Thanksfor the pushes in the right direction. I'm probably in WAY over my head. Definitely not the LAs, ZAPs, CLCs ... that I'm familiar/comfortable with and that stuff has gone stale over the 2+ years, since retirement. In any event, I downloaded the Git archive.
It turns out that page 90 of the chipset PDF contains the requisite memory map info. The reference Felix previously supplied is for the 286/386SX (16 bit) version of the chipset. I'm dealing with the 3 IC, 386DX (32 bit), version. The machine has 8 sockets for 9 chip, 30 pin, SIMMs, which works out to a pair of 32 bit banks plus parity. Right now, 20 MB (4X 4 MB & 4X 1 MB "slugs) are present and getting to 32 MB is easy. Getting to 64 MB means using 4 16MB "slugs", in a single 32 bit bank, and that could be a "pipe dream".
Further "digging" into the PDF triggered a memory. IIRC, the OEM BIOS is QUADTEL.
I don't have a digital electronics bench. My bench, such as it is, is for analog stuff. If you Google my name, you will find I have a presence in the audio hobby.
Eli D.