2 Aug
2026
2 Aug
'26
5:40 p.m.
On Sun, Aug 2, 2026, 6:44 PM Jon Elson via cctalk <cctalk(a)classiccmp.org
wrote:
The ground was the problem. For some CRAZY reason, pin 5 of
the 9-pin serial connector of the KA630-AA and cabinet kit
has a 1K Ohm resistance to system ground. I ran a clip lead
from the cabinet to pin 5 of the USB serial cable and then
the communication works.
But, now, for the POST I get 7..6..5..4..
?24 UNXINT
consistently. Now, I don't know what to do about that. It
used to do that once in a while, but now it is on every
power-up.
Anybody know what this means?
Unexpected Interrupt. I hit that once in the late 80s when i installed a
new nic. But it's been so long i don't recall what I did. I know in VMS I
had to do a SYSGEN, but i may have had to tell the boot roms... or maybe I
had to change the csr... it's been a long time though...
Warner