555 timer, big capacitors, maybe an inverter, straight to the power button. Power this with your "mains-ok" line so that any ups fucking with the auto-boot on the motherboard will be taken care of.
Self explanatory
Prevents void warranties
If you have ever been on IRC for long enough, chances are some channel you were on had a bot on it. Some bots are silly, they respond to phrases, often stuffed with inside jokes. Other bots are useful, they will tell you when things like code is pushed. Some …
The TI 89, like most calculators, uses AAA sized batteries. These vary from 1.5v in the fully charged disposable variants, to 1.2V NiMH rechargable batteries. I wanted to replace the batteries with a rechargable solution that could charge while the device is being used.
Conveniently, 5v fits nicely …
I was trying to play multiplayer doom, and not chocolate doom, where one of the machines is a dosbox and the other is a computer I built after a few months of collecting parts from recycling places. The specs: