I have 2 different loopback? plugs... both made by T-BAR
565-980-2 is DB25M with wiring (on the visible circuit side):
2-3
4-5
6-20
8-23
11-15
12-21
14-16
565-980-3 is DB25F with wiring (on the visible circuit side):
13-19-22
17-24
There are traces on the top of the PCB as well, but the DB25
connector is covering them, so they'd have to be discovered via
a multimeter....
I haven't found any t-bar information by those #s on line....
And they don't match a few different RS232 loopback plug
wiring diagrams I found online...
Anyone have a clue what these are ?
Thanks,
-- Curt
pcoghlan+cctech at vms.eurokom.ie (ORCPT pcoghlan+2Bcctech at vms.eurokom.ie); Thu,
Reply-to: "General Discussion: On-Topic Posts Only" <cctech at classiccmp.org>
>
>> I have an AlphaServer 1000A 4/266 that is not booting. When I power it up,
>> nothing shows up on the control panel LCD and there are no beep codes. I
>> know that the motherboard is receiving power because the "link active" light
>> on the Ethernet adapter comes on. Is there anything that I can do to fix it,
>> or should I just try to find another Alpha (I don't seem to have much luck
>> with Alphas - I have a DEC 3000/300X with a bad RAM slot).
>>
>
>
>There's every chance the LCD is hosed, do you get anything out of a console
>connection? From what I remember the A1000A doesn't beep on successful POST,
>first machine to do that was the DS20.
>
My AlphaServer 1000A 5/333 and 5/400 both beep during or after the POST.
>
>The strange thing is that it was sitting for a few months, and it worked
>fine the previous time I turned it on.
>
I also have a number of DEC machines that failed after sitting for a few
months. I posted about them around the time of the "Leaving computers on..."
thread about a month ago but I never saw my mail make it to the list for
some reason.
>
>Does the floppy drive light come on? I'm wondering if the SROM has gone bad
>and it needs a Failsafe Load, but I guess before that point you should at
>least get the POST displaying on the LCD. Do the PSU fans start up? I'm not
>near a 1000A till tomorrow so I won't mention reseating the CPU module until
>I know it has a removeable one :)
>
The CPU module is removable and I have had trouble with one of my machines
fixed by reseating it. However, the symptoms were different - there was
activity on the display and there were beeps giving error codes.
I have also had a problem with a failed Bcache on the CPU module (it seems
this can be a weak point on the AS1000A) and I had memory failures. However,
neither stopped the POST displaying on the LCD nor the graphics console from
working.
I would suggest reseating the CPU module and removing any PCI cards present.
(I have an Alphaserver 800 which became a complete brick while a combination
of PCI cards were present that it didn't like.) If there are any EISA cards
present, I would leave them in place because there may be issues with the
config utility that has to be run when the EISA bus configuration is
modified. Other than that, I suggest trying the system with just the bare
essentials present and seeing what happens.
It would be useful to know if the fans start. Fan problems on some alphas
cause the whole thing to shut down. Also, there is an interlock microswitch
to prevent power up when the cover is open. This is probably not the problem
here though as the symptoms are as if the front panel power switch is off.
Regards,
Peter Coghlan.
>
> Date: Mon, 26 Apr 2010 22:17:22 +0100
> From: "Andrew Burton" <aliensrcooluk at yahoo.co.uk>
>
> ----- Original Message -----
> From: "Tony Duell" <ard at p850ug1.demon.co.uk>
> To: <cctalk at classiccmp.org>
> Sent: Sunday, April 25, 2010 6:23 PM
> Subject: Re: Looking for an Apple /// keytop
>
>
>> >
>> > I'm looking for the 6 keytop from the numeric keypad for an Apple ///.
>> > I've already replaced the broken-off keyswitch, but, of course the
>> > keytop is long gone.
>>
>> On a related subject, has anyone managed to make their own keycaps
>> either
>> by using ah ome-made injection moulding machine (I've seen a couple of
>> books on this, and the average keycap is small enough to be made that
>> way) or using one of htose rapid prototyping machines ('3D printers')?
>>
>> -tony
>
> Or how about a way to replace key labels? The bottom right leg of the 'K'
> on
> my laptop is half gone. Other letters are also being worn away in places.
> Sure I could use plain old white labels and write (or print) letters on
> them, but it would look very tacky :(
Are the Apple III keycaps at all similar to the IIe keycaps? I have a
bunch of new Apple IIe Platinum (extended) keyboards in the attic. If
it's useful to you we can work something out off list.
I thought I could use the key switches (from the IIe) on Mac Plus
keyboards, but they're a little too different. Still, it's tempting to
rig up a micro to take the IIe input and convert it to the Plus protocol,
but really, when would I get far enough through the project queue to do
that?
Jeff Walther
Saw this mentioned on Slashdot a minute ago and thought of you guys:
"Cory Doctorow tells us that '[i]n 2007, John Goerzen scraped every
gopher site he could find (gopher was a menu-driven text-only precursor
to the Web; I got my first online gig programming gopher sites). He
saved 780,000 documents, totalling 40GB. Today, most of this is offline,
so he's making the entire archive available as a .torrent file; the
compressed data is only 15GB. Wanna host the entire history of a medium?
Here's your chance!' Get yourself a piece of pre-Internet history
(torrent)."
<http://tech.slashdot.org/article.pl?sid=10/04/29/2141254>
<http://www.complete.org/~jgoerzen/Full%20Gopher%20Archive%20from%202007.tor…>
Figured someone (or several someones) around here might be interested in
this... :)
Cheers,
--
Phil.
classiccmp at philpem.me.uk
http://www.philpem.me.uk/
Andrew Warkentin wrote: "I know that the motherboard is receiving power because the "link
active" light on the Ethernet adapter comes on."
I hate to tell you but the ethernet boards led's come on anytime a cable is plugged in that is connected to other related equipment - a hub, switch, or another computer via a "null-modem" cable. It does that even with the power cord unplugged.
Do you have any of the manuals for the 1000A? I have manuals for the Alphaserver 1000A if they might help.
Good luck!
Awhile back, there was a question about refurbishing worn plated card
edge connector contacts. I thought I'd post a link to an outfit that
sells plating pens for just such an application:
http://www.hunterproducts.com/
--Chuck
>
> Date: Thu, 29 Apr 2010 04:15:28 -0700 (PDT)
> From: Mr Ian Primus <ian_primus at yahoo.com>
>> I thought I could use the key switches (from the IIe) on
>> Mac Plus keyboards, but they're a little too different.
>
> Actually, you can... Many years ago, the first original Macintosh that I
> owned had several dead keys. I replaced the faulty keyswitches with ones
> from a junked IIe keyboard. The only difference was the pin spacing - I
> simply drilled holes in the circuit board to allow the pins from the IIe
> keyswitch to pass through, then soldered jumper wires back to the proper
> traces.
Ah, good to know. Thank you!
Jeff Walther
