... there's always "but".

The motherboard is this one (TRW's match). It has Suntac ST62C00x (C008) chipset. I made my own "user manual", since there's none on the i-net.

I got the board with AMD N80L286-16/S CPU running at 12 MHz (in "turbo" mode) and 1 MB of on-board DRAM installed. I changed the BIOS to MR BIOS version 1.65 (1994 MR BIOS V1.65 STD_286 Generic (non-Chipset) 286 / 386 /486), since the original Award BIOS v.3.03HL is a total cr*p. There are 8 Vitelic V53C104P12L DIP-20 RAM chips (256x4) installed for a total of 1 MB of memory:

Since the AMD CPU is originally 16 MHz one and I read, that this Suntac ST62C00x (C008) chipset can work at 16 MHz maximum, I decided to upgrade the motherboard with 32.000 MHz crystal oscillator (the original one is 24.000 MHz) for 16 MHz "turbo" mode. And I did it. But now there is a problem with the on-board DRAM. Originally these DRAM chips (120 ns access time) were capable to work at 12 MHz with wait state 0 setting, but after I changed the crystal oscillator, they refuse to work with wait state 0 setting, so I set DRAM wait state to 1 and now everything works. The CPU gained 33% performance boost, but the RAM lost some performance from 0 to 1 wait state switching, and the overall system performance is now slightly lower compared to the original 12 MHz configuration with DRAM wait state set to 0.

The question is: What 256x4 DIP-20 DRAM chips capable to work with DRAM wait state 0 setting should I get, since the original 120 ns ones can not work with WS set to 0 at 16 MHz? 100 ns, 80 ns...?

And the second question: Is there any 512x4 or 1Mx4 DIP-20 DRAM chips for 2 or 4 MB memory upgrade, because 1 MB is not enough and the board doesn't have SIMM slots?

P.S. I think, DIP-20 SRAM chips should be even better option, since SRAM does not need any refresh cycles.

Those ISA RAM-cards are not an option, since they have insane price tags on the local online flea-markets.