mirror of
https://github.com/nippur72/apple1-videocard-lib.git
synced 2024-05-28 18:41:30 +00:00
105 lines
2.2 KiB
C
105 lines
2.2 KiB
C
// SCREEN 1 VALUES
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// sprite patterns: $0000
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// pattern table: $0800 (256*8)
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// sprite attributes: $1000
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// unused: $1080
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// name table: $1400 (32*24)
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// unused: $1800
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// color table: $2000 (32)
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// unused $2020-$3FFF
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#define SCREEN1_PATTERN_TABLE 0x0800
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#define SCREEN1_NAME_TABLE 0x1400
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#define SCREEN1_COLOR_TABLE 0x2000
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#define SCREEN1_SPRITE_PATTERNS 0x0000
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#define SCREEN1_SPRITE_ATTRS 0x1000
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#define SCREEN1_SIZE (32*24)
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byte SCREEN1_TABLE[8] = {
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0x00, 0xc0, 0x05, 0x80, 0x01, 0x20, 0x00, 0x25
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};
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// loads the Laser 500 font on the pattern table
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void SCREEN1_LOAD_FONT() {
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static byte *source = FONT;
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static word i;
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// start writing into VRAM from "space" character
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set_vram_addr(SCREEN1_PATTERN_TABLE+(32*8));
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for(i=0;i<768;i++) {
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POKE(VDP_DATA, *source);
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source++;
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}
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source = FONT;
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set_vram_addr(SCREEN1_PATTERN_TABLE+((128+32)*8));
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for(i=0;i<768;i++) {
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POKE(VDP_DATA, ~(*source));
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source++;
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}
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// TODO: inverted characters ?
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}
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// prints character to TMS (SCREEN 1 MODE)
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void fastcall SCREEN1_PUTCHAR(byte c) {
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set_vram_addr(tms_cursor);
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POKE(VDP_DATA, c);
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tms_cursor++;
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}
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// prints 0 terminated string pointed by YA
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void SCREEN1_PUTS(char *s) {
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byte c;
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while(1) {
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c = *s;
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// c = *s & 127; // TODO: explain why???
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if(c==0) return;
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SCREEN1_PUTCHAR(c);
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s++;
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}
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}
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void SCREEN1_HOME() {
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tms_cursor = SCREEN1_NAME_TABLE;
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}
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void SCREEN1_LOCATEXY(byte x, byte y) {
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tms_cursor = SCREEN1_NAME_TABLE + ((word)y)*32 + x;
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}
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void SCREEN1_INIT() {
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static byte i;
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for(i=0;i<8;i++) {
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write_reg(i, SCREEN1_TABLE[i]);
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}
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}
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void SCREEN1_FILL() {
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static word i;
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// fills name table with spaces (32)
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set_vram_addr(SCREEN1_NAME_TABLE);
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for(i=0;i<SCREEN1_SIZE;i++) {
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POKE(VDP_DATA, 32);
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// nops here?
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}
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// fill pattern table with 0
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set_vram_addr(SCREEN1_PATTERN_TABLE);
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for(i=0;i<256*8;i++) {
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POKE(VDP_DATA, 0);
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// nops here?
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}
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// fill color table with $1F
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set_vram_addr(SCREEN1_COLOR_TABLE);
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for(i=0;i<32;i++) {
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POKE(VDP_DATA, 0x1f);
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// nops here?
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}
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}
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