I am working on an HP9836C, in particular the colour monitor part.
The original problem looked to be slight misconvergence, with red
fringes. But I think it wasn't really convergence problems at all. I've
been looking at the video amplifier PCB (the one at the back of the CRT)
which not suprisingly contaisn 3 identical video amplifiers along with a
blanking amplifier and components to pass the correct voltages to the CRT
electrodes.
Anyway, there's a resistor in each of the amplifiers that according to
the colour bands should be 12.4k. In the green channel it's close --
12.7k. In the blue channel it's nearer 17k, and in the red it's
open-circuit. And I think this could be messing up the HF response of the
red amplifer, hence the fringes.
The problem is that if I replace it, I'll have to set what HP call
'colour alignment' and what I grew up calling 'grey scale tracking'. I've
read the offical HP procedure (if you're interested it's pages 134-138 of
the pdf service manual on http://www.hpmuseum.net/), and there are at
least 2 problems
The first is that I don't have a suitable photometer. The second is that
even though it claims I need this photometer for the gain adjustment, the
cutoff adjustments are done to 'barely extiguish the raster' I've worked
on enough monitors to know that that's not precise at all, so I am
wonderign just how accurte the photometer _really_ needs to be.
Has anyone ever done this setup and can offer any tips?
-tony
This isn't my auction, and I don't know the seller. This thing
is totally over the top, however, for lots of screens and buttons.
Looks like the helmsman's station for a starship. It's in
Mineapolis, and, as of this writing, its $9.99 with no bids.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=170268552316
Aesthedes computer system vintage - eBay (item 170268552316 end time Oct-09-08 10:38:33 PDT)
All,
Out of the shadows to say, I need to sell/trade/other my Apple ][* gear.
I've detailed some of the Apple ][* items at
http://www.applefritter.com/node/23531
I'm also interested in hearing which items may be more valuable and
worth putting up on ebay (be that as it is).
If you have any interest or comments, contact me off-list.
Thanks,
Scott
us21090 at yahoo.com
-------Original Message:
Date: Tue, 07 Oct 2008 08:21:56 -0500
From: "Robert J. Stevens" <trebor72 at execpc.com>
Subject: CROMEMCO Systems & ZPU
I have a Cromemco ZPU I need to qualify. I also have a lot of Cromemco
Floppies. If I could get the ZPU Working then I might be able to set
up a Cromemco HD System. There is a lot of source on those floppies. I
posted them for making copies. I just was able to look at all of them using my
Compu-Pro 8-16 system booted up to CP/M 2.2. Is there anyone out there
still running CROMEMCO's. Got a bunch of CDOS Floppies as well [they
are also posted to make copies available]
There is a wealth of Stuff here that should be wasted. Need to get
them copied and saved somewhere. Job is to big for me right now.
Bob in Wisconsin
--------Reply:
Well, I've got several Cromemcos running here, but I'm not sure exactly
what you want; copy disks, check the ZPU, and/or??
mike
--------Original Message:
Date: Tue, 7 Oct 2008 07:57:22 -0700 (PDT)
From: Mr Ian Primus <ian_primus at yahoo.com>
Subject: Looking for some used floppy media
I'm in need of some blank floppies...
I need 8" soft sector disks for my TRS-80 Model II, I'm building an adapter cable to hook an 8" drive to a PC so I can write system disks for it. I've also got a Model 16 that's begging to get revived.
I could also use some more 5 1/4" DSDD disks - I'm beginning to run low. A while back I had rescued a very large box of used disks from a school basement - and it turns out that they must have gotten damp at some point in their past life. Many of them have that "disk fungus", and won't format. I thought I was set for disks, and hadn't sought more out in years.
I am primarily looking for used disks, I know that I used to run across large boxes of used 5 1/4" disks pretty regularly, but that was a few years ago.
Thanks!
-Ian
-----------Reply:
Well, I've got some boxes of each, but I like to get $10+S/dozen for the 8".
I'm sure others on here will have some free or cheaper; just thought I'd mention
it though, JIC.
mike
I revived my Servo-8 Z80 SBC (single board computer)
for the NJ VCF (Vintage Computer Fest).
Is anyone still running any, or have notes/materials?
Anyone still running Z80 Ampro Littleboards?
Circuit Cellar SB-180 ?
-- Jeff Jonas
jeff_jonas at att.net
Hi,
I've got several HP 264x terminals. These terminals expose a card
edge connector off the back of the terminal to which you attach an
RS-232 serial cable.
Before I go to the trouble of making one of these,
I wondered if anyone had one to spare?
Thanks!
--
"The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download
<http://www.xmission.com/~legalize/book/download/index.html>
Legalize Adulthood! <http://blogs.xmission.com/legalize/>
I checked vt100.net/manx and manuals are listed there but are not
online and I couldn't find anything on bitsavers.
Does anyone have information on this? I just know its an X terminal.
Digging around on the net implies that this is a diskless VAX 3100
model 30. How does it get its X server loaded at boot up?
--
"The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download
<http://www.xmission.com/~legalize/book/download/index.html>
Legalize Adulthood! <http://blogs.xmission.com/legalize/>
I have this drive sitting here, and no particular use for it. I'd started
talking about it to a list member some time back, but that never went
anywhere. A label on one side says "DFL413C04A" and "Alps Electric Co.
Ltd.", the drive has no faceplace on the front, and on the rear is a single
keyed edge connector and no separate power connector.
Anybody want to take this off my hands? I have no use for it.
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, a critter that can
be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
I'm in need of some blank floppies...
I need 8" soft sector disks for my TRS-80 Model II, I'm building an adapter cable to hook an 8" drive to a PC so I can write system disks for it. I've also got a Model 16 that's begging to get revived.
I could also use some more 5 1/4" DSDD disks - I'm beginning to run low. A while back I had rescued a very large box of used disks from a school basement - and it turns out that they must have gotten damp at some point in their past life. Many of them have that "disk fungus", and won't format. I thought I was set for disks, and hadn't sought more out in years.
I am primarily looking for used disks, I know that I used to run across large boxes of used 5 1/4" disks pretty regularly, but that was a few years ago.
Thanks!
-Ian
