87 lines
2.1 KiB
C
87 lines
2.1 KiB
C
byte SCREEN1_TABLE[8] = {
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0x00, 0xc0, 0x05, 0x80, 0x01, 0x20, 0x00, 0x25
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};
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// 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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const word SCREEN1_PATTERN_TABLE = 0x0800;
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const word SCREEN1_NAME_TABLE = 0x1400;
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const word SCREEN1_COLOR_TABLE = 0x2000;
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const word SCREEN1_SPRITE_PATTERNS = 0x0000;
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const word SCREEN1_SPRITE_ATTRS = 0x1000;
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const word SCREEN1_SIZE = (32*24);
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// loads the font on the pattern table
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void screen1_load_font() {
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byte *source = FONT;
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// start writing into VRAM from space character (32..127)
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tms_set_vram_write_addr(SCREEN1_PATTERN_TABLE+(32*8));
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for(word i=768;i!=0;i--) {
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TMS_WRITE_DATA_PORT(*source++);
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}
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// reverse font (32..127)
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source = FONT;
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tms_set_vram_write_addr(SCREEN1_PATTERN_TABLE+((128+32)*8));
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for(word i=768;i!=0;i--) {
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TMS_WRITE_DATA_PORT(~(*source++));
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}
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}
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// holds the cursor location for the putchar routine
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word screen1_cursor;
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// prints character to TMS (SCREEN 1 MODE)
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void screen1_putc(byte c) {
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tms_set_vram_write_addr(screen1_cursor++);
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TMS_WRITE_DATA_PORT(c);
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}
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// prints a 0 terminated string to TMS (SCREEN 1 MODE)
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void screen1_puts(byte *s) {
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byte c;
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while(c=*s++) {
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screen1_putc(c);
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}
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}
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void screen1_home() {
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screen1_cursor = SCREEN1_NAME_TABLE;
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}
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void screen1_locate(byte x, byte y) {
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screen1_cursor = SCREEN1_NAME_TABLE + ((word)y)*32 + x;
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}
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void screen1_prepare() {
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// fills name table with spaces (32)
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tms_set_vram_write_addr(SCREEN1_NAME_TABLE);
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for(word i=SCREEN1_SIZE;i!=0;i--) {
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TMS_WRITE_DATA_PORT(32);
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}
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// fill pattern table with 0
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tms_set_vram_write_addr(SCREEN1_PATTERN_TABLE);
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for(word i=256*8;i!=0;i--) {
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TMS_WRITE_DATA_PORT(0);
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}
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// fill color table with black on white
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tms_set_vram_write_addr(SCREEN1_COLOR_TABLE);
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for(byte i=32;i!=0;i--) {
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TMS_WRITE_DATA_PORT(FG_BG(COLOR_BLACK,COLOR_WHITE));
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}
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}
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