Último mensaje de la página anterior:Here's a recreation of the 63C09 card:
富士通 FM-7/77用HD63C09Eカード製作 その1
Oops, malikto999 already posted the same link
...but no schematic or Gerbers are made public. No GAL jed files either...
It's a really cool hardware. Seems that it can be switched to even 6Mhz!. Here're some benchmarks
Btw, I can't see too many socketed chips in the 77AV. I'm afraid that you'll need to desolder the CPUs just to test it .
The FM77AV40SX has some kind of "turbo" mode (only two POKE commands or pressing TAB when booting) just disabling some wait states when using the MMR. Seems that the gain is about a 25%. I've tested it and it really works.
EDIT: Oh, and I've tested the replacement of the main/sub CPUs of the FM-7. Replacing the main CPU with a HD63B09P gives me a flashing cursor and nothing more. If I replace the SUB cpu, only black screen.
...and guess what?, it's the same behaviour that I get when I try with a HD63C09EP(the CoCo/Dragon ones); so I'm 99% sure that I've a nice batch of fake chinese HD63B09P CPUs! ,all of them are, probably, EP CPUs