48 lines
1.2 KiB
NASM
48 lines
1.2 KiB
NASM
; Copyright (C) 2019 Christophe Meneboeuf <christophe@xtof.info>
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;
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; This program is free software: you can redistribute it and/or modify
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; it under the terms of the GNU General Public License as published by
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; the Free Software Foundation, either version 3 of the License, or
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; (at your option) any later version.
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;
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; This program is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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; GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public License
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; along with this program. If not, see <http://www.gnu.org/licenses/>.
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.export Clear_Gr1
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.CODE
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;@brief Clears GR1 screen
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; BEWARE : It will fill the "holes" with 0s
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Clear_Gr1:
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lda #0 ; black
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ldx #0
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clear_gr1_1:
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sta $400, X
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inx
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bne clear_gr1_1
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ldx #0
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clear_gr1_2:
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sta $500, X
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inx
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bne clear_gr1_2
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ldx #0
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clear_gr1_3:
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sta $600, X
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inx
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bne clear_gr1_3
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ldx #0
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clear_gr1_4:
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sta $700, X
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inx
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bne clear_gr1_4
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rts |