I think that I have a faulty Cache module on my Pentium 1 board. (Did some memtest whit and whit out the Module, and some Cachechk.exe testing) Good luck is that it is a COASt module, so easy to replace. But got some questions about it.

I own a FIC PA2002 mainboard whit a Pentium 133 Mhz CPU. The manual says:

The PA-2002 accepts 256KB/512KB/1MB standard 3.3V/mix voltage asynchronous
SRAM, or 256KB/512KB standard 3.3V synchronous SRAM direct-mapped write-back
cache memory with cache module.

found here: external FTP link to FIC

Than there are 2 pictures of those modules and I consider that I own a synchronous SRAM.

On some other pages there there is told that I have to Jumper the right type of module (asynchronous or synchronous). Did not checked if it is right jumpered. What would the effect when its wrong jumpered?

After some googeling I found a German site telling me that there are different Versions of COASt modules (2.1, 3.0 and 3.1) Source= External link to Heise.de. Downwards compatible. But how can I tell what kind of modules is needed on this mainboard, and how can I see what kind of modules are for sale? At all the eBay auctions nobody said anything about versions. What could happen when installing a too low version?

How can I tell that the module is broken and not something on the mainboard? As said I did some memtesting and everything was fine without the module. Or is it more a try and error. But than, even if I get a new module, I don't know if it is in a 100% working condition or not, even if told me that they are in 100% working condition (not the first time I bought something faulty).

And than the big question, do I need more Cache? I run DOS (at this moment Novell (DR) Dos 7) and I want to use it mostly for gaming and maybe some old DOS based software and Windows 3.x. I did not plan to install any kind of windows 9x or OS/2 on it. Installed are 16 MB at this moment, max could be 128, but that is useless for DOS based programs or games. So do I benefit from spending 10 Euro's on a 512K module? eBay link

And what would be de difference between 256k and 512k?