I have not even begun to look at the drive yet but I thought I would float
the problem here in case someone has actually had something happen as weird
as this.
PROBLEM: Both drives don't work.. only "Write Protect". Is you tip either
drive on it's left side they work fine, (blower starts up, lights,
everything..). [not the right side]
Looks to be PSU problem but I have not popped the top yet.
In all the years I have worked on RK05s I have never seen this!
john
PDP-8 and other rare mini computers
http://www.pdp8.com
I've finally gotten one of my PDP-8/Ls back on its feet - the solution:
remove *all* the cards, hose down the backplane with contact cleaner and
clean each and every finger of each and every card. The hit-and-miss stuff
just wasn't cutting it, nor was alcohol. I don't know what's in the contact
cleaner, but I have a small case of it I aquired from a now-defunct Commodore
Dealer here in town (there are *no* ingredients on the label, nor any
references to MSDS sheets, so it must be old).
As a bonus, I set up a tripod and an 8mm camcorder and took 1 second shots
between each card insertion. I now have a 1.75 minute time-lapse movie of
the cards popping in, one by one. What I _don't_ have is a way to digitize
the movie. :-(
When all was done, I fired up the machine and it ran the following program
the first time:
0020 7604 LSW / Clear accumulator and OR in the Switch REgister
0021 5020 JMP 0020 / Do it again
Core is fine, power fail/restart is fine, all the front panel switches appear
to be fine. This machine hasn't worked right for *years*. A good stiff
cleaning is all it took. Now, on to TTY tests and eventually, MAINDECs.
One gotcha with this box - one of the fuse holders is loose at the back of
the PSU. In its untightened state, it produces an open circuit if I move
the box around and don't wiggle it back to its groove. I may need to remove
most of the cards to remove the PSU to get to the nut. <sigh>.
One down, two to go.
-ethan
=====
Infinet has been sold. The domain is going away in February.
Please send all replies to
erd(a)iname.com
__________________________________________________
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Subject: Hewlett Packard A2094 Monitor (Standard RGB ?)
I found a Website with the specs on the HP monitor I found.
Could someone take at look at the specs and tell me if this is standard RGB
,
or is it possibly VGA compatible ?
Monitor Specifications: (From the Website)
Screen Attributes
19" Aperture grill
" viewable image
.30 mm dot pitch
Input Signal
Video Signal : Analog
H Frequency : 68.7
V Frequency : 75 Hz
Sync Signal : Green, Composite, Separate
Input Connector
5 BNC
Maximum Resolution
Maximum : 1152x870, 75 Hz
Macintosh : 1152x870, 75 Hz
Flicker free :
User Controls
Analog controls
BR, CT, CV, VE
Plug and Play
I finally dug out my OMNIBUS LA-180 interface card - M8365, pcb p/n 5011818B.
I don't know much about it except that I used a 40-pin cable straight to the
parallel input connector on the LA-180, and that whateve IOTs it uses must be
the "standard" line printer ones because it took no fiddling with. I plugged
it in and OS/8 was happy with it. No muss, no fuss.
-ethan
=====
Infinet has been sold. The domain is going away in February.
Please send all replies to
erd(a)iname.com
__________________________________________________
Do You Yahoo!?
Thousands of Stores. Millions of Products. All in one place.
Yahoo! Shopping: http://shopping.yahoo.com
--- John B <dylanb(a)sympatico.ca> wrote:
> I hope someone can answer these questions...
>
> Where does the 16 pin front panel connector plug into the main options board
> and which way? (There are two sockets on the Options board)
It doesn't. It plugs into a 16-pin header/ribbon cable that comes from the
backplane. The two empty sockets are for user boot roms.
> Where does the main serial line plug into (which port on which board)?
The DKC8AA (I don't have the handle number here) - it has two Berg connectors
facing front (for the full front panel) and three facing backwards - the
one closest to the edge fingers is the serial connector. The other two,
for the sake of completeness, are 12-bits in and out. The output port can
be used to drive an LA-180, but the data is inverted from normal and the IOTs
are not the same. With a recompiled driver, however, you could drive a
parallel printer with it.
