Reply 40 of 42, by DistWave
I found this thread today. It seems that I got the same kingston sx/now upgrade to make similar experiments. I replaced the 386sx with a TI486SXLC40 (5v part, it can run in a 40 MHz or 20 MHz system ,with 2x internal clock multiplier)
This cpu runs really hot a lot more than the original 386sx... I'd put a heatsink. It has the metal pad below, but it is not making contact with the PCB.
The main problem is that when I enable the internal 8kb cache I get an "A20 hardware error" and the system hangs (tested in a generic 286 12 MHz PC motherboard with SUNTAC chipset). The "external" 16 kb cache present in the upgrade can be enabled without problems.