mirror of
https://github.com/RevCurtisP/C02.git
synced 2024-06-30 01:29:41 +00:00
23 lines
600 B
Plaintext
23 lines
600 B
Plaintext
;Screen Control Assembly Lanuage Routines for VIC-20
|
|
|
|
;Clear the Screen
|
|
CLRSCR EQU $E544 ;Aliased to CLSR Routine
|
|
|
|
;Move Cursor To Home Position
|
|
CRSRHM EQU $E566 ;Aliased to HOME Routine
|
|
|
|
;Move Cursor to Specified Coordinates
|
|
SETPOS: STA $D3 ;Save Cursor Column
|
|
STY $D6 ;Save Cursor Row
|
|
JMP $E56C ;Set Screen Poiners and Return
|
|
|
|
;Get Cursor Position
|
|
GETPOS: LDY $D6 ;Load Cursor Row
|
|
LDA $D3 ;Load Cursor Column
|
|
RTS
|
|
|
|
;Get Screen Size
|
|
GETSIZ: JSR $FFED ;Call SCREEN Kernal Routine
|
|
TXA ;Transfer Width to Accumulator
|
|
RTS
|