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New version from Oliver Schmidt

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git-svn-id: svn://svn.cc65.org/cc65/trunk@3421 b7a2c559-68d2-44c3-8de9-860c34a00d81
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cuz
2005-03-26 17:03:30 +00:00
parent fe2d8f26ed
commit 071c58bda2
27 changed files with 512 additions and 598 deletions
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42
libsrc/apple2/cgetc.s
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@@ -1,25 +1,23 @@
;;
;; Kevin Ruland
;;
;; char cgetc (void);
;;
;; If open_apple key is pressed then the high-bit of the
;; key is set.
.export _cgetc
;
; Kevin Ruland
;
; char cgetc (void);
;
; If open_apple key is pressed then the high-bit of the key is set.
;
.include "apple2.inc"
.export _cgetc
.include "apple2.inc"
_cgetc:
lda KBD
bpl _cgetc ; if < 128, no key pressed
;; At this time, the high bit of the key pressed
;; is set
bit KBDSTRB ; clear keyboard strobe
bit BUTN0 ; check if OpenApple is down
bmi pressed
and #$7F ; If not down, then clear high bit
pressed:
ldx #$00
rts
lda KBD
bpl _cgetc ; if < 128, no key pressed
; At this time, the high bit of the key pressed is set
bit KBDSTRB ; clear keyboard strobe
bit BUTN0 ; check if OpenApple is down
bmi :+
and #$7F ; If not down, then clear high bit
: ldx #$00
rts