<IIRC you're supposed to jumper some variable number of the diodes, dependin <on how much load there is (I think depending on whether you had installed <the extra 9368s/FND503s (?) for the address display option). REALLY cheesy The displays ate 90% of the power. <And the 1802 ran at nowhere near its full speed, because evidently that's <not possible with only a 5V supply. At VCC=VDD=5V the part would run all hte way to 3.2mhz. They claimed at 10V it would 5-6mhz but don't believe it. I have one of the 10V parts and the cmos is so slow that some of the signals come out a full clock behind (and 155ns clock)! Keep in mind CMOS then was silicon gate and something like 6-10micron rules, can you say SLOWWWWW. The SOS (silicon on sapphire) part was a bit better. FYI: people that used the SOS part werent going for fast as it's main appeal was low power (~10mw) and it was RAD hard. Allison