Monthly Archives: July 2020

How to control an USB keyboard ?

Posted on July 30, 2020 by schrievkrom

When working with old computers a question remains – how to build old computers and use new equipment ? I looked for some chips (e.g. CH376s) to have access to USB-sticks, but I actually think, that using a PIC24 microcontroller … Continue reading →

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From my History of the Internet

Posted on July 18, 2020 by schrievkrom

When looking around for old stuff in my house, I’ve found an article published at 18.10.1990 in the “Kieler Nachrichten” in Kiel, where I’ve been a student those days studying informatics. There were some students trying to bring net news … Continue reading →

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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 →

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Get up early and take a look …

Posted on July 13, 2020 by schrievkrom

… even though the nature does not look as on some pictures – its still the nature with its wonderful events: Even though the comet is now circumstellar, you should take the chance now – here in Germany at 01:00 … Continue reading →

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MSKZIO – RAMDAC Card based on STG1700

Posted on July 5, 2020 by schrievkrom

Here is my second RAMDAC card for my MIVAC card, it is thought to be a possible replacement for the Bt450 RAMDAC card. The Bt450 is harder to get and much more expensive. The STG1700 is more powerful than the … Continue reading →

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MSKZIO – MC68882 FPU working revision

Posted on July 3, 2020 by schrievkrom

So, here is the third edition of the PCB and its working — puuh. So, here is the card running in the extension slot of the SC126 via an adapter: Here is a protocol of to communication between the Z180 … Continue reading →

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Adapter MSKZIO RC2014 (2×40)

Posted on July 2, 2020 by schrievkrom

I have still pretty much hardware (backplanes) for the original RC2014 and lots of backplanes for the 2×40 bus. So I thought it would be nice to have adapter PCBs, to use my MSKZIO in those other backplanes. And here … Continue reading →

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