🚀 go-pugleaf

I posted a question regarding the identification of a 386SX CPU
versus a 386DX a couple of weeks ago.  I finally talked to one of 
the designers and found that the hardest way is the only way:

1. Time a bunch of NOP's (don't loop'em)
2. Time a bunch of DWORD memory accesses (don't loop)

The 386SX has a 2 clock penalty for DWORD moves (naturally, since
the CPU has to move 2 words) versus the 386 which has no penalty.
The default timing for a MOV [MEM], REG is 2 clocks,  thus an
SX should work about 4 times longer on the MOV's than on the NOP's.

Of course timing should be done with the 8253 clock 2 and INT's
should be disabled.

This is only theory and I still need to put it to work.  Unfortunately
I can't release the code,  'cause it goes to commercial purposes.
I hope this helps some of you who asked me for the solution in case
I found one.

Aki.
-- 
/  Phone: 408-662 9664   Fax: 662 9676  |  "Aki" pronounced: Ah-Key. I know  \ 
\  125 Searidge Ct #D, Aptos, CA 95003  |  what I'm doing most of the time.  /