I have decided to publish some of my “archaeological” work from last year on Cy Endfield’s MicroWriter. The original objective was to produce a cycle-accurate emulator. I do not currently have the free time to complete this project, so I will post my results here for anyone who might care to pick up the torch. Click on some of the images to see the full-resolution version.
MicroWriter Circuit Board (Top View)
MicroWriter Circuit Board (Bottom View)
MicroWriter Reverse-Engineered Schematic. (Click to view.)
MicroWriter Reverse-Engineered Schematic, Eagle-ized. Not 100% Complete! (Click to view.)
MicroWriter EPROM Close-Up.
MicroWriter RomSucker Circuit. Easy to build, Applicable to Other Vintage Devices. (Click to view.) IC1 is an '8255A.'
Results of RomSucker:
MicroWriter RomSucker (Breadboard.)
And now for something completely different:
A very basic web-based emulator of Endfield’s chording system. (Supports lower-case alphabet only.)