520 STFM 256kx4 DIL to 1Mx4 SOJ

[gman]

1: what's the resistor on the cable "manually connect A9 (pin 5) to the unused MMU pin 64."?

When you upgrade the RAM from say 1MB to 4MB you need a extra address wire, which is what A9 is. Basically without it, your new chips would be "stuck" with 1MB for example.

Thanks for the reply, Did I miss read your store page and you don't sell a 4MB RAM kit for this board?
This is pretty good info here, but having the correct parts and a more detailed guide would be great!

[exxos]

Thanks for the reply, Did I miss read your store page and you don't sell a 4MB RAM kit for this board?
This is pretty good info here, but having the correct parts and a more detailed guide would be great!

I do not do a kit for 4MB kit for that board no.