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cc65/libsrc/atmos/kbhit.s
cuz 9f547a5a4d Add basic support for ORIC Atmos
git-svn-id: svn://svn.cc65.org/cc65/trunk@2046 b7a2c559-68d2-44c3-8de9-860c34a00d81
2003-04-13 22:12:09 +00:00

19 lines
392 B
ArmAsm

;
; Ullrich von Bassewitz, 2003-04-13
;
; int kbhit (void);
;
.export _kbhit
.include "atmos.inc"
_kbhit:
ldx #$00 ; Load high byte
lda KEYBUF ; Flag for new char in bit 7
asl a ; Shift bit 7 into carry
txa ; A = 0
rol a ; Move old bit 7 into bit 0
rts