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Change BIOS equipment list to indicate DMA not supported on PCjr machine type, which fixes PCjr detection in old versions of Ancient Art of War, although DMA hardware emulation is actually still present.

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Set PC speaker initial state in BIOS init, fixing beeps when the speaker is turned on and off without first programming the timer, such as in Koei's Ghengis Khan.

Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@3954
This commit is contained in:
ripsaw8080 2015-11-14 13:42:16 +00:00
parent 966c376302
commit bfd180f5ae
1 changed files with 6 additions and 0 deletions
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6
src/ints/bios.cpp
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@ -1248,10 +1248,16 @@ public:
}
// PS2 mouse
config |= 0x04;
// DMA *not* supported - Ancient Art of War CGA uses this to identify PCjr
if (machine==MCH_PCJR) config |= 0x100;
// Gameport
config |= 0x1000;
mem_writew(BIOS_CONFIGURATION,config);
CMOS_SetRegister(0x14,(Bit8u)(config&0xff)); //Should be updated on changes
/* Setup PC speaker initial state - real BIOS does this for POST beeps */
IO_Write(0x43,0xb6); // PIT 2 mode 3
IO_Write(0x42,0x28); // counter 1320
IO_Write(0x42,0x05);
/* Setup extended memory size */
IO_Write(0x70,0x30);
size_extended=IO_Read(0x71);