I keyed in the ROM from patent US4051605 and visually transcribed the bits from the Quiz Kid Racer die, and the byte histograms match, so it is the same code. Now I'll figure out how to map the bytes.

I uploaded info on the TMS1400 from Coleco Talking Teacher: www.seanriddle.com/tms1400.html and the CD2704B from Speak and Math: www.seanriddle.com/speakandspell.html

Lost Treasure has M34038-N2LL DES 8218.

My Talking Computron is the same as plgDavid's; 2 globs on a daughterboard marked CPU and one glob on a daughterboard marked ROM. The 12 lines to the ROM PCB also go to the cart connector.

Last edited by seanriddle; 01/30/16 09:20 PM.