14 Jul
2007
14 Jul
'07
7:25 p.m.
On Saturday 14 July 2007 14:51, William Maddox wrote:
--- Lyle Bickley <lbickley at bickleywest.com>
wrote:
I used a fair number of "pulls" from another/different MODCOMP which had been
previously "updated" with new chips.
I also obtained chips from friends and sources that for privacy reasons I will
not mention. In some cases, I literally ran folks out of some series of "H"
chips. I also bought some chips in quantity (lots of 25 or more per type). By
the time I complete restoring I/O, I'll probably only have a few left as
spares.
Of course, I could have resorted to substituting "S" for "H" - they
are a lot
easier to come by - but I wanted to restore the MODCOMP II as one would an
artifact.
2) Obtain all the chips you'll need up front
from
your "stash" and buying as
required. Bag or box them in numeric order near the
system. In my case, I
needed to acquire a lot of chips - as I had very few
74H and 74S series in
stock - and the "fast" MODCOMP II needed scads of
them.
Hi, Lyle. Do you have a good source of mixed-lot or
small quantity 74H series parts? I've picked up a few
odd lots, but to get any selection, it looks like you
have to go to the legacy chip merchants who have large
line-item minimum orders. Congratulations on getting the Modcomp restored.
As for the guy who asked about "but will it run
Linux?", I doubt it, but I get you could get v6 or
v7 to run on it. ;)
I don't think MODCOMP II was ever capable of running any *NIX. It only
supports 64KW (128KB) of memory - and has no memory mapping. However, I do
plan to run MODCOMPs MAX OS on the II.
You have an I/O box. Does it
have a disk controller for the Diablo 30?
I don't have a Diablo - only a paper tape reader, floppy disk interface,
console (RS-232) and High Speed Serial interface - and a "customer" created
interface that looks like some kind of analog data sampling device.
My next project is getting all the peripherals to work (with the exception of
the "customer" interface (I'm still searching the source archives for any
information on it).
Lyle
--
Lyle Bickley
Bickley Consulting West Inc.
Mountain View, CA
http://bickleywest.com
"Black holes are where God is dividing by zero"