52 lines
1.6 KiB
ArmAsm
52 lines
1.6 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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AUDIOCARD DB $00 ; $00 = Mockingboard, $01 = Ensoniq
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* Trampoline in main memory used by aux memory IRQ handler
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* to invoke Apple II / ProDOS IRQs in main memory
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A2IRQ >>> IENTMAIN ; IENTMAIN does not do CLI
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LDA #>A2IRQRET
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PHA
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LDA #<A2IRQRET
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PHA
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PHP ; Fake things to look like IRQ
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JMP (A2IRQV) ; Call Apple II ProDOS ISR
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A2IRQRET >>> XF2AUX,IRQBRKRET
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* BRK handler in main memory. Used on Apple IIgs only.
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GSBRK >>> XF2AUX,GSBRKAUX
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* Reset handler - invoked on Ctrl-Reset
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* XFER to AUXMOS ($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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JSR RESETHW ; Reset hardware
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>>> XF2AUX,AUXMOS
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* Reset hardware
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RESETHW SEC
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STZ AUDIOCARD
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JSR IDROUTINE ; See if this is a GS
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BCS :NOTGS
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JSR ENSQINIT ; Initialize Ensoniq
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INC AUDIOCARD
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RTS ; AUDIOCARD=1
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:NOTGS
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JSR MOCKINIT ; Initialize Mockingboard (sl4)
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RTSINSTR RTS ; AUDIOCARD=0
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