Interesting memory board...

[rvdbijl]

Does anyone know what this is? And can point me to dip settings?
This came from a Corona PC-400 and appears to fill the gap from 8000H to AFFFH (yielding 704K memory on bootup).
No brand name, and no part number on the board. And only 8 out of the 18 IC slots filled....

 

[Ruud]

I don't know this board but maybe I can answer some questions:
- If it filled the gap starting from 8000h to 0B000h, only 192 KB are needed. And that number fits inside one bank of 256 KB.
- There is only one dip "up", number 5. 5, 6, 7 and 8 could make "1000" = 8. Could these four bits be the starting address? Just a guess...

 

[alecv]

82S137 is an EPROM implementing decoder and address selection
https://datasheetspdf.com/pdf/551116/NXP/82S137/1

9'th chip is a parity

 

[rvdbijl]

Thanks guys. Definitely good things to look at.. Guess experimenting it is!

And yeah, I figured there was no parity enabled on this board...