"Zane H. Healy" <healyzh at aracnet.com> wrote:
> It sounds like you have the audio only A/V modules. This is what I have
> in both of my SGI O2's. :^(
Hmm, the video connectors and all the major components are in place, and the board has the number 030-0728-004 on it - Gerhard Lenerz's SGIstuff page says this is an O2 Audio/Video Board (Audio only module would be 030-1145-XXX).
Hinv however only detects the board as "Audio: A3 version 1" so the video circuitry must have been disabled somehow. Perhaps there's something to be done about it: There are a few open resistor lands next to the edge connector (R503, R504, R505; R510, R511, R513, R514) and along the lower edge of the board (R556, R557, R558; R569, R573, R575, R576; R587, R593) and three SMD inductors (L512, L513, L514) missing on the solder side.
So long,
Arno Kletzander
--
Arno Kletzander
Student Assistant // Studentische Hilfskraft
Informatik Sammlung Erlangen
www.iser.uni-erlangen.de
Der GMX SmartSurfer hilft bis zu 70% Ihrer Onlinekosten zu sparen!
Ideal f?r Modem und ISDN: http://www.gmx.net/de/go/smartsurfer
Does anyone know when seven segment displays first appeared on the scene?
Presumably the first ones were VF, and LED came later?
(I was just looking at a museum's mock-up of the Apollo mission control
console, and the fake readout is made to look like a 7-seg display; I'm just
surprised that the digital readouts weren't all Nixie-based back then)
cheers
Jules
I have an identical item. I need a 720kb floppy LIF formatted floppy disk, mine is shot. If you would care to make a copy of the HP 1651A OS on your machine I would be glad to pay for it. For now I'm dead in the water. I have tried to create a OS disk but I have LOTS of gaps in my machine language understanding. Also any help in this direction would be GREATLY appreciated.
Best Regards,
Chris Wolters
It used to be you could go to Radio Shack and pick up a couple of 74ls02
chips as needed. Now it seems there isn?t a source for someone who wants to
purchase a handful of 74xx ttl chips. I have a ?brand new? s100 SIO card
that is just missing the 14 logic chips to go in the sockets, but I am not
finding a convenient source for them.
Anyone know where I can go to find them in very small quantities?
Jeff Erwin
I recently bought another HP Integral on E-bay, and after the normal
cleanup on the floppy drive it works fine. The expansion slots both
cotnained boards, one was a 512K RAM board, the other an RS232 oard
(which is the main reason I watned this machine!).
Anyway, the RAM board was clearly identical to the 1M board, just with
only have the RAM chips fitted and the links set differently. Having got
a lot of 41256 chips on old PC memory boards, I spent the afternoon
upgrading it to 1M.
BAsically :
1) Remove the bracket and cover from the PCB (torx screws)
2) Clean out the holes fro the RAM and their decoupling capacitors using
a soldering iron and solder sucker. Test the board at this point, if it
doesn't work, find the solder bridge between traces in the RAM area...
3) Fit 16 off 16 pin turned-pin sockets to the RAM space. Test again
4) Fit 16 off 0.1uF capacitors. I found the exact part at Farnell.
They've been discontinued (They're not lead-free...) but they still had
stock. Test again
5) Plug in the RAMs and test again
6) Removce the link 'W2' on the board (this is the bank select line to
the RAM controller), link the end that's common with W1 and W3 to +5V
(e.g. the end of the decoupling capacitor right next to that point). Test
again. You're now using the new RAM chips only, as a 512K oard.
7) If it works, set all the links as for a 1M board, trst again
8) Finally put the cover and bracket back on.
Now for the curiousity. One one of the standard disks supplied with the
Inegral is a program called 'status'. And one of the things it displays
is the amount of free memory.
In my machine, wioth no RAM boards fitted. there's 264K free. With the
512K board, it reports 764K free. And with the 1M board, 1264K free.
My question is what's happening to the other 12K of each half-meg? Or
deos 'status' have an odd definition of a kilobyte?
-tony
>DigiKey or Unicorn Electronics.
>Both want $25 on the order or a handling fee applies.
>Grant
>At 09:03 AM 2/29/2008, you wrote:
>It used to be you could go to Radio Shack and pick up a couple of
74ls02
>chips as needed. Now it seems there isn?t a source for someone who
wants to
>purchase a handful of 74xx ttl chips. I have a ?brand new? s100 SIO
card
>that is just missing the 14 logic chips to go in the sockets, but I am
not
>finding a convenient source for them.
>
>Anyone know where I can go to find them in very small quantities?
>
>Jeff Erwin
The Digikey "Handling fee" used to be $5 . . .
If you're buying 14 TTL's, you may already be at the $25 minimum. . .
I don't usually start with Digikey, though.
Try checking out MOUSER . . . MCM electronics, or JAMECO.
All can be reached at their .com websites. . .
(Jameco still has NOS 4164's and 41256's and decent prices.)