Do you need a copy of the 1977-1978 microcomputer handbook? I have a spare.
Let's talk.
-ethan
=====
Infinet has been sold. The domain is going away in February.
Please send all replies to
erd(a)iname.com
__________________________________________________
Do You Yahoo!?
Thousands of Stores. Millions of Products. All in one place.
Yahoo! Shopping: http://shopping.yahoo.com
Friday evening I tried to send a message to CLASSICCMP, and was informed
that since I was not a subscriber, I couldn't. Now I subscribed back before
the first VCF, so it must have been over two years ago. After several
exchanges with "listproc(a)u.washington.edu," I was informed that I was
subscribed, and am now getting TWO of each message.
Not wanting to tackle that automated system again, I am sending this
message in hope that a human being can straighten things out.
Regards
Charlie Fox
Charles E. Fox
Chas E. Fox Video Productions
793 Argyle Rd. Windsor N8Y 3J8 Ont. Canada
email foxvideo(a)wincom.net Homepage http://www.wincom.net/foxvideo
I hope someone can answer these questions...
Where does the 16 pin front panel connector plug into the main options board
and which way? (There are two sockets on the Options board)
Where does the main serial line plug into (which port on which board)?
john
PDP-8 and other rare mini computers
http://www.pdp8.com
-----Original Message-----
From: Jim Strickland <jim(a)calico.litterbox.com>
To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
Date: Saturday, December 11, 1999 4:32 PM
Subject: Re: Apple ][ + but no Floppies
>> Appletalk for the IIgs? I didn't know. Was there ever Appletalk for
older
>> machines (it would have to be under ProDOS, of course)?
>
>Yup. AppleIIGS had appletalk built in. I've used it to print. It's slow
>but it works. There were also appletalk cards for the 2e's.
>
>
>
>--
>Jim Strickland
>jim(a)DIESPAMMERSCUMcalico.litterbox.com
>-----------------------------------------------------------------------
> BeOS Powered!
>-----------------------------------------------------------------------
>
--- "Charles P. Hobbs" <transit(a)primenet.com> wrote:
>
> You still need those Apple II DOS system disks? I can make them now. . .
I'm not the original requester, but I have several Apple II systems and no
*original* system floppies, just a couple of boxes of bootable stuff from
the place I used to write kiddie games at (c. 1984).
Given that I do kinda have a working system, is there a way to send Apple II
disk images like you can with a Mac? Back in the bad old days, we used to
transfer stuff to/from the Apple with a faux-serial cable out of the game
port (bit banged TTL to the bit banged TTL port on a C-64, to be precise).
I do have an Apple IIc+ that has both 5.25" and 3.5" diskettes, if that
helps.
Thanks,
-ethan
=====
Infinet has been sold. The domain is going away in February.
Please send all replies to
erd(a)iname.com
__________________________________________________
Do You Yahoo!?
Thousands of Stores. Millions of Products. All in one place.
Yahoo! Shopping: http://shopping.yahoo.com
I just got a copy of eBay Magazine in the mail today. What a scary thing
to have a magazine on. Of course now I'm starting to wonder what kind of
list I'm on, that's the second magazine I've gotten in the last couple
weeks that I've no idea why I got it.
What's really scary is they've got 2-3 pages that are a 'barometer' of how
stuff on eBay is doing. The good news is that as far as I can tell,
classic computers aren't listed.
Zane
| Zane H. Healy | UNIX Systems Adminstrator |
| healyzh(a)aracnet.com (primary) | Linux Enthusiast |
| healyzh(a)holonet.net (alternate) | Classic Computer Collector |
+----------------------------------+----------------------------+
| Empire of the Petal Throne and Traveller Role Playing, |
| and Zane's Computer Museum. |
| http://www.aracnet.com/~healyzh/ |
