Hi Michael,
Big compliments, as you have achieved the next to impossible,
even if it still has some trouble with NIOS,DOS4/GW,...
I never thought it possible to make EMM386 VCPI compatible
at all.
on VCPI memory allocation: (I'm not an expert in VCPI)
IMO setting aside 256K on a 4M maschine (if they still exist)
512 on 8M and 1M for everything else for VCPI's exclusive
use shouldn't trouble anyone, but still give VCPI enough memory
to be usable
Scanning for EPROMS:
IMO, the scanning should be:
/* scan for ROMS */
for (mem = 0xc000; mem < 0xf000;)
{
uint romsize;
uchar far *pmem = MK_FP(mem,0);
if ( pmem[0] != 0x55u || pmem[1] != 0xaau)
{
/* no adapter EPROM */
mem += 2048/16; /* advance by 2K */
continue;
}
- romsize = pmem[2] / 2;
+*****
if (pmem[2] == 0)
romsize = 2; /* there was a valid EPROM signiture
!! */
else
{
/* By definition, EPROMS are located
on 2K boundaries.
so in any case, the search pointer
must remain 2K-aligned
*/
romsize = ((uint)pmem[2] + 3) / 4 * 2;
}
+*****
if (startup_verbose)
printf("EPROM at %p, size %u KB\n", pmem, romsize);
/* romsize given in
512 byte*/
for ( i = 0; i < romsize; i+=2)
{
SetMemoryType(mem,'E');
mem += 2048/16; /* advance by 2K */
}
}
with big compliments
tom
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