I just realized that my reply to Jerome's inquiry about the
LSI-11 module with five chips was probably wrong. IIRC, the
LSI-11 chip set consists of the control chip, data chip, and
two MICROMs for the base instruction set. The EIS/FIS (KEV11)
is a single additional MICROM. So the original quad-height
LSI-11 module would have four 40-pin chips without the EIS/FIS,
or five with.
Was it the LSI-11/2 half-height module that sometimes used
a hybrid with two MICROMs? If so, it was probably the two
microms that implemented the standard instruction set, in
order to leave a socket open for the KEV11.
On the 11/23 and 11/24, some of the chips were also on dual-chip
hybrids.
Eric
[ I can't seem to reach the nameservers for vintage.org, but this ]
[ could just be me since no one else's complaining... ]
I don't care where it is on the East Coast, though the closer to
Boston the more likely I am to exhibit my few paltry items. Suddenly
much more likely thanks to the acquisition of an older Honda
Passport SUV...
This'd be an incentive to get the VAX-11/730 running again. That'd
make a nice, compact display if I don't kill myself trying to move
it. Or if I could squeeze more than 2MB in along with a UDA50 and
tape controller... I know, I know, it isn't as interesting as the
pdp-11/40, but all I have of that is the front panel with some TTL
that uses the address bit LEDs as a binary counter. (And no, I did
_not_ butcher the machine, I found it that way.)
Hey, if I also finish cobbling together my pdp-11/73 in a BA123 box
I can show how much faster _and_ lighter it is than the 730... >^)
--Steve.
> It's kind of an odd thing, but does anyone have a Symmetric 375
> box that they want to pass to a good home.
Well, a while ago I was soliciting ns32k hardware of all sorts and
while the Symmetric was mentioned as an example, no one was offering
a unit for sale, trade, or otherwise. I don't recall anyone having
production numbers, but "few" seems appropriate...
Darned shame, it's a very fine looking box. I'd love to have one, as
I'm sure would at least a few others.
--Steve.
PS - Thanks to all who responded to that earlier thread, esp. David
Fellows and Al Kossow.
I'm trying to help some guys outfit TI-99/4As with 360K
drives. A year or so ago, they were still available from
some of the surplus dealers I know about, but they seem
to have disappeared.
Does anyone have a line on supplies of 360K drives? The
only ones I find via web search are $25, which seems a
bit much for a once-ubiquitous drive that is now a little
obsolete.
Mark -
Saw your note on classiccmp.org re the Dynalogic Hyperion. I have several of these machines as well as some diagrams and parts lists for them. Two of them have a problem in their video circuits such that their screens show nothing nor is there a signal out of the external monitor RCA plug, yet the computer will otherwise continue to function normally. I have been looking for some guidance on how to track the fault down and fix it but have so far had no success. Any thoughts?
Regards
Leo Butzel
lbutzel(a)attbi.com
Seattle, WA
Steve;
I have a bunch of older Tektronix Probes from when I was buying surplus from
Tek. Contact me offline at whoagiii(a)aol.com. It will help if you let me know
what you are looking for.
I would have replied directly but your reply was cctalk.
Hope this helps,
Paxton
Astoria, Oregon
If you're one of those people who wants a PDP-8 but can't find one, don't
despair - you can always build your own! The SBC6120 is a complete PDP-8
built around the venerable Harris HM6120 CPU and modern programmable logic
devices. All parts used except the 6120 are contemporary, easily available
devices.
The entire system fits on a PC board 6.2" by 4.2" and has approximately the
same footprint as a 3.5" hard disk. The SBC6120 has an IDE disk interface,
an optional 2Mb non-volatile RAM disk (that's as big as an RK05!), and a true
KL8/E compatible console terminal interface. OS/8 device handlers are
available for the IDE and RAM disks, and the system will run standard
OS/8 V3D. There's even an expansion bus so you can design and build your
own daughter cards to plug into it.
To find out more, visit the SBC6120 web page at
http://www.SpareTimeGizmos.com/Hardware/SBC6120-2.htm
I've recently had two requests to buy SBC6120 PC boards. These are four
layer boards with plated holes and are quite expensive in quantity one or two,
but the price falls per piece falls dramatically for quantities as small as
four or six. I'd like to find a few other people who would be interested in
building their own SBC6120 and going in together on a PCB order. The price
for a SBC6120 PC board would be something like:
Two boards ==> $100 per board
Four " ==> $60 per board
Six " ==> $45 per board
Ten " ==> $36 per board
I also have about four spare 6120 chips, which I'm willing to sell at my
cost of $50 each. Believe it or not, it is still possible to buy new old
stock 6120s, at $50 each, with a minimum order of ten (!!), but if enough
people want SBC6120s we could always go this route.
If you're interested, please write to me at bob(a)jfcl.com.
Bob Armstrong
I'm looking for the model name/number and date of introduction of the
first IBM ThinkPad, also the date of introduction of the CDI Miniterm
(those cute thermal printer terminals with acoustic coupler on the back).
Many thanks for any help,
-- hbp
