falter
Veteran Member
Darn.. couldn't be that easy. I replaced the broken 1k resistor but yeah, no change. Darn!
You leave it off in some cases if/when you expand the system. IIRC the KIM-2 RAM board I had required you to remove it.
Hi glitch,
Yes, but typically a better way of doing this would have been to design it such that an open circuit at this pin K would allow internal operation and then a ground would be required to allow for expansion. This could be accomplished with an inverter and a pull-up resistor on the DECEN signal.
-Dave
Darn.. couldn't be that easy. I replaced the broken 1k resistor but yeah, no change. Darn!
Of course, but this is old computers I'm getting ready to test a S-100 clock board that expects you to jumper whatever AC voltage is ahead of the +/-16V rectifiers onto the bus! "Sane defaults..." right?
The logic could easily be put in a 16R4 but I'm too lazy
to deal with it.
Which part is -003 and -002?
Is U2 = -002
and U3 = -003?
or the other way around?
Dwight
I checked pin 10 of U16 (7404). I do have a pulse there.
I don't know if U26 is important to be 1 or 0 for the
computer to run.
It is part of the tape read.