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Amend previous Hercules change so the MDA-compatible address wrapping is used only when graphics are disabled, but still only in 32kB mode. Thanks TheGreatCodeholio, and thanks Great Hierophant for testing on a real Hercules card.

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@3903
This commit is contained in:
ripsaw8080 2015-03-13 12:42:12 +00:00
parent bd6e01565d
commit 8a464fb312
1 changed files with 6 additions and 2 deletions
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8
src/hardware/vga_memory.cpp
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@ -803,8 +803,12 @@ void VGA_SetupHandlers(void) {
MEM_SetPageHandler(VGA_PAGE_B0,16,&vgaph.map);
} else {
vgapages.mask=0x7fff;
/* With hercules in 32kb mode it leaves a memory hole on 0xb800 */
MEM_SetPageHandler(VGA_PAGE_B0,8,&vgaph.herc);
// With hercules in 32kB mode it leaves a memory hole on 0xb800
// and has MDA-compatible address wrapping when graphics are disabled
if (vga.herc.enable_bits & 0x1)
MEM_SetPageHandler(VGA_PAGE_B0,8,&vgaph.map);
else
MEM_SetPageHandler(VGA_PAGE_B0,8,&vgaph.herc);
MEM_SetPageHandler(VGA_PAGE_B8,8,&vgaph.empty);
}
goto range_done;