22 Apr
2007
22 Apr
'07
9:51 p.m.
I've never worked on a KY11, but I might have to one day... And I've got
a minimal 8008 data sheet in front of me.
I looked at the docs and schematics and followed the
wise words on page 8-2
titles "M7859 FAILURES"
I have +5 and -9 on the 8008 as well as clock(s). But the "INTR" line
(pin 18) is stuck high. I assume this is the problem.
[aside - I plugged one of the cables (J3) in backward and got the display to
show all zeros', but the scan rate was *very* slow, light 10hz; I found
that interesting]
STOP L and TS1 L are inactive, as are all the S0,S1 & S2 on the 8008.
Interestingly ping 14 is wiggling. I don't have a databook with with
an 8008 in it and that pin is not labeled.
Pin 14 is 'Sync' 'It indicates the begining of a machine cycle"
What is 'ready' -- pin 17 -- doing?
Alas my data sheet, which is really only an introduction, doesn't give
what the Sn lines should be doing. Are yours all stuck in the same state,
if so what state?
Now, Intr -- pin 18 -- is active high, and an input. If it's stuck high,
that might be confusing thigs. What drives it, and why is it high?
-tony