mirror of
https://github.com/dschmenk/apple2pi.git
synced 2024-11-24 12:31:30 +00:00
173 lines
2.1 KiB
ArmAsm
173 lines
2.1 KiB
ArmAsm
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.DEFINE EQU =
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.CODE
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PISLOT EQU $05
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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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KEYBD EQU $C000
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STROBE EQU $C010
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;*
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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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STY ACIASR ; RESET STATUS REGISTER
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LDY #$0B
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STY ACIACR ; SET CONTROL REGISTER
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LDY #$10
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STY ACIAMR ; SET COMMAND REGISTER (115K BAUD)
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;*
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;* SYNC WITH HOST
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;*
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SYNC: LDA #$80
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STA ACIADR
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LDA #$FF
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JSR WAIT
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LDA KEYBD
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BMI SKIPBOOT
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LDA ACIASR
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AND #$08
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BEQ SYNC
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LDA ACIADR
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CMP #$81
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BNE SYNC
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BEQ BOOT
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SKIPBOOT: STA STROBE
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JMP $FABA ; JUMP BACK TO BOOT SCANNER ROM ROUTINE
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;*
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;* CREATE COMMAND BUFFER FOR BOOT BLOCK
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;*
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BOOT: LDA #PDREAD
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STA PDCMD
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LDA #$00
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STA PDUNIT
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STA PDBUFL
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STA PDBLKL
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STA PDBLKH
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PHA
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LDA #$08
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STA PDBUFH
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PHA
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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 PDUNIT
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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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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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CPX PDCMD
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BNE CHKACK
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LDY #$00
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CPX #PDREAD
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BEQ RDBLK
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CPX #PDWRITE
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BEQ WRBLK
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CPX #PDSTAT
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BEQ STATDEV
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LDA #PDIOERR
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CMDERR: PLP
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SEC
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RTS
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STATDEV:
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LDX #$FF
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LDY #$FF
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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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RDBLK:
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RD1BLK: JSR RECVACC
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STA (PDBUFF),Y
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INY
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BNE RD1BLK
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INC PDBUFH
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RD2BLK: JSR RECVACC
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STA (PDBUFF),Y
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INY
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BNE RD2BLK
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BEQ CMDEX
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WRBLK:
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WR1BLK: LDA (PDBUFF),Y
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JSR SENDACC
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INY
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BNE WR1BLK
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INC PDBUFH
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WR2BLK: LDA (PDBUFF),Y
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JSR SENDACC
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INY
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BNE WR1BLK
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BEQ CMDEX
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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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RTS
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