Changeset 94642 in vbox

Timestamp:

Apr 20, 2022 8:27:48 AM (3 years ago)

Author:

vboxsync

Message:

VGABIOS: Filled in mode table entries 0Bh/0Ch but left disabled because they cause more harm than good (see comments in file).

File:

• trunk/src/VBox/Devices/Graphics/BIOS/vgatables.h (modified) (2 diffs)

trunk/src/VBox/Devices/Graphics/BIOS/vgatables.h

@@ -236 +236 @@
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 },
+#if 0
+/* XENIX 2.2 uses mode entries Bh/Ch when loading EGA fonts. If they are
+ * all zeros, fonts can't be set. However, some versions (XENIX 2.2.3b)
+ * end up programming garbage into the fonts. We're better off with
+ * cut off VGA fonts than with complete garbage, so we leave these
+ * mode table entries zeroed.
+ */
+{
+ /* index=0x0b EGA font load fake mode (color) */
+ 80, 24, 8, 0x1000, /* tw, th-1, ch, slength */
+ 0x01, 0x04, 0x00, 0x07, /* sequ_regs */
+ 0x23, /* miscreg */
+ 0x70, 0x4f, 0x5c, 0x2f, 0x5f, 0x07, 0x04, 0x11,
+ 0x00, 0x07, 0x06, 0x07, 0x00, 0x00, 0x00, 0x00,
+ 0xe1, 0x24, 0xc7, 0x28, 0x08, 0xe0, 0xf0, 0xa3,
+ 0xff, /* crtc_regs */
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x0f, 0x00, /* actl_regs */
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00, 0xff, /* grdc_regs */
+},
+{
+ /* index=0x0c EGA font load fake mode (mono) */
+ 80, 24, 14, 0x1000, /* tw, th-1, ch, slength */
+ 0x01, 0x04, 0x00, 0x07, /* sequ_regs */
+ 0xa6, /* miscreg */
+ 0x60, 0x4f, 0x56, 0x3a, 0x51, 0x60, 0x70, 0x1f,
+ 0x00, 0x0d, 0x0b, 0x0c, 0x00, 0x00, 0x00, 0x00,
+ 0x5e, 0x2e, 0x5d, 0x28, 0x0d, 0x5e, 0x6e, 0xa3,
+ 0xff, /* crtc_regs */
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x0f, 0x08, /* actl_regs */
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00, 0xff, /* grdc_regs */
+},
+#else
 {
  /* index=0x0b no mode defined */
@@ -258 +294 @@
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 },
+#endif
 {
  /* index=0x0d vga mode 0x0d */