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sms vdp, support 224/240 line mode

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This commit is contained in:
kub 2021-10-06 19:45:01 +02:00
parent 3bfee02717
commit 4b3e9d92e3
2 changed files with 9 additions and 5 deletions
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10
pico/mode4.c
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@ -232,14 +232,18 @@ static void DrawDisplayM4(int scanline)
// Find the line in the name table
line = pv->reg[9] + scanline; // vscroll + scanline
line &= 0xff;
// Find name table:
nametab = PicoMem.vram;
if ((Pico.video.reg[0] & 6) == 6 && (Pico.video.reg[1] & 0x18))
if ((pv->reg[0] & 6) == 6 && (pv->reg[1] & 0x18)) {
line &= 0xff;
nametab += ((pv->reg[2] & 0x0c) << (10-1)) + (0x700 >> 1);
else
} else {
while (line >= 224) line -= 224;
nametab += (pv->reg[2] & 0x0e) << (10-1);
// old SMS only, masks line:7 with reg[2]:0 for address calculation
//if ((pv->reg[2] & 0x01) == 0) line &= 0x7f;
}
nametab += (line>>3) << (6-1);
dx = pv->reg[8]; // hscroll