Monthly Archives: May 2020

What a fake – MC68010FN25

Posted on May 29, 2020 by schrievkrom

You can buy it from utsource – a chip never produced (to my knowledge):

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MSKZIO – IOPort usages

Posted on May 28, 2020 by schrievkrom

So, the idea of having a full Z180 system is on its way. Actually I do not plan to have a CP/M system somehow … that is already available for the SC126 and its pretty well done. I actually would … Continue reading →

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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 →

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Smalltalk-80 Version 2.3 – have a look at the history

Posted on May 27, 2020 by schrievkrom

Dan Banay just released project files to build an old virtual machine with an original image from 1983 – Smalltalk-80, Version 2.3. Thank you very much for that. The sources are available at: https://github.com/dbanay/Smalltalk. Have a look at the https://github.com/dbanay/Smalltalk/blob/master/README.md … Continue reading →

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MSKZIO-Bus – 2nd version PCB RAMDAC Bt450

Posted on May 24, 2020 by schrievkrom

A second version of the RAMDAC card using the Booktree Bt450. In the first version the displayed screen was sometimes influenced by the power flow around. In this version I used the design default layout mentioned in the datasheet of … Continue reading →

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MSKZIO-Bus – I2C General I/O Board and System Monitoring

Posted on May 19, 2020 by schrievkrom

So, the next card is reaching its final state. The board is a base board offering several features if you want to build a standalone computer system. Battery supported RealTime Clock based on RTC1307 (controlled via I2C) LED Controller for … Continue reading →

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Gemstone/S – Indices and Traps ….

Posted on May 18, 2020 by schrievkrom

Ha, that’s a line of code which took me some time to understand, why it fails … Here an attribute of a persistent object is set. The newly instanced object builds some indices. Now, one may think, that in “attribute” … Continue reading →

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PUM 09.70 – Improvements supporting indices

Posted on May 16, 2020 by schrievkrom

I made some improvements supporting indices on defined associations – I support now special index creation methods for Strings and Unicode-Strings. Example In the example the class STSStatisticalDataManager has an association (1:n) to instances of the class STSStatisticTotalPoint. This association … Continue reading →

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PUM 9.66 – Object Canonicalization Framework Support

Posted on May 11, 2020 by schrievkrom

In one of our Gemstone/S database project we have lots of lots of stored strings in the database. This project has been started long ago and some time ago I found an “Object Canonicalization Framework” in Gemstone/S and I thought, … Continue reading →

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The MIVAC Board

Posted on May 3, 2020 by schrievkrom

Here is a newer video, showing the progress in software driing the ACRTC/MIVAC Board:

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