RapidCAD steppings etc

[debs3759]

I'm currently working on a major rewrite of my x86 CPUID code and have found a bit of a discrepancy as far as the RapidCAD chipset goes.

It would appear from some documentation that I have refered to that there are two possible steppings, the A and B step, for the RapidCAD, whereas there is only one production sSpec. Can anyone confirm whether the ES was step A (CPUID 0340h) and the production version step B (CPUID 0341h). As I'm currently in the process of re-organising all my hardware and rewriting the ID code, I can't test my production chip, but I'll be surprised if there was a different stepping for the production chips to the ES. Also, I only know of SZ924/925 for the RapidCAD-1/2 (I need to look on a few sites soon to get the QSpec for the ES version...).

I am specifically (in this post) only looking for info to either confirm that there are two steppings (and help me explain the apparent discrepancy) or to show that most sites which refer to them are wrong.

If there is a datasheet and/or user manual available anywhere, I'd be grateful for a copy (I'll even add it to the list of things I'm in debt for if someone has one they will sell but hasn't got time to extract info for me...)

[pinkie]

Hi,

You can find the Qspec on Mats's collection site.
http://www.cpu-zone.com/80386.htm

[debs3759]

Thanks Yan. That has given me the QSpecs, but unfortunately it just adds to my confusion about stepping B, as both the ES and production RapidCAD-1 chips have "A-2" or "A2" on them (although the -2 chips, which are not the functional part, have "B-0" and "A0" respectively (ES/non-ES) on them.)

Hopefully I'll figure out more when I do my next batch of testing