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Latest posts

• TWIN OS reverse engineeredNovember 17, 2024
  After many hours and lots of puzzles and assumptions I finally released the reverse engineered sources for the operating system of the Signetics TWIN microprocessor development system. And not just one, but two for good… Read more: TWIN OS reverse engineered
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  P1 DOS now availableSeptember 29, 2024
  I am working on so many separate projects that I forgot that P1 DOS –my improved and more usable version of Central Data DOS– was not published on the website yet. This oversight has now… Read more: P1 DOS now available
• asm2650 version 2September 15, 2024
  I just published version 2 of the asm2650 assembler. This is a major update that includes a number of features that have been on my wish list for a long time: And loads of smaller… Read more: asm2650 version 2
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  25 disk images addedJuly 12, 2024
  All 25 disk images of the floppies that came with the HM system can are now available for download.
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  TWIN printer is workingJuly 6, 2024
  The TWIN printers have been restored to working order. See what work needed to be done, and a short video of the machine in action.
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  A TWIN emulatorMarch 29, 2024
  My work on restoring Signetics TWIN systems just got a nice boost from a project by Amigan Software: an emulator for the TWIN system. And therefore for its sister systems as well: the Millennium Information… Read more: A TWIN emulator
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  New TWIN discoveredMarch 2, 2024
  Yesterday I received a real treasure: a complete TWIN system including a full set of documentation and lots of floppy disks! I am really excited about this machine, especially since it came with the TWICE… Read more: New TWIN discovered
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  The TWIN terminal is workingJanuary 19, 2024
  Yeah! The terminal of my Signetics TWIN is working now. I had to replace most of the capacitors in the power supply. Also replaced two toggle switches at the back which were broken off by… Read more: The TWIN terminal is working
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  I bought 8″ floppies 🙂December 16, 2023
  The Signetics TWIN system uses massive 8 inch floppies. It came with two floppies, but for experimentting I need more. From Ebay I managed to buy three of those from a seller in Italy. Looking… Read more: I bought 8″ floppies 🙂
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  Website overhaul – Signetics 2650 systemsDecember 7, 2023
  I have been maintaining a website dedicated to the Signetics 2650 microprocessor at https://ztpe.nl. This site started as a collection of hand-crafted HTML pages. Now, with two additional systems (an Instructor 50 and a rare… Read more: Website overhaul – Signetics 2650 systems