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Thanks, @daver2 , I've got the service manual now so I'll check beforehand. It might be a while before I get an 8087 anyway as the two I ordered from Ali Express haven't been shipped so I have a feeling I'll be refunded soon, and will have to hunt down a couple more reasonably priced ones.

@clueless_engineer (Brett) it looks great. I checked the Github link from YouTube, and it seems I was already watching it! 😃

Great, many thanks for the advice. :)

@krebizfan thanks for your reply - I should have downloaded the Service Manual before posting! I was really planning to install the 8087 to play around, and see what I could do with it. The machine is always plugged into the mains, and is never run from batteries, so that shouldn't be a problem...

Hi there, Although I haven't opened my PPC 640 yet, I saw on oldcrap.org that there is a slot underneath the CPU which appears to be for a math coprocessor: As the V30 CPU runs at 8MHz, I was thinking of fitting an 8MHz D8087-2 into the empty slot. Does this seem like it would work? Has...

Many thanks for the warm welcome, everyone. Much appreciated! :giggle:

Hi all! I'm originally from the UK, but have lived in nothern Romania for over 8 years now. I'm very passionate about my retro computers. I have my very first Amstrad CPC 464 (and the insurance replacement after I broke it as a kid!), a ZX Spectrum 48K, two Amstrad PCWs, an Amstrad NC 200, an...