Tag Archives: FPU

MC68882 as a peripheral – the overhead

Posted on July 16, 2020 by schrievkrom

I got an eMail today asking me, how much the overhead is to do all the I/O to the MC68882 and perhaps the I/O oerhead destroys all the speed enhancements. To speak with the MC68882, the Z80/Z180 has to do … Continue reading →

Posted in Vintage Computer | Tagged , , , | Leave a comment

MSKZIO – FPU – 2nd revision, still a problem – but solution is found

Posted on June 22, 2020 by schrievkrom

So, the 2nd revision came from China and I tested it and it still did not work – that was strange, but actually I’ve found the error. I missed one signal to invert. You can see on the picture, that … Continue reading →

Posted in Vintage Computer | Tagged , , , , | 2 Comments

MSKZIO – FPU for Z80/Z180, Playground for Pfingsten

Posted on May 28, 2020 by schrievkrom

So, the next PCBs have arrived from China – this time an attempt to connect a MC68882 FPU to my Z180 system SC126. The chip needs 32 registers for accessing and default location is (in my system) at 0xA0 .. … Continue reading →

Posted in Vintage Computer | Tagged , , , , | 1 Comment