107 lines
3.2 KiB
ArmAsm
107 lines
3.2 KiB
ArmAsm
* MAINMEM.INIT.S
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* (c) Bobbi 2021 GPLv3
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*
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* Initialization, interrupt handling and reset handling code
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* that resides in main memory.
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* 14-Nov-2021 If started from CSD, gets prefix to CMDBUF.
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* Trampoline in main memory used by aux memory IRQ handler
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* to invoke Apple II / ProDOS IRQs in main memory
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A2IRQ >>> IENTMAIN ; IENTMAIN does not do CLI
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JSR A2IRQ2
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>>> XF2AUX,IRQBRKRET
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A2IRQ2 PHP ; Fake things to look like IRQ
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JMP (A2IRQV) ; Call Apple II ProDOS ISR
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* BRK handler in main memory. Used on Apple IIgs only.
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GSBRK >>> XF2AUX,GSBRKAUX
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** Set prefix if not already set
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*SETPRFX LDA #GPFXCMD
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* STA :OPC7 ; Initialize cmd byte to $C7
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*:L1 JSR MLI
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*:OPC7 DB $00
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* DW GSPFXPL
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* LDX DRVBUF1 ; was $0300
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* BNE RTSINST
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* LDA DEVNUM
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* STA ONLNPL+1 ; Device number
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* JSR MLI
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* DB ONLNCMD
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* DW ONLNPL
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* LDA DRVBUF2 ; was $0301
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* AND #$0F
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* TAX
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* INX
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* STX DRVBUF1 ; was $0300
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* LDA #'/'
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* STA DRVBUF2 ; was $0301
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* DEC :OPC7
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* BNE :L1
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*RTSINST LDA CMDPATH
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* BEQ :GETPFX ; CMDPATH empty
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* LDA CMDPATH+1
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* CMP #'/'
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* BEQ :GETPFXDONE ; CMDPATH already absolute path
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*:GETPFX JSR MLI
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* DB $C7 ; Get Prefix
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* DW :GETADDR
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*:GETPFXDONE RTS
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*:GETADDR HEX 01 ; One parameter
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* DW CMDPATH ; Get prefix to CMDPATH
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*
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*
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** Disconnect /RAM ramdrive to avoid aux corruption
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** Stolen from Beagle Bros Extra K
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*DISCONN LDA MACHID
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* AND #$30
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* CMP #$30
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* BNE :S1
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* LDA DEVADR32
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* CMP DEVADR01
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* BNE :S2
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* LDA DEVADR32+1
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* CMP DEVADR01+1
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* BEQ :S1
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*:S2 LDY DEVCNT
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*:L1 LDA DEVLST,Y
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* AND #$F3
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* CMP #$B3
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* BEQ :S3
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* DEY
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* BPL :L1
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* BMI :S1
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*:S3 LDA DEVLST,Y
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* STA DRVBUF2+1 ; was $0302
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*:L2 LDA DEVLST+1,Y
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* STA DEVLST,Y
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* BEQ :S4
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* INY
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* BNE :L2
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*:S4 LDA DEVADR32
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* STA DRVBUF1 ; was $0300
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* LDA DEVADR32+1
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* STA DRVBUF2 ; was $0301
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* LDA DEVADR01
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* STA DEVADR32
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* LDA DEVADR01+1
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* STA DEVADR32+1
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* DEC DEVCNT
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*:S1 RTS
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*
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* Reset handler - invoked on Ctrl-Reset
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* XFER to AUXMOS ($D000) in aux, AuxZP on, LC on
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RESET TSX
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STX $0100
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LDA AN0OFF ; AN0 off
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LDA AN1OFF ; AN1 off
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LDA AN2ON ; AN2 on
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LDA AN3ON ; AN3 on
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>>> XF2AUX,AUXMOS
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RTS
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