My setup includes a TI-99/4a console black and silver and a beige one (spare), PEB with TI RS232 HDX mod, TI FDC, and a 1K SAMS. The system totally locked up yesterday and upon reboot none of my PEB cards were recognized. Finally got the SAMS card to be seen and functioned properly, but attempts to access the FDC resulted in a Error 0. Pulled all the cards and started looking at the voltage on the PEB bus and read +26V, -26V, 15V, 12V and 5V. From the specs it appears they should be +-16V and +8V on the unregulated rails. Heard of an issue like this before? Transformer issue?