Comment by rep_lodsb
10 hours ago
Well, one indication is the value loaded into EDX on reset:
9B5 BIST1 -> TMPD 0x0303 PASS2
9B6 SIGMA -> EDX
9B7 BIST2 -> TMPE TMPD XOR
9B8 SIGMA 0x3ddc0c2c XOR
9B9 SIGMA -> EAX BOOTUP_JUMP JFPUOK
0x303 = family 3, model 0, stepping id 3.
That's either a B0 or B1 according to https://www.pcjs.org/documents/manuals/intel/80386/ , or an A3 according to https://www.geoffchappell.com/studies/windows/km/cpu/precpui... , all of which are very buggy.