Yeah, that looks like quite the effort; thanks, Henner! But I'm looking for that better scan of the original 'classic' schematic and it seems to no longer be at that location; any chance it's still available somewhere?
TIA, m ----- Original Message ----- From: you got me To: [email protected] Sent: Friday, July 29, 2022 11:23 PM Subject: Re: [M100] TRS-80 Model 100 schematic transcribed to KiCAD The job you did must have taken a loooooooooooooooooooooong time. Perhaps some people will be able to make a M100 kit in time for the 40th anniversary. Thank you for your hard work! You were saying that the schematics you had access to were hard to read? Years ago I made a scan of the schematic in what I considered to be 'high definition'. You may want to take a look at it. TRS-80 Model 100 Main PCB Schematic (from Tech Ref Manual).jpg ------------------------------------------------------------------------------ From: M100 <[email protected]> on behalf of Henner Zeller <[email protected]> Sent: Saturday, July 30, 2022 2:11 AM To: [email protected] <[email protected]> Subject: [M100] TRS-80 Model 100 schematic transcribed to KiCAD Hi, I recently got a TRS-80 Model 100 and for fixing the the main-board I poured over various scans of the original schematic found on archive.org; and while it is great that these exist, the original schematic is still somewhat hard to read, so I decided to transcribe them to a modern schematic format - KiCAD I put the schema and symbols file as well as a generated PDF on github https://github.com/hzeller/trs80-100-schematic Status: Transcribed the full main-board (not the LCD board). All BOM entries (number+value) match with the list found in the documentation, all pin-assignments are accurate. Even deduced some values that are missing in the schematic (R162, 100Ohm discharging C78 in the reset circuit, as well as the designator for the 10n capacitor near the primary in the power supply .. C62). Schematic passes electrical rule check, so at least there are no obvious mistakes in there. I tried to keep the original layout as much as possible for easy recognition, but did slight changes to improve readability. For instance, I added a gap between the 'analog' and 'digital' part so that it is possible to print out on two sheets and glue together without losing content (or simply folding a large print-out without damaging important stuff). Also using IEC resistor symbols for readability and changed capacitor units where nanofarad is better (3300pF -> 3.3nF; 0.047μF -> 47nF); they didn't seem to use 'Nano' back in the day. Renamed some signals to be more useful, so `Ⓐ*` is now `RDRW*`. Used color encoding for the different buses on the system to easier see what is going on at a glance. If you find any mistakes (I am sure I missed something), please file an issue in the github's issue tracker. Cheers, Henner.
