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Hercules fixes (and implemented undocumented behavior where with page 1 set in text mode, characters are read from page 1 and attributes from page 0), closes #1562.

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This commit is contained in:
OBattler
2021-07-28 05:12:35 +02:00
parent ca6863540c
commit f52a688713
1 changed files with 15 additions and 14 deletions
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29
src/video/vid_hercules.c
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@@ -138,21 +138,21 @@ hercules_out(uint16_t addr, uint8_t val, void *priv)
case 0x03b8:
old = dev->ctrl;
if (!(dev->ctrl2 & 0x01) && !(val & 0x02))
val = (val & 0xfd) | (dev->ctrl & 0x02);
if (!(dev->ctrl2 & 0x02) && !(val & 0x80))
val = (val & 0x7f) | (dev->ctrl & 0x80);
/* Prevent settings of bits if they are disabled in CTRL2. */
if (!(dev->ctrl2 & 0x01) && (val & 0x02))
val &= 0xfd;
if (!(dev->ctrl2 & 0x02) && (val & 0x80))
val &= 0x7f;
dev->ctrl = val;
if (old ^ val)
recalc_timings(dev);
break;
case 0x03bf:
old = dev->ctrl2;
dev->ctrl2 = val;
if (val & 0x02)
mem_mapping_set_addr(&dev->mapping, 0xb0000, 0x10000);
else
mem_mapping_set_addr(&dev->mapping, 0xb0000, 0x08000);
if (old ^ val)
recalc_timings(dev);
break;
default:
@@ -250,6 +250,7 @@ hercules_poll(void *priv)
hercules_t *dev = (hercules_t *)priv;
uint8_t chr, attr;
uint16_t ca, dat;
uint16_t pa;
int oldsc, blink;
int x, c, oldvc;
int drawcursor;
@@ -272,16 +273,13 @@ hercules_poll(void *priv)
}
dev->lastline = dev->displine;
// if ((dev->ctrl & 2) && (dev->ctrl2 & 1)) {
if (dev->ctrl & 2) {
if ((dev->ctrl & 0x02) && (dev->ctrl2 & 0x01)) {
ca = (dev->sc & 3) * 0x2000;
// if ((dev->ctrl & 0x80) && (dev->ctrl2 & 2))
if (dev->ctrl & 0x80)
if ((dev->ctrl & 0x80) && (dev->ctrl2 & 0x02))
ca += 0x8000;
for (x = 0; x < dev->crtc[1]; x++) {
if (dev->ctrl & 8)
// dat = (dev->vram[((dev->ma << 1) & 0x1fff) + ca] << 8) | dev->vram[((dev->ma << 1) & 0x1fff) + ca + 1];
dat = (dev->vram[((dev->ma << 1) & 0x1fff) + ca] << 8) | dev->vram[((dev->ma << 1) & 0x1fff) + ca + 1];
else
dat = 0;
@@ -292,9 +290,12 @@ hercules_poll(void *priv)
video_blend((x << 4) + c, dev->displine);
}
} else {
pa = ((dev->ctrl & 0x80) && (dev->ctrl2 & 0x02)) ? 0x8000 : 0x0000;
for (x = 0; x < dev->crtc[1]; x++) {
if (dev->ctrl & 8) {
chr = dev->vram[(dev->ma << 1) & 0xfff];
/* Undocumented behavior: page 1 in text mode means characters are read
from page 1 and attributes from page 0. */
chr = dev->vram[((dev->ma << 1) & 0xfff) + pa];
attr = dev->vram[((dev->ma << 1) + 1) & 0xfff];
} else
chr = attr = 0;