In this project, an old IBM point-of-sale (POS) display is reverse engineered to display arbitrary text. The goal of this project is not entirely clear.
The display in question contains two rows of 20 characters each. The characters on the display are of the VFD type, in blue/cyan.
The interface to the display consists of 4 wires, probably an RS485 interface, possibly:
- power (volts?) ?
- possible protocol description: SurePOS 500 Device Commands: 2x20 Customer Display
- appendix G ("Input/Output device commands ", page 56) of SurePOS 500 Model XX3 Technical System Reference, version 1.3