2014-02-15 05:06:12 +00:00
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.DEFINE EQU =
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.DEFINE DB .BYTE
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.DEFINE DW .WORD
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.DEFINE PAGE .ALIGN 256
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.DEFINE ORG .ORG
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2014-02-10 00:37:46 +00:00
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.CODE
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2014-02-15 05:06:12 +00:00
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ROMSLOT EQU $07
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PISLOT EQU $02 ; ROMSLOT
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BOOTDEV EQU ROMSLOT*16
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ORG $C000+ROMSLOT*256
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2014-02-10 00:37:46 +00:00
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;*
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;* ACIA REGISTERS
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;*
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ACIADR EQU $C088+PISLOT*16
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ACIASR EQU $C089+PISLOT*16
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ACIACR EQU $C08A+PISLOT*16
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ACIAMR EQU $C08B+PISLOT*16
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;*
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;* APPLE I/O LOCATIONS
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;*
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2014-02-15 05:06:12 +00:00
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INDCTR EQU $0400
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2014-02-10 00:37:46 +00:00
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KEYBD EQU $C000
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STROBE EQU $C010
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;*
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2014-02-15 05:06:12 +00:00
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;* DRIVER SCRATCHPAD
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;*
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PAD0 EQU $0478+ROMSLOT
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PAD1 EQU $04F8+ROMSLOT
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PAD2 EQU $0578+ROMSLOT
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PAD3 EQU $05F8+ROMSLOT
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PAD4 EQU $0678+ROMSLOT
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PAD5 EQU $06F8+ROMSLOT
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PAD6 EQU $0778+ROMSLOT
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PAD7 EQU $07F8+ROMSLOT
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;*
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2014-02-10 00:37:46 +00:00
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;* UTIL ROUTINES
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;*
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WAIT EQU $FCA8
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COUT EQU $FDED
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CROUT EQU $FD8E
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PRBYTE EQU $FDDA
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PRHEX EQU $FDE3
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PRNTAX EQU $F941
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RDKEY EQU $FD0C
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RDCHAR EQU $FD35
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GETLN EQU $FD6A
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;*
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;* ZERO PAGE PARAMETERS
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;*
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PDCMD EQU $42
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PDUNIT EQU $43
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PDBUFF EQU $44
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PDBUFL EQU $44
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PDBUFH EQU $45
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PDBLKL EQU $46
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PDBLKH EQU $47
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;*
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;* PRODOS COMMANDS
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;*
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PDSTAT EQU 0
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PDREAD EQU 1
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PDWRITE EQU 2
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PDFORMT EQU 3
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;*
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;* PRODOS ERRORS
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;*
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PDNOERR EQU $00
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PDIOERR EQU $27
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PDNODEV EQU $28
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PDWRPRT EQU $2B
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;*
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;* AUTOSTART BOOT SIGNATURE
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;*
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LDX #$20
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LDY #$00
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LDX #$03
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STX $3C
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;*
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;* INIT ACIA
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;*
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2014-02-16 03:53:09 +00:00
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STY PAD1 ; CLEAR SYNCED FLAG
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2014-02-10 00:37:46 +00:00
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STY ACIASR ; RESET STATUS REGISTER
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2014-02-16 03:53:09 +00:00
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LDA #$0B
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STA ACIACR ; SET CONTROL REGISTER
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LDA #$10
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STA ACIAMR ; SET COMMAND REGISTER (115K BAUD)
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;*
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;* CREATE COMMAND BUFFER FOR BOOT BLOCK
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;*
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STY PDUNIT
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STY PDBUFL
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STY PDBLKL
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STY PDBLKH
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INY ; LDY #PDREAD
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STY PDCMD
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LDY #$08
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STY PDBUFH
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JSR DOCMD
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BCC BOOT
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LDA $00
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BEQ CONT
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RTS
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CONT: JMP $FABA ; JUMP BACK TO AUTOSTART BOOT SCANNER ROM
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BOOT: LDX #BOOTDEV
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STX PDUNIT
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JMP $801
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;*
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;* PRODOS INTELLIGENT DEVICE ENTRYPOINT
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;*
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DOCMD: PHP
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SEI
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LDA PAD1
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CMP #$81
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BEQ SNDCMD
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2014-02-10 00:37:46 +00:00
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;*
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;* SYNC WITH HOST
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;*
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SYNC: LDA #$80
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STA ACIADR
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2014-02-16 03:53:09 +00:00
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LDA INDCTR
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PHA
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2014-02-15 05:06:12 +00:00
