chris/open-roms
1
0 Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

adapted to Kick Assembler, some documentation update

Browse Source
This commit is contained in:
FeralChild64 committed 2019-09-07 12:35:21 +02:00
1 parent ae23dbae7b
commit de27124b4f
198 files changed
+4181 -3976
Download Patch File Download Diff File Expand all files Collapse all files

No files matched your search

c64/kernal/f6ed.stop.s
+15 -15
View File
@@ -1,24 +1,24 @@
;;
;; Official Kernal routine, described in:
;;
;; - [RG64] C64 Programmer's Reference Guide - page 301
;; - [CM64] Compute's Mapping the Commodore 64 - page 232
;;
;; CPU registers that has to be preserved (see [RG64]): .Y
;;
//
// Official Kernal routine, described in:
//
// - [RG64] C64 Programmer's Reference Guide - page 301
// - [CM64] Compute's Mapping the Commodore 64 - page 232
//
// CPU registers that has to be preserved (see [RG64]): .Y
//
stop:
;; Bit 7 of STKEY contains the state of the STOP key
;; (Compute's Mapping the 64, p27)
STOP:
// Bit 7 of STKEY contains the state of the STOP key
// (Compute's Mapping the 64, p27)
;; BASIC checks carry flag to indicate STOP or not
// BASIC checks carry flag to indicate STOP or not
lda STKEY
bpl stop_pressed
;; By trial and error, we know that Z + C = BREAK
;; and that neither should be set otherwise
lda #$ff
// By trial and error, we know that Z + C = BREAK
// and that neither should be set otherwise
lda #$FF
clc
rts