mirror of
https://github.com/dschmenk/apple2pi.git
synced 2024-11-24 12:31:30 +00:00
148 lines
2.0 KiB
ArmAsm
148 lines
2.0 KiB
ArmAsm
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;****************************************
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;*
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;* SLOT INDEPENDENT ROM CODE @ $Cn00
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;*
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;****************************************
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CXSLOT EQU *
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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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;* AUTOSTART/PR# ENTRYPOINT
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;*
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.IFDEF DEBUG
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LDA #'*'
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STA INDCTR+7
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.ENDIF
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PHP
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SEI
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STA XROMOFF
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.IFDEF PIROM
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LDA #$01
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STA BANKSEL
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.ENDIF
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JSR GETSLOT
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LDA #$00
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STA SYNCED,Y ; CLEAR SYNCED FLAG
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JSR SYNC
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BNE NOBOOT
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;*
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;* CREATE COMMAND BUFFER FOR BOOT BLOCK
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;*
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STX PDUNIT ; SLOT * 16, DEV 0
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LDX #$00
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STX PDBLKL
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STX PDBLKH
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STX PDBUFL
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INX ; LDX #PDREAD
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STX PDCMD
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LDX #$08
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STX PDBUFH
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.IFDEF ALTBOOT
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STA STROBE
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JSR PUTMSG
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LDX #$10
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BOOTMSG:
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LDA #$FF
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JSR WAIT
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LDA KEYBD
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BPL BOOTDELAY
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STA STROBE
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LDX #$01
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CMP #'M'+$80
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BEQ :+
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CMP #'m'+$80
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BNE BOOTDELAY
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: LDA #SIBOOT ; LOAD SI BOOT PROGRAM
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STA PDCMD
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BOOTDELAY:
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DEX
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BNE BOOTMSG
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JSR CLRMSG
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LDA IOSLOT
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AND #$0F
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TAY
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.ENDIF
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BOOT: LDX SLOT16
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JSR DOCMD ; READ BOOT BLOCK
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PLP
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PHA
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LDA IOSLOT
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AND #$0F
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TAY
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LDA SAVE16,Y ; SAVED ORIGINAL SLOT16 VALUE
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STA SLOT16
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PLA
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BNE NOBOOT
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JMP $801 ; JUMP TO BOOT BLOCK
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NOBOOT: LDA $00
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BEQ AUTOSTART
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RTS
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AUTOSTART:
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JMP $FABA ; JUMP BACK TO AUTOSTART BOOT SCANNER ROM
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;*
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;* PRODOS INTELLIGENT DEVICE ENTRYPOINT
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;*
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CMDENTRY:
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PHP
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SEI
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STA XROMOFF
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.IFDEF PIROM
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LDA #$01
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STA BANKSEL
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.ENDIF
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JSR GETSLOT
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.IFDEF DEBUG
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LDA PDCMD
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ORA #'0'
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STA INDCTR+1
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.ENDIF
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JSR DOCMD
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PLP
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PHA ; RESTORE ORIGINAL SLOT16 VALUE
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TYA
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PHA
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LDA IOSLOT
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AND #$0F
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TAY
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LDA SAVE16,Y ; SAVED ORIGINAL SLOT16 VALUE
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STA SLOT16
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PLA
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TAY
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PLA
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;*
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;* CHECK FOR ERROR
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;*
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BNE CMDERR
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CLC ; ALL GOOD, CLEAR ERROR FLAG
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RTS
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CMDERR:
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.IFDEF DEBUG
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PHA
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STA $2FF
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LDA #'E'-$40
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STA INDCTR+2
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: LDA KEYBD
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BPL :-
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STA STROBE
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CMP #'M'+$80
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BNE :+
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LDA ROMEN
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JMP MONITOR
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: PLA
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.ENDIF
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SEC ; SET ERROR FLAG
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RTS
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ENDCMD:
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.REPEAT CXSLOT+250-*
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DB $00
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.ENDREP
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DB SIG ; SIGNATURE
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DW 0 ; USE STATUS TO GET SIZE
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DB $97 ; REMOVEABLE, 2 DEVICES, R/W
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DB <CMDENTRY
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