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INX
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TXA
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AND #$07
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TAX
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LDA SPIN,X
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STA INDCTR
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2014-02-10 00:37:46 +00:00
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LDA #$FF
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JSR WAIT
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2014-02-16 03:53:09 +00:00
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PLA
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2014-02-15 05:06:12 +00:00
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STA INDCTR
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2014-02-10 00:37:46 +00:00
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LDA KEYBD
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2014-02-16 03:53:09 +00:00
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BPL CHKRSP
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STA STROBE
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BMI IOERR
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SPIN: DB $A1, $AF, $AD, $DC, $A1, $AF, $AD, $DC
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CHKRSP: LDA ACIASR
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2014-02-10 00:37:46 +00:00
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AND #$08
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BEQ SYNC
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2014-02-16 03:53:09 +00:00
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LDA ACIADR
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CMP #$81
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2014-02-10 00:37:46 +00:00
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BNE SYNC
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2014-02-16 03:53:09 +00:00
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STA PAD1
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SNDCMD: LDA PDUNIT
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2014-02-10 00:37:46 +00:00
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ASL
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LDA PDCMD
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ROL
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ASL
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2014-02-15 05:06:12 +00:00
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ORA #$A0
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STA PAD0
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2014-02-10 00:37:46 +00:00
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JSR SENDACC
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LDA PDBLKL
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JSR SENDACC
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LDA PDBLKH
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JSR SENDACC
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CHKACK: JSR RECVACC
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TAX
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DEX
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2014-02-15 05:06:12 +00:00
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CPX PAD0
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2014-02-10 00:37:46 +00:00
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BNE CHKACK
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2014-02-15 05:06:12 +00:00
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LDY PDCMD
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BEQ STATUS
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LDX #$02 ; # OF PAGES TO XFER
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DEY ; CPY #PDREAD
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2014-02-10 00:37:46 +00:00
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BEQ RDBLK
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2014-02-15 05:06:12 +00:00
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DEY ; CMP #PDWRITE
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2014-02-10 00:37:46 +00:00
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BEQ WRBLK
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2014-02-15 05:06:12 +00:00
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IOERR: LDA #PDIOERR
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2014-02-10 00:37:46 +00:00
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CMDERR: PLP
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SEC
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RTS
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2014-02-15 05:06:12 +00:00
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RDBLK: JSR RECVACC
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STA (PDBUFF),Y
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INY
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BNE RDBLK
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INC PDBUFH
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DEX
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BNE RDBLK
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STATUS: LDX #$FF
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DEY ; LDY #$FF
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2014-02-10 00:37:46 +00:00
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CMDEX: JSR RECVACC
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BNE CMDERR
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PLP
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CLC
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RTS
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2014-02-15 05:06:12 +00:00
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WRBLK: LDA (PDBUFF),Y
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2014-02-10 00:37:46 +00:00
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JSR SENDACC
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INY
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2014-02-15 05:06:12 +00:00
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BNE WRBLK
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2014-02-10 00:37:46 +00:00
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INC PDBUFH
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2014-02-15 05:06:12 +00:00
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DEX
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BNE WRBLK
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2014-02-10 00:37:46 +00:00
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BEQ CMDEX
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2014-02-15 05:06:12 +00:00
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;*
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;* ACIA I/O ROUTINES
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;*
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2014-02-10 00:37:46 +00:00
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SENDACC:
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PHA
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SENDWT: LDA ACIASR
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AND #$10
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BEQ SENDWT
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PLA
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STA ACIADR
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RTS
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RECVACC:
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RECVWT: LDA ACIASR
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AND #$08
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BEQ RECVWT
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LDA ACIADR
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2014-02-15 05:06:12 +00:00
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RTS
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2014-02-16 03:53:09 +00:00
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ENDCMD:
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2014-02-15 05:06:12 +00:00
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.REPEAT $C000+ROMSLOT*256+250-*
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DB $FF
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.ENDREP
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DB "Pi"
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DW 0
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2014-02-16 03:53:09 +00:00
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DB $97
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2014-02-15 05:06:12 +00:00
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DB <DOCMD
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2014-02-16 03:53:09 +00:00
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.ASSERT * = $C000+(ROMSLOT+1)*256, error, "Code not page size"
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