How to reliably identify the STPC Atlas (cpuid)

roger2399 · ‎2004-01-11

Posted on January 12, 2004 at 08:43

roger2399 · ‎2004-01-11

Posted on January 12, 2004 at 06:46

STPC lacks the cpuid instruction (available in Pentium and forward)

Is there an other way to identify it?

I have to be able to determine if it is a STPC or an other 486 based

processor (intel).

Of cause I can try to identify it by reading data from ports that does

not exist on the 486 like USB - but then we run into the same problem

when we change processor the next time...

/RogerL

roger2399 · ‎2004-01-11

Posted on January 12, 2004 at 08:43

Found it.

Register DIR0 (DEVID)

Described in ''Standard 486 Processor Core Programming Manual''

Chapter ''4.4.4.4 Configuration Registers''