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IBM 5550: Fix the screen res in graphic mode

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This commit is contained in:
Akamaki
2026-02-20 09:06:33 +09:00
parent 4284f15574
commit c1661b5a90
1 changed files with 8 additions and 6 deletions
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14
src/machine/m_xt_ibm5550.c
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@@ -305,7 +305,7 @@ The IBM 5550 has different IRQ assignments like the 6580 Displaywriter System.
| 40000h | 128 KB Expansion RAM Card |
| 60000h | 128 KB Expansion RAM Card |
| 80000h | 128 KB Expansion RAM Card |
| A0000h | 256 KB Video RAM |
| A0000h | Video RAM (Font 16: 144 KB, Font 24: 256 KB) |
| E0000h | 4 KB Code/Attribute Buffer |
| E8000h | ? KB Hard Disk Control Local Memory (not implemented) |
| F0000h | Kanji Font Card (not implemented) |
@@ -917,13 +917,15 @@ epoch_render_color_4bpp(epoch_t *epoch)
/*
INT 10h video modes supported in DOS K3.44.
Mode Type Colors Text Base Address PELs Render
2 A/N 3 80 x 25 E0000h 1040 x 725 text
8 A/N/K 3 80 x 25 E0000h 1040 x 725 text
2 A/N 3 80 x 25 E0000h 1040 x 725* text
8 A/N/K 3 80 x 25 E0000h 1040 x 725* text
9 APA 2 80 x 25 A0000h 720 x 512 color_4bpp
Ah APA 2 78 x 25 A0000h 1024 x 768 color_4bpp
Bh APA 16 40 x 25 A0000h 360 x 512 n/a
Ch APA 16 80 x 25 A0000h 720 x 512 n/a
Dh APA 16 78 x 25 A0000h 1024 x 768 n/a
Eh A/N/K 16 80 x 25 E0000h 1040 x 725 n/a
Eh A/N/K 16 80 x 25 E0000h 1040 x 725* n/a
(* 720 x 525 in the Font 16 system.)
*/
static void
epoch_recalctimings(epoch_t *epoch)
@@ -978,8 +980,8 @@ epoch_recalctimings(epoch_t *epoch)
epoch->hdisp *= 16;
epoch->char_width = 16;
} else {
epoch->hdisp *= 11;
epoch->char_width = 11;
epoch->hdisp *= 12;
epoch->char_width = 12;
}
/* PS/55 8-color */
epoch_log("Set videomode to PS/55 4 bpp graphics.\n");