Picture of a drill

Jeff Frohwein's Technical Page

Circuit Central

Circuit Cellar, Circuit Cookbook Archive, Simple EPROM Emulator circuit.

Digitalker Information

The Digitalker® MM54104 Speech Synthesizer chip produced by National Semiconductor plays back highly-compacted sampled speech. They have several speech roms available for this synthesizer. I have disassembled the SHRL and the SSR1 speech roms in an attempt to create my own speech rom libraries. I am fascinated by this synthesizer because of the tremendous compacting methods that are employeed and discussed in U.S. Patent #4,214,125. For example, the SHRL squeezes 11 sampled words in a 2K byte rom image.

Video Games

Video game source code available here. Stuff for Classic Systems, ColecoVision, GameBoy, Genesis, Super GameBoy, SNES, and more.

Integrated Circuits Information

Graphical IC Pinout Index, Text IC Pinout Index, ISD sound chips, MicroController/Processor Index.

ISDN Information

This is an original creation which can also be reached through the famous 'Yahoo'!

Number Conversion Table

Convert Decimal to Hex to ASCII easily with this reference table.

RS-232 Information

'How to make a null modem cable' and RS-232 pin outs.

Robot Links

Robot Links & info.

Software Standards

Links to this terribly controversial subject are available here.

VCR+ Patent Info

This is a little bit of info on VCR+. Also, here is a shell archive for encoding & decoding the VCR+ format.

Volkswagen Beetle Information

An original work due to blood, sweat, and tears! (Actually, I don't remember any tears.)