18 Mar
1998
18 Mar
'98
11:35 a.m.
On Wed, 18 Mar 1998 10:41:19 -0600 (CST), you said:
Ok, so I swapped out the 7474 with a socket (checked) and a 74LS74 and I
get the exact same behavior...all the input signals are the appropriate
voltages but the outputs are still reversed.
This means, of course, that either there are some 'sneaky fast pulses' on
one of the input lines or that Q on the 7474, which is connected to pin 2
(not halt) of the 6800 is grounded. I've checked and it's not physically
grounded.
I don't remember the original post but; try pulling the chip and
bending the Q pin so it doesn't go in the socket. That should give you
a (floating) high.
_______________
Barry Peterson bmpete(a)swbell.net
Husband to Diane, Father to Doug,
Grandfather to Zoe and Tegan.