Monthly Archives: March 2016

Building a TI-99/4A cassette deck emulator

Although many people use their PC (workstation-class) to transfer programs to their TI via playing a .wav into the cassette port, I went in a different direction. I like small dedicated devices, and thus I built a tape recorder emulator … Continue reading

Posted in TI-99/4A | Leave a comment

HRD+ 74259 Daughterboard verified good

The subject says it all, really. I got ahold of a couple of 74LS259D SMD chips, soldered them into the adapter board, and replaced the ‘259 stack in the HRD+ with the daughterboard. Since nothing ever works correctly the first … Continue reading

Posted in Horizon, TI-99/4A | Leave a comment

Daughterboard replacement for Horizon HRD+ chip stacks

Earlier, in my article about refurbishing an old Bud Mills Horizon HRD+, I asked why TI gear (both official and homebrew) tended to stack similar chips on top of each other, straightening pins out, and using flying wire to connect … Continue reading

Posted in Horizon, TI-99/4A | Leave a comment