I have a heap of floppy disks on hand. Most with old junk on them. Some are
going bad, and have bad spots in the middle of the disk. Is there a good
utility for either windows or dos that can format a floppy and mark the bad
parts of the floppy to not be used?
If anything, such a utility can let me find what disks are having issues
and i can pitch them before i run into the aggravation of finding there is
an issue with a disk down the line.
--Devin
Is there a part number on the nvram? The chips Sun used with the enbedded
battery were a standard part available from Mouser. Or is there a visible
battery on the board anywhere?
>> I guess it will require getting ahold of a backplane, and seeing what
>> I can find out with an ohm-meter.
> It looks like I'll still have to do this at some point, to confirm my
> theories about how the two busses are wired on the backplane
> (separation of UB and EUB address lines, and cross-connection of the
> data lines, for the EUB/SPC slots)
I have checked an -11/24 backplane, and the wiring is indeed as I
hypothesized (above).
> Another mystery: The "PDP-11 UNIBUS Processor Handbook" (1985) says
> (pg. 4-10) that in the 5.25" box, "only one MS11-P memory module can be
> configured". Anyone know the cause/source of that restriction?
> ...
> I can't come up with any technical rationale for that limit? Am I
> missing something? Or is it just DEC marketing, trying to limit how
> powerful the machine can be?
I would still be grateful for any insight from anyone about this.
Noel
Hi again...
My recent adventures with the StorageTek tape unit is on hold since I
got a whole new computer to play with... (and because the disk on my
linux with SCSI card had gone bad). A NORD-1 by Norsk Data AS (or Norsk
Dataelektronikk AS as the company was called in those days). It is a
computer built from TTL chips, a whopping 2250 of them. I seems to be in
great shape and I even have drawings of the most of the CPU.
More about it here : http://www.ndwiki.org/wiki/NORD-1_Serial_47 ...
with pictures. :-)
The NORD-1 was designed in 1967, the first one was sold in 1969 and
somewhere between 60 and 120 were produced until it was succeeded by the
NORD-10. A few NORD-1 ended up in Cern.
The power supplies all was within 0,05V from nominal, not bad for a 44
year old computer. And except from a few broken switches, a shorted
capacitor (mechanical damage) and a few missing cards it is in "running
condition". Well, liberally used definition, it sort of runs. I can set
the address register and inspect the different registers. When put in
continuous mode the program counter runs through and loops the memory.
My guess so far is that there is a problem with reading and writing to
the memory. The problem is that I have no documentation over the memory
module except a drawing of the circuitry used to access it. ND bought
several different models of core memory for it's early computers and
just adapted the interface.
So once again I turn to the cctech for help, does anybody have
instructions about ExpandaCore 18 from by Cambridge Memories INC,
Newton, Massachusetts (also known as CMI but probably not the CMI on
bitsavers).
So far the only thing I've found was a newsflash in a computer magazine
about a sale of memories to another computer maker.
My plan is to have this machine up and running within a year, in time
for the 50 year anniversary of ND founding. :-)
... and this is a long shot, if anyone has a copy of ND-NEWS (ND-NYTT in
Norwegian) I would like to have a scan of it. There might be an article
in it about delivering this machine to the school that I got it from.
Thanks in advance, G?ran
Hi
A rather large Unisys memory board came up for sale locally. The seller
doesn't know much about it and I'm curious which machine it comes from.
Here are some picture, fairly low resolution I'm afraid: http://www.pdp8.se/slask/unisys_mem/
Do you know what it might be?
Thanks,
Pontus.
Hello Paul,
hope you are fine now.
I'm interested too to Pro380 boards, because I have a machine with
almost no expansion.
I'm trying to contact you since weeks, sent some emails but never
received an acknowledgement.
Maybe there are problems with spam-killers?
Please check your email and let me know if you didn't receive anything.
Thanks
Andrea
Ahhh, thanks Ray. I still need to replace several bulbs of my NOVA3 console.
Somebody knows of a source for 28V 40 mA ?grain? bulbs with wires?
I could use some 10 ? and 20 as spare ?
BTW, I read somewhere that the bulb to LED replacement is not as
straight-forward as you may think. The small continuous current through
the bulbs (to prevent thermal shock) is enough to make LEDs appear
continuous on!
- Henk.
Van: Bruce Ray<mailto:Bruce at Wild-Hare.com>
Verzonden: vrijdag 22 juli 2016 20:16
Aan: General Discussion: On-Topic and Off-Topic Posts<mailto:cctalk at classiccmp.org>
Onderwerp: Re: Nova 3 front panel
DG generally used 28V, 0.040 Ma (nominal), fragile wire-lead
incandescent bulbs for the Nova/SuperNova/Nova2/Nova3 front panels as
well as the early Eclipses. The S/130 was DG's first LED-based front
panel and was much-appreciated by Field Service.
More followup off-list...
Bruce
On 7/21/2016 10:53 PM, jim stephens wrote:
> Is there anyone with documents on the Nova 3 front panel, and what
> drives it? It has some number of custom DG chips, which hopefully are
> good if I want to try to fire it up to play, but am interested in that
> on good authority there are 28v incandescent lamps.
>
> A friend has an Eclipse front panel with nearly identical bezel, which
> has LED's and a number of differences in the logic (different connector
> to the system, for instance). So it is probably all run on 5v.
>
> I have not had time to figure out the driver circuit for any of the
> lamps to see what that may turn up, and wanted to know whether it was
> 28v lamps before I buy 40 of them. (the thing has only 2 out of a lot
> of lamps).
>
> Thanks
> Jim
Was cleaning out some stuff and ran across some HP drive sleds I don?t need.
HP Model A3647A made for 4.3GB HVD 3.5? SCA 7200 RPM drives.
I have 4 of them and all the screws that were inside holding the drives.
Any interest?
---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus
I've got an old amiga 2000, that I have stuffed a GVP G-Force 030
accelerator into.
Does any one have, or know a source for the 1mb or 4mb 64pin GVP Simms?
Thanks
I've been asked to refer a customer to someone with a 20MB 8" Bernoulli
setup. There are only 2 disks involved and absolutely nothing is known
of the provenance. I can put you in contact and you can name your terms
to do the work.
Note that a sector-by-sector image of the disks might be useful as it's
unknown if these are PC or Apple format.
Contact me off-list if interested. US only, please.
Thanks,
Chuck
