21 Feb
2008
21 Feb
'08
9:21 a.m.
J. David Bryan wrote:
Thanx for the help! :)
It has the soldered in default rom (1816-0420), as well as another that
I have not yet identified (1816-0639). I have tried setting memory for
the address range 177700-177777 and I can set/reset values everywhere
I've tried. Preset clears overflow, and hitting IBL (with S as 001100)
sets it, so it looks like the microcode does run. Nothing changes in
memory. Hmm.. I take that back, I think that 177777 may change and
nothing else. I'll have to try again tonight.
--
Tim Riker - http://Rikers.org/ - TimR at Debian.org
Embedded Linux Technologist - http://eLinux.org/
BZFlag maintainer - http://BZFlag.org/ - for fun!
Any pointers
on why IBL won't work on my HP-2108A ? :)
Bad ROM? I presume you've tried storing values into the last 64 locations
in memory via the front panel to confirm that writing memory works. You
might try a scope on the ROM outputs to see if they move when you press the
IBL button.