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There are a few gotcha style errors on the board, but they only have an effect if populating the second memory layer, IIRC. I did a layout for a through-hole version of it a few years back so I could update the GERBERs to a current format, but I never really took the time to try and build/troubleshoot the test board I made.

 

The current board iteration of the SAMS does support 4M if you can get a pair of good chips, and I've been mulling over making an updated version using a pair of 8M 3V memory chips that happen to be TTL compatible. I haven't even started sussing out the necessary modifications to do that though.

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I wrote RXB 2020 so it can go up to 16 Meg using CALL SAMS(memory-boarder,page-number) anywhere in 32K of 4K pages.

Page 0 to 32768 pages in decimal, now the issue will be -1 to -32767 thus decimal pages are just like CALL PEEK or CALL LOAD.

Thus normal decimal will handle up to 8Meg, but over that negative numbers are needed for other 8Meg.

 

i.e. -32768 to +32767 pages for SAMS in RXB numbering of pages.

HEX = DECIMAL: >0000=0, >0001=1, >7FFF=32767, >8000=-32768, >8001=-32767, >FFFF=-1

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