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cc65/libsrc/atari/cpeekrevers.s
Greg King ae7a38f3de Added peek functions to the conio library.
The functions return the character, or its attributes, that is at the current screen location of conio's cursor.  The values can be used directly by the output functions to reproduce that screen character.
2021-12-11 18:47:33 -05:00

19 lines
394 B
ArmAsm

;
; 2017-06-21, Greg King
;
; unsigned char cpeekrevers (void);
;
.export _cpeekrevers
.include "atari.inc"
_cpeekrevers:
lda OLDCHR ; get char under cursor
and #$80 ; get reverse bit
asl a
tax ; ldx #>$0000
rol a ; return boolean value
rts