The 80286 can only address 16MB of RAM. Why not just fill the memory map as standard, then there's no need for SIMM slots or any other memory expansion?
Give me a few Upper Memory Blocks for DOS, and provision for 32MB of EMS as well, and frankly for a DOS machine there is nothing left to add in terms of memory.
How much is 48 _megabytes_ of RAM in 2024? 5¢? 10¢?
about $500-1000 https://eu.mouser.com/c/semiconductors/memory-ics/sram/?memo...
>Why not just
he said the magic words!
Only because you're including RAM spec'ed at 75pS access times.
If you limit the selection to 133MHz (the slowest 'max speed' - ridiculous, you can still easily purchase NEW 50nS and 70nS SRAM elsewhere, this is why I don't buy from mouser)...
Then the price falls to £5 for a 32MB (256Mbit) chip, which isn't excessively priced, but it still more than I paid for similar chips a few weeks ago.
https://www.geeksforgeeks.org/difference-between-sram-and-dr...
Personally Im also a fan of keeping ram oldschool. I even reverse engineered a ram card for a 386 board just last week https://github.com/raszpl/386RC-16
(Re your 386 RAM board: Nice necroproject!)
More than I thought, but still, a relatively small amount for what will work out as a quite expensive retro build.