ericpskl

The error log out of Xgpro isn't very helpful: @pcrock, what are the voltage and timing settings that you used to program the AM2732B on your Willem? I've tried to increase the programming voltages and timeouts, but nothing worked. Thanks!

Stephen, I owe you a pint! Followed your instructions and found that the RIOT reset pin (PIN 34) was at 0.4 volts. Pin 34 connects through a 22K (R227) pullup to +5V with a 0.1uF bypass cap (C238) to ground. Pulled and tested both components and found the cap was bad. Replaced the cap and she booted right up!

I have an Atari 2600 (Darth Vader, CX2600A) that I've been trying to repair. Symptoms: With a known good cartridge inserted, I get a good RF signal on the TV, but only have a black screen. Logic probe shows pulsing on the clock pins, but no pulsing on any address or data lines. Clock frequency matches that of a good 2600. All three major chips check out okay -- they are socketed and work fine when installed in another 2600. Good +5V coming out of the voltage regulator. Known good external power supply. All contacts cleaned multiple times. Any recommendations on what to check next would be appreciated!

Can anyone confirm whether or not they are able to program AMD AM2732B EPROMs on a TL866II + programmer? This model is in the supported EPROM list for the programmer, but I haven't been able to program any of the EPROMs that I purchased from eBay. They don't appear to be rebranded or painted (acetone test). Spec sheet shows VPP at 12.5 volts, so the TL866II+ should be able to handle them just fine. Programmer works fine on other EPROMS. Any ideas?