All,?
I have a Compaq Portable ("luggable"), revived from damp storage, and I'm trying to work through some of the troubles it has.
First one I'm trying to sort involves the video card. It has the original CGA card in, with the internal output hooked to the internal screen. It has a DB-9 connector for an external C/EGA screen and also NTSC composite output on an RCA plug.
I've not been able to test the external 9-pin because I don't have a screen, but I'm going to guess it's working because the internal screen display is good.
The composite out is terrible. On several television sets it jumps, losing horizontal sync. The image supposed to be on screen is legible, just.
Anyone have experience with this issue (a particular cap, a chip particularly prone to failure) or the schematics for the board? It's tough to trace, being a 3 layer sandwich.
If anyone has the schematic for the vdu driver board also, I need to work on that too, it's suffering from dry capacitors.
Thanks
Phil Andrews
Sent from my Samsung Galaxy S?4
Hi,
Anyone have a Data Translation DT2766 manual? It's a qbus 4 channel DAC
card.
I googled everything I could think of and can't find a thing. I could
use a pdf (or the real thing, which ever works). I'd be happy to scan a
physical copy and return it.
thanks!
-brad
I see all sorts of stuff for collecting/trading around here, but not a lot of IBM equipment.
Anyone do much hobbying of IBM stuff, especially S/360, S/370, and S/390?
Anyone know where I could find some interesting artifacts, like a 1052? Or other similar-vintage stuff?
Thanks in advance!
-Ben
I have a gent needs old Mac LCII, 1994 or older, complete and working with
color monitor, kbd, mouse, etc.
They also use Mac SE and other old Macs. If you have some available for
sale, please contact me.
Needed in Atlanta, GA area. Need to NOT be discolored.
Cindy Croxton
Electronics Plus
1613 Water Street
Kerrville, TX 78028
(830)792-3400 phone (830)792-3404 fax
AOL IM elcpls
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I was working as a VMS administrator up until 2 years ago.? The healthcare business still has some VMS systems in use today.? The one I took care of ran the GE software for a well known physicians group in San Francisco.? We called it IDX but it had been through many names as GE tried to make it seem modern.? Based on one of the MUMPS variants.? A horrible mess that was susceptible to unexplained problems at any moment.? Very expensive to run since GE charged a lot for support and it needed a lot of it.??? Two years ago, the whole IT departement got outsourced and the overseas staff, India, was supposed to take over.? After a couple months of that I quit in disgust.? I do know one guy still doing VMS at an HMO in Sacramento.? That'll go on for a couple more years.? My Alpha XP900 is sitting unused in my garage.
> Message: 13
> Date: Tue, 22 Oct 2013 08:28:55 -0400
> From: Brad Parker <brad at heeltoe.com>
> To: cctalk at classiccmp.org
> Subject: Data Translation DT2766 manual?
> Message-ID: <52666F87.7050403 at heeltoe.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> Hi,
> Anyone have a Data Translation DT2766 manual?? It's a
> qbus 4 channel DAC
> card.
> I googled everything I could think of and can't find a
> thing.? I could
> use a pdf (or the real thing, which ever works).? I'd
> be happy to scan a
> physical copy and return it.
> thanks!
> -brad
While you wait for proper info... apologies if you've already considered and rejected this, or if it's a
silly idea...
Were you after software or hardware info or both? Either way...
I don't know the DT2766 itself, but I found a DT2766 picture that looked like 4 simple D2As on a card.
Based on that, and on what I remember from a few decades ago, have you looked around for DEC
documentation on the AAV11C? There ought to be some in various realtime-related documents which
with luck would be available on Bitsavers and elsewhere, but I couldn't quickly find anything useful just
now.
The AAV11C was a simple PIO dual height Qbus 4channel DAC card (and before it, there was the
AAV11A quad height card).
If you're lucky you *might* get a pleasant surprise from the AAV11C. Or it might be completely different
>from a DT2766, in which case, apologies.
My hardcopy of DEC's 1985 Microcomputer Products Handbook has five pages on the AAV11C in
chapter 33, covering addressing, configuration, but not connector pinout. Chapter 33 references the
LSI11 Analog System Users Guide, an AAV11C Field Maintenance Print Set, and the AAV11 Diagnostic
Documentation Kit. Manx says the Analog System Users Guide isn't online, didn't check the others..
There was also an AAV11D which really was a rather different beast, with upmarket features like DMA.
Best of luck
John Wallace