Am9511 APU

Characterising Am9511A-1 APU

I’ve built two hardware solutions supporting the AM9511A APU. Partly for historical enjoyment, and partly because the AM9511A is actually still faster at floating point and 32-bit long arithmetic than “modern” Z80 devices. I’ve built a Z180 based board, the YAZ180, which runs the AM9511A at 2.304MHz. And I’ve built an APU Module for the […]

Yet Another Z180 (YAZ180 v2)

Testing on the YAZ180 v1 , shown below, is now complete. I don’t want to use it for further driver and platform development, because the PLCC socket for the 256kB Flash is becoming worn-out. It will continue to operate as an augmented Nascom Basic machine, with an integrated Intel HEX loader (HexLoadr) supporting direct loaded assembler or […]

Yet Another Z180 Project (YAZ180)

I’m thinking about a new project, something a little unusual but still with a rich history of information upon which to base the build. On Tindie, I found the RC2014 project which is a build of a Z80 platform but based on some modern components. That got me thinking. My next project must be a Z80 […]

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