mirror of
https://github.com/A2osX/A2osX.git
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89 lines
1.9 KiB
Plaintext
89 lines
1.9 KiB
Plaintext
NEW
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AUTO 3,1
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*--------------------------------------
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* this routine handles interrupts and is coded to reach 'lreset' precisely at
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* address $FFCB (ROM rts opcode) for rom switching to function.
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* $2D9B-2DFF moved to $FF9B-FFFF
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*--------------------------------------
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OLDROM.IRQV
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* pha
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* lda accsav
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* sta oldacc
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* pla
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* sta accsav
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* pla get status register from stack
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* pha and put it back.
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* and #$10 is it a break or interrupt?
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* bne H2DC2 branch if break.
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* lda $D000 get ram bankid (LC1 = $D8, LC2=$EE)
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* eor #$D8 is the system active? ($D8)
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* beq sysactv branch if it is
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* lda #$FF
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*sysactv sta bankid
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* sta afbank
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* lda /aftirq setup return address
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* pha
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* lda #aftirq
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* pha
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* lda #$04 status reg with interrupt flag set
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* pha
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*H2DC2 lda /romirq setup ROM re-entry
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* pha
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* lda #romirq
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* pha
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.LIST ON
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IRQ.FREE1 .EQ $ffc8-*
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.LIST OFF
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.BS IRQ.FREE1
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gorom sta RROMBNK2 hits ROM rts at $FFCB
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* 'lreset' address must = $FFCB for rom switch i/o to work
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lreset lda /resetv-1
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pha
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lda #resetv-1
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pha
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jmp gorom
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*rreset .DA resetv-1 rts to resetv
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*fix45 sta p8areg A register savearea
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* lda oldacc
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* sta accsav
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* lda RRAMWRAMBNK1 read/write RAM bank 1
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* lda RRAMWRAMBNK1
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* lda afbank
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* jmp irqxit0
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stypfx sty newpfxptr fix appletalk PFI bug
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sty preflag prefix flag
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rts
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stapfx sta newpfxptr
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sta preflag
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rts
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.LIST ON
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IRQ.FREE2 .EQ $fffa-*
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.LIST OFF
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.BS IRQ.FREE2
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.DA nmivect nmi handler
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.DA lreset reset handler
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irqv .DA * PATCHED with ROM vector by LDR
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.LIST OFF
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*--------------------------------------
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MAN
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SAVE USR/SRC/PRODOS.FX/PRODOS.S.IRQ
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LOAD USR/SRC/PRODOS.FX/PRODOS.S
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ASM
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