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document authority for IRQ entry and exit sequence

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Paul Gardner-Stephen committed 2019-04-22 13:56:35 +09:30
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commit 7c31bca28e
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c64/kernal/ea81.s
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@@ -8,6 +8,7 @@
return_from_interrupt: return_from_interrupt:
;; Restore registers and return ;; Restore registers and return
;; Sequence according to Compute's Mapping the 64 p73
pla pla
tay tay
pla pla
c64/kernal/irq_handler.s
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@@ -8,6 +8,7 @@ irq_handler:
;; Also the $0314 vector is widely used (e.g., https://www.lemon64.com/forum/viewtopic.php?t=2112&sid=6ea01982b26da69783120a7923ca46fb) ;; Also the $0314 vector is widely used (e.g., https://www.lemon64.com/forum/viewtopic.php?t=2112&sid=6ea01982b26da69783120a7923ca46fb)
;; Save registers ;; Save registers
;; Sequence according to Compute's Mapping the 64 p73
pha pha
txa txa
pha pha