NEW
PREFIX /A2OSX.BUILD
AUTO 4,1
*--------------------------------------
* called directly by IRQ Vector $FFFE in AuxLC
* Must keep:
*  A,X,Y
*   SETREADAUX
*  if we are here, Aux ZP/Stack already On
* Exit with RTI
* if A2osX Drivers cannot clear IRQ, 
* must call regular System Handler
*--------------------------------------
MSLOT			.EQ $7f8
*--------------------------------------
K.IrqHAuxLC		sta .6+1
				pla
				pha
				and #$10				BRK?
				bne .7
				
				stx	.5+1
				sty .4+1
				
				lda $fe					Save 2 bytes in ZP
				pha
				lda $ff
				pha
				
				lda MSLOT				Save MSLOT
				pha
				
				lda RDREADAUX
				pha
				sta CLRREADAUX			Make sure we can access Dev.Table
				
				lda RDWRITEAUX
				pha
				sta CLRWRITEAUX			Driver may R/W in screen holes
				
				jsr K.IrqH
					
				pla						Must keep Carry
				bpl .10
				sta SETWRITEAUX
				
.10				pla
				bpl .1
				sta SETREADAUX
				
.1				pla						Get back MSLOT
				sta MSLOT
				sta .2+2

				and #$C0
				eor #$C0				....mmm...not looking link Cn....
				bne .3
				sta	$CFFF				Release $C800			
				
.2				lda $ff00				SELF MODIFIED				
				
.3				pla
				sta $ff
				pla
				sta $fe
				
.4				ldy #$ff				Self Modified
.5				ldx #$ff				Self Modified
.6				lda #$ff				Self Modified
				bcs .8
				rti
				
.7				lda .6+1
				
.8				jmp (IRQ.OldFFFE)
*--------------------------------------
* Called by :
*  - Kernel K.IrqHAuxLC
*  - ProDOS IRQ Manager (GP)
*--------------------------------------
K.IrqH			jmp K.IrqH.DEV			Modified by INIT
*--------------------------------------
K.IrqH.TCLOCK	ldy IRQ.VBL.n0
				
				lda $c080,y
				and #$20
				beq K.IrqH.DEV
				
				lda $c080,y
				lda $c088,y
				
				inc CORE.IRQTick
				
				clc
				rts
*--------------------------------------
K.IrqH.VBL		jsr IRQ.VBL.MSM			SERVEMOUSE
				bcs K.IrqH.DEV			Not From Mouse
				
				ldx IRQ.VBL.0n
				lda $778,x
				and #$08				IRQ was caused by VBL ?
				beq K.IrqH.DEV
				
				ldx IRQ.VBL.MRM+2		$Cn
				ldy IRQ.VBL.n0
				jsr IRQ.VBL.MRM			READMOUSE

				inc CORE.IRQTick
				
				clc
				rts
*--------------------------------------			
K.IrqH.DEV		>LDYAI Dev.Table
				>STYA $fe

				ldx DevMgr.Count
				
.4				ldy #S.DEV.S
				lda ($fe),y
				and #S.DEV.S.IRQ
				beq .6
				
				phx
				jsr K.IrqHJMP
				plx
				bcc .8					CC, IRQ cleared by device
				
.6				lda $fe
				clc
				adc #S.DEV
				sta $fe
				bcc .7
				inc $ff
				
.7				dex
				bne .4
				
				sec
				
.8				rts
*--------------------------------------
IRQ.IntNum		.BS 1
*--------------------------------------
IRQ.OldFFFE		.BS 2
*--------------------------------------
IRQ.VBL.n0		.BS 1
IRQ.VBL.0n		.BS 1
IRQ.VBL.MSM		jmp $0000
IRQ.VBL.MRM		jmp $0000
*--------------------------------------
K.IrqHJMP		ldx #DEVMGR.IRQ
				jmp ($fe)
*--------------------------------------
MAN
SAVE /A2OSX.SRC/SYS/KERNEL.S.IRQ
LOAD /A2OSX.SRC/SYS/KERNEL.S
ASM