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cc65/libsrc/c16/kbhit.s
uz bfbf94404b Squeezed bytes and cycles out of the kbhit functions for almost all platforms.
git-svn-id: svn://svn.cc65.org/cc65/trunk@4480 b7a2c559-68d2-44c3-8de9-860c34a00d81
2009-11-24 18:31:16 +00:00

27 lines
368 B
ArmAsm

;
; Ullrich von Bassewitz, 06.08.1998
;
; unsigned char kbhit (void);
;
.export _kbhit
.include "plus4.inc"
.proc _kbhit
ldx #0 ; High byte of return is always zero
lda KEY_COUNT ; Get number of characters
ora FKEY_COUNT ; Or with number of chars from function keys
beq L9
lda #1
L9: rts
.endproc