T
> Date: Sat, 1 Mar 2008 00:06:39 +0000 (GMT)
> From: ard at p850ug1.demon.co.uk (Tony Duell)
> Subject: Re:
> To: cctalk at classiccmp.org
> Message-ID: <m1JVFFS-000J3jC at p850ug1>
> Content-Type: text/plain
>
> > I/O - but I have to say I was extremely impressed by the upgrade -
> > almost exciting reading!
>
> I assume thats saracsm. It's a very simple upgrade -- it was
> obvious what
> the extra chipos should be, it was also obvious what most of
> the links
> did. And I do have a 'factory' 1M board in my other Integral
> (although I
> could have worked it out without that).
>
Tony:
No sarcasm intended - what's simple to you is an adventure to others.
For me it was a very educational read - and if it was really that
simple, you wouldn't need to post the steps, would you? Thanks for the
tour!
-W
Yeah, same here; the trouble is that a lot of things that I deemed
uninteresting and tossed out in the past turned out after the fact to be
very interesting indeed for some other folks, as I discovered when I joined
this list. And despite the general disdain for newer stuff and especially
PC stuff, in 20 years that may also be interesting; now I don't dare
throw anything out.
Anyway, looks like they've found a new home and I hope that any
interesting ones will be scanned & made available on the Web.
Coincidentally and related to another recent thread on here, the first
brochure I happened to pick up was from Techtran, who had a line of
standalone and rack-mount RS-232 cassette and diskette units
(Interacters); turns out I even have the remnants of one of their
units in my junk pile.
Think I'll keep the Russian (Cyrillic) Cromemco brochure though...
mike
******************************************************************************
Date: Sat, 01 Mar 2008 08:35:11 -0800
From: Marvin Johnston <marvin at west.net>
Subject: Re: Sales brochures, price lists etc.
That is the same problem I have/had. I extablished a cutoff date recycled
anything I didn't consider interesting after that. The sales brochures I
generally kept, but for other stuff, I just put a cutoff date of sometime in the
early 1980s for anything I considered common or not interesting.
> From: M H Stein <dm561 at torfree.net>
>
> Time to finally clean out some file cabinets; what should I do with
> sales brochures, price lists, etc. from the 80s? Nothing exciting,
> not very informative, but hate to just toss 'em into the recycle bin.
>
> m
>
>Subject: Re: Q-bus to CF [was: IOmega]
> From: woodelf <bfranchuk at jetnet.ab.ca>
> Date: Sat, 01 Mar 2008 10:58:34 -0700
> To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org>
>
>der Mouse wrote:
>>>> Some time back (years), someone was working on an IDE interface for
>>>> a Qbus MicroVAX and I was doing the driver. [...]
>>
>>>> We never got it working, and it is not clear to me, now, why not.
>>>> [...] what memory I have indicates that there were hardware issues,
>>
>>> the likely reason is PDP-11 and VAX does read before write and IDE
>>> does not like that.
>>
>> Huh? The only sense I can think of in which the PDP-1 and VAX could be
>> said to do read before write is in the bus transaction sense, and
>> anything that could be called "IDE" was insulated from bus
FYI in the bus transaction sense is what counts as the device in this
case the IDE disks sees that. The fix is simple isolate reads and
writes. When I say bus I'm talking physical hardware interface not
the "software" interface or other hardware abstactions.
In the VAX case the Qbus or Ubus behaves the same as PDP11 even if
the read is thrown away.
>> transactions. While the card didn't have much smarts, it did have that
>> much; it looked enough like a wdc that I did the driver as an "attach
>> wdc at uba with wdc_uba" attachment layer, rather than a completely new
>> driver. I find I still have my copy of the dev directory, including a
>> boot-time console log:
Doesnt need smarts. It only has to look like an SL! you have a series
of about 8 registers, some read, some write and some are read/write
for example the data register. Any incidental reads or writes to the
data register during a transfer is unexpected and messes with the
IDE (DISK) internal smarts. So the logic has to make that bunch or
registers look like distinct read and write addresses that do not
overlap. Thats why the serial line interfaces for U and Q buses
need 4 addresses, Control write, Data write, Status read and Data read.
>Well if my SBC6120 ( PDP 8 Clone) can have a IDE interface
>why not some other PDP. We are not looking for high speed
>just hardware in this case.
Right, however it has to be done right or it doesn't work. Bob
understands that designed accordingly.
The read before write problem is important to status and data registers
becuase if you touch them at the wrong time (like an incidental read
when you mena to write) the devices internal logic is slightly messed up.
The fix and even DEC does things for DL devices (and others) is that
the write is gated to one set of addresses and the read is to another.
Adds a little logic but nothing complex.
Allison
That is the same problem I have/had. I extablished a cutoff date recycled
anything I didn't consider interesting after that. The sales brochures I
generally kept, but for other stuff, I just put a cutoff date of sometime in the
early 1980s for anything I considered common or not interesting.
> From: M H Stein <dm561 at torfree.net>
>
> Time to finally clean out some file cabinets; what should I do with
> sales brochures, price lists, etc. from the 80s? Nothing exciting,
> not very informative, but hate to just toss 'em into the recycle bin.
>
> m
