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adapted to Kick Assembler, some documentation update

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FeralChild64 committed 2019-09-07 12:35:21 +02:00
1 parent ae23dbae7b
commit de27124b4f
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+4181 -3976
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c64/kernal/interrupts/fe47.default_nmi_handler.s
+12 -13
View File
@@ -1,34 +1,33 @@
default_nmi_handler:
;; Implemented according to Compute's Mapping the Commodore 64, page 74
;; and to https://www.c64-wiki.com/wiki/Interrupt
// Implemented according to Compute's Mapping the Commodore 64, page 74
// and to https://www.c64-wiki.com/wiki/Interrupt
;; Save registers, sequence according to Compute's Mapping the Commodore 64, page 73
// Save registers, sequence according to Compute's Mapping the Commodore 64, page 73
pha
txa
pha
tya
pha
;; XXX: RS-232 support is not implemented
// XXX: RS-232 support is not implemented
;; XXX confirm NMIs from CIA, or no other NMI will arrive!
// XXX confirm NMIs from CIA, or no other NMI will arrive!
jsr cartridge_check
bcc +
bcc !+
jmp (ICART_WARM_START)
*
!:
;; According to C64 Wiki, if STOP key is pressed, the routine assumes warm start request
// According to C64 Wiki, if STOP key is pressed, the routine assumes warm start request
jsr JSTOP
bcs +
jmp return_from_interrupt ; no STOP pressed
*
;; STOP + RESTORE - clean the address of the BRK instruction (it's not BRK) first
bcs !+
jmp return_from_interrupt // no STOP pressed
!:
// STOP + RESTORE - clean the address of the BRK instruction (it's not BRK) first
lda #$00
sta CMP0+0
sta CMP0+1
jmp (CBINV)