This repository contains several very old documents i found.
Schematics from an old dutch magazine: 'Computer Bulletin Special':
- PC-100A Schematic - the TI-59 thermal printer
- TI-59 Schematic - the texas instruments calculator
Note that in the PC-100C, the powersupply is slightly different. It uses either an ua79gu1c or lm337 negative voltage regulator, instead of the transistors.
See also rskey
Once I accidentally powered my printer with 220V instead of the required 110V. Causing some discomforting noises from the printer followed by a pop, when the fuse blew. An investigation showed that the zener following the voltage regulater had melted into a short. Replacing it with another one fixed the printer.