IBM 5140 - schematics?

Forgive me for replying to a nearly month-old post. You definitely want the "serial/parallel" slice option. They are relatively cheap on eBay. Besides all of the goodness of the serial port, you can also get a Xircom PE3-10BT Ethernet adapter that attaches to the parallel port and connect it to a modern network. Using it as a terminal is cute. Running telnet on it natively and playing Netris is cool. :-) On a slightly different topic, the tech ref describes the interface to the LCD screen. I have a few bad LCD screens - they have lines through them. I've thought about trying to debug them, but the thought of just replacing them outright with newer tech that can do color is really appealing too. (The original screens are LCDs, sometimes with a backlight option. But they can do greyscale, so detecting the levels and doing color should be feasible.) On Sat, Apr 28, 2018 at 7:57 AM, Anders Nelson via cctalk < cctalk at classiccmp.org> wrote: