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XPRAM gets loaded with default values if "NuMc" signature isn't found. This is

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done so the correct (default) video mode is used if the PRAM was wiped.
This commit is contained in:
cebix 2002-03-19 14:25:50 +00:00
parent a42a559bf1
commit 640130c275
1 changed files with 31 additions and 1 deletions
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32
BasiliskII/src/main.cpp
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@ -102,6 +102,36 @@ bool InitAll(void)
// Load XPRAM
XPRAMInit();
// Load XPRAM default values if signature not found
if (XPRAM[0x0c] != 0x4e || XPRAM[0x0d] != 0x75
|| XPRAM[0x0e] != 0x4d || XPRAM[0x0f] != 0x63) {
D(bug("Loading XPRAM default values\n"));
memset(XPRAM, 0, 0x100);
XPRAM[0x0c] = 0x4e; // "NuMc" signature
XPRAM[0x0d] = 0x75;
XPRAM[0x0e] = 0x4d;
XPRAM[0x0f] = 0x63;
XPRAM[0x01] = 0x80; // InternalWaitFlags = DynWait (don't wait for SCSI devices upon bootup)
XPRAM[0x10] = 0xa8; // Standard PRAM values
XPRAM[0x11] = 0x00;
XPRAM[0x12] = 0x00;
XPRAM[0x13] = 0x22;
XPRAM[0x14] = 0xcc;
XPRAM[0x15] = 0x0a;
XPRAM[0x16] = 0xcc;
XPRAM[0x17] = 0x0a;
XPRAM[0x1c] = 0x00;
XPRAM[0x1d] = 0x02;
XPRAM[0x1e] = 0x63;
XPRAM[0x1f] = 0x00;
XPRAM[0x08] = 0x13;
XPRAM[0x09] = 0x88;
XPRAM[0x0a] = 0x00;
XPRAM[0x0b] = 0xcc;
XPRAM[0x76] = 0x00; // OSDefault = MacOS
XPRAM[0x77] = 0x01;
}
// Set boot volume
int16 i16 = PrefsFindInt32("bootdrive");
XPRAM[0x78] = i16 >> 8;
@ -143,7 +173,7 @@ bool InitAll(void)
if (!VideoInit(ROMVersion == ROM_VERSION_64K || ROMVersion == ROM_VERSION_PLUS || ROMVersion == ROM_VERSION_CLASSIC))
return false;
// Set default video mode
// Set default video mode in XPRAM
XPRAM[0x56] = 0x42; // 'B'
XPRAM[0x57] = 0x32; // '2'
XPRAM[0x58] = DepthToAppleMode(VideoMonitor.mode.depth);