jmp Start 00C714 1 00C714 1 ;entry points for ProDOS 00C714 1 DriverEntry: 00C714 1 A9 0F lda #$0f ;set all flags high and page 0 of EPROM 00C716 1 8D F7 C0 sta OutputFlags 00C719 1 ;since the firmware page changes to 0, this falls through to the driver 00C719 1 00C719 1 Start: 00C719 1 A9 F0 lda #$f0 ;restore COUT after PR# called 00C71B 1 85 36 sta $36 00C71D 1 A9 FD lda #$fd 00C71F 1 85 37 sta $37 00C721 1 ;jsr Home ;clear screen and show menu options 00C721 1 A9 10 lda #$10 00C723 1 85 25 sta vtab 00C725 1 20 C1 FB jsr BasCalc 00C728 1 A0 00 ldy #$00 00C72A 1 PrintString: 00C72A 1 B9 BC C7 lda Text,y 00C72D 1 F0 08 beq WaitForRPi 00C72F 1 09 80 ora #$80 00C731 1 20 ED FD jsr PrintChar 00C734 1 C8 iny 00C735 1 D0 F3 bne PrintString 00C737 1 00C737 1 WaitForRPi: 00C737 1 AD FB C0 lda InputFlags 00C73A 1 2A rol 00C73B 1 B0 0D bcs Reset 00C73D 1 A9 FF lda #$ff 00C73F 1 20 A8 FC jsr Wait 00C742 1 A9 AE lda #'.'+$80 00C744 1 20 ED FD jsr PrintChar 00C747 1 4C 37 C7 jmp WaitForRPi 00C74A 1 00C74A 1 Reset: 00C74A 1 A9 DF lda #'_'|$80 00C74C 1 20 ED FD jsr PrintChar 00C74F 1 A9 00 lda #ResetCommand 00C751 1 20 7A C7 jsr SendByte 00C754 1 A9 88 lda #$88 00C756 1 20 ED FD jsr PrintChar 00C759 1 A9 AE lda #'.'|$80 00C75B 1 20 ED FD jsr PrintChar 00C75E 1 20 98 C7 jsr GetByte 00C761 1 F0 03 beq Ok 00C763 1 4C 4A C7 jmp Reset 00C766 1 00C766 1 Ok: 00C766 1 A9 8D lda #$8D 00C768 1 20 ED FD jsr PrintChar 00C76B 1 A9 CF lda #'O'|$80 00C76D 1 20 ED FD jsr PrintChar 00C770 1 A9 CB lda #'K'|$80 00C772 1 20 ED FD jsr PrintChar 00C775 1 00C775 1 Boot: 00C775 1 A9 0F lda #$0f 00C777 1 4C 0E C7 jmp PageJump 00C77A 1 00C77A 1 SendByte: 00C77A 1 48 pha 00C77B 1 waitWrite: 00C77B 1 AD FB C0 lda InputFlags 00C77E 1 2A rol 00C77F 1 2A rol 00C780 1 B0 F9 bcs waitWrite 00C782 1 68 pla 00C783 1 8D FD C0 sta OutputByte 00C786 1 A9 3E lda #$3e ; set bit 0 low to indicate write started 00C788 1 8D F7 C0 sta OutputFlags 00C78B 1 finishWrite: 00C78B 1 AD FB C0 lda InputFlags 00C78E 1 2A rol 00C78F 1 2A rol 00C790 1 90 F9 bcc finishWrite 00C792 1 A9 3F lda #$3f 00C794 1 8D F7 C0 sta OutputFlags 00C797 1 60 rts 00C798 1 00C798 1 GetByte: 00C798 1 A9 3D lda #$3d ;set read flag low 00C79A 1 8D F7 C0 sta OutputFlags 00C79D 1 waitRead: 00C79D 1 AD FB C0 lda InputFlags 00C7A0 1 2A rol 00C7A1 1 B0 FA bcs waitRead 00C7A3 1 AD FE C0 lda InputByte 00C7A6 1 48 pha 00C7A7 1 A9 3F lda #$3f ;set all flags high 00C7A9 1 8D F7 C0 sta OutputFlags 00C7AC 1 finishRead: 00C7AC 1 AD FB C0 lda InputFlags 00C7AF 1 2A rol 00C7B0 1 90 FA bcc finishRead 00C7B2 1 68 pla 00C7B3 1 end: 00C7B3 1 60 rts 00C7B4 1 00C7B4 1 00 00 00 00 .repeat 187-