Add irq handling, PAL/NTSC detection and clock()

2022-03-22 20:02:46 +02:00
parent 0851474757
commit 220171d0da
2 changed files with 125 additions and 0 deletions
--- a/libsrc/atari7800/irq.s
+++ b/libsrc/atari7800/irq.s
@@ -0,0 +1,36 @@
+;
+; IRQ handling (Atari 7800 version)
+;
+
+        .export         initirq, doneirq, IRQStub
+
+        .import         __INTERRUPTOR_COUNT__, callirq
+
+        .include        "atari7800.inc"
+
+	.code
+; ------------------------------------------------------------------------
+
+initirq:
+doneirq:
+        rts
+
+; ------------------------------------------------------------------------
+
+IRQStub:
+        cld                             ; Just to be sure
+        pha
+        lda     #<(__INTERRUPTOR_COUNT__ * 2)
+        beq     @L1
+        txa
+        pha
+        tya
+        pha
+        jsr     callirq                 ; Call the functions
+	pla
+        tay
+        pla
+        tax
+@L1:	pla
+        rti
+