26 May
2007
26 May
'07
8:36 a.m.
On Fri, 25 May 2007 22:20:56 -0500 (CDT), you wrote:
Probably it didn't trup the first time you put the
back in, when you
re-iserted it, and re-cloxsed the cover, it worked. You might want to
look at this, tweak the adjustments, etc.
-tony
Naturally, I jinxed it by bragging about my success :(
The next day, the system wouldn't boot and I could see the FAULT
light flicker as the system halted at address 10107. I initially
thought disk drive problems again, or the pack got clobbered
during swap-out for some reason.
However, a little investigating quickly showed that even the most
basic ten-word TTY check program would not deposit or run. In
fact, when depositing or examining sequential locations I found
the address display would increment from 0200 to 0001. 0577 would
increment to 0400, etc. So something is wrong with address bit 4.
I pulled all the boards from the backplane except the CPU set and
it still does it. Now I've got to fix the hardware! Sigh.
Meanwhile I have been SIMH-building a new OS/8 image from scratch
for two drives. After much struggle I have the RL20 handler
installed (which has logical drives R20A,B,C,D; the RL21 handler
with R21A-D, and I had to omit the last 20% (the "E" drives on
RL2E) because OS/8 can only allow fifteen handlers and space is
needed for (at least) the R2SY system handler, TTY, SYS and DSK
also... reminds me of Gates' "640K should be enough for anyone".
-Charles