Category Archives: Vintage Computer

Sharp MZ80B – Boot-Disc, RAM/ROM-Disc, YM2149 Sound

Posted on July 28, 2021 by schrievkrom

After cleaning these old computers, I decided to create a first card for those systems – hoping, that they might work: Summarize: a) The YM2149 is located at 0x60/0x61 and is feeded by the 4 MHz system clock (therefore a … Continue reading →

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Sharp MZ80B, Starting old computer and capacitor exploded :-(

Posted on July 4, 2021 by schrievkrom

Pretty bad … today I started my old Sharp MZ80B (Z80, 64 KByte) 2 times and suddenly with a crash the system stops working. The power system stopped working: So I took the time to open it and clean it … Continue reading →

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MiniITX-Z180 under Testing

Posted on May 28, 2021 by schrievkrom

So, base tests are running and most of the PCB is working. The only part not tested yet is the I2C subcomponent. The DualPorted RAM is working … but the SD-Card connector has the wrong connections … mirrored. So, the … Continue reading →

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Next PCB – a MiniITX based Z180 computer

Posted on May 11, 2021 by schrievkrom

So, the next hardware project is waiting for testing …

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Start building a new vintage computer system

Posted on February 2, 2021 by schrievkrom

I jumped on the train to build a MC68K oriented computer system. Based on the work of Steve Crompton I start building such a system, adding new own cards and at the end I hope to have GEM oriented UI … Continue reading →

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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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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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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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