Author Archives: ECNeilson

Z80Pack CP/M Emulator and NZ-COM

Z80Pack by Udo Munk is a great CP/M emulator.  It will emulate a number of hardware architectures including the Altair and IMSAI systems, but I primarily use it CP/M development environment.  I can quickly write or edit CP/M programs and on my … Continue reading

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Repairing an 8″ Floppy Drive

When I first powered up the Z-100 for testing, everything worked except one of the 8″ disk drives, a Tandon TM848-1E.  The drive light would make three short flashes, then one long flash and was not detected by the OS … Continue reading

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Z-100 Manuals Scanned and Uploaded

I’ve finished scanning a batch of the Heath-Zenith technical manuals in my collection, many of which were not previously available online. I’ve also added manuals from other online sources that relate to the Z-100.  What follows is a fairly complete set of … Continue reading

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New Vintage Technology Site Online

It was high time to upgrade the site from hand-scratched HTML code to something more maintainable and scalable.  Most of the original articles have been moved over and the old antediluviandesigns.com domain now points to planemo.org.  Planemo is an astronomical … Continue reading

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Z-100 Acquired!

The Heath-Zenith H/Z-100 PC is a marvel of early 80s computer engineering. First release in September 1982, it contained both an 8085 CPU for CP/M work and an 8088 for IBM compatibility.  I acquired this system from Bill Adney who wrote … Continue reading

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Advent TurboROM

Transferring files one a time was getting a little tedious. The Kermit terminal program (there is actually a Kaypro version of Kermit) and QTerm, which also supports the Kermit protocol, both use polling instead of interrupts so I was only seeing around … Continue reading

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Dynaco ST-70 Vacuum Tube Stereo Amplifier

What vintage technology site would be complete without at least one vacuum tube project! My college engineering experience was during the 1990s and I never got the chance to learn about vacuum tubes or punch cards, or even Pascal for … Continue reading

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High Speed IMP for the PCPI SIO Card

IMP is a great little terminal program written by Irvin Hoff and I thought it could use a speed upgrade along the same lines as QTerm. The result was IMP_SIO.ZIP. Imp is much simpler than QTerm. It’s one .ASM file … Continue reading

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