Well today I got my NeXT Dimension board fully functional
with 32MB of RAM installed. Unfortunately the RAM came out of my
slab. I am asking this here due to the number of SIMMs I am now in
need of. If anyone has the following and would like to sell them,
please let me know.
16 - 4MB 30pin SIMMs, 100ns or better, parity or non-parity
(as long as they all match), low profile preferred. These are to
replace the 1MB SIMMs currently in my Cube's '040 mainboard.
8 - 4MB 72pin SIMMs, 80ns or better, 1M x 32 or 1M x 36 (as
long as they all match). These are for my slab to replace the SIMMs
I pulled for use in the Dimension board.
Thanks
Jeff
--
Home of the TRS-80 Model 2000 FAQ File
http://www.cchaven.comhttp://www.geocities.com/siliconvalley/lakes/6757
On Jan 14, 14:26, Ethan Dicks wrote:
>
> --- Richard Erlacher <edick(a)idcomm.com> wrote:
> > I do believe the main reason for the 68010's appearance in what was
> > previously a number of 68000 applications was that it could support
> > virtual memory, while that was awkward on a 68K.
>
> That's my recollection as well.
There are two relevant differences. The first is that on the 68000 (and
68008), reading the system byte in the status register isn't privileged, so
MOVESR works in user mode as well as supervisor mode. In the 68010, that
was corrected and an extra opcode was added to allow reading the user byte
(condition codes) in user mode. The second difference is that the 68010
has the VBR (vector base register) so different interrupt/trap vectors can
be used in different modes; the vector base is fixed in the 68000/68008.
There's no difference in things like address range, modes, MMU
interfacing, etc. Those changes came with the 68020.
The other changes were improvement to the microcode, which made loops
faster.
--
Pete Peter Turnbull
Network Manager
University of York
Hi all,
We have an HP 9892A card reader which appears in decent shape. We would
like to interface it to a PC if possible.
It is a rebadged Documation M600.
Anyone have docs or info about this model and its interface?
Regards,
-- hbp
On January 14, Christopher Smith wrote:
> > I know that some model of UNIX PC had room for a full-height MFM drive
> > under a hump (most only had room for a half-height). It was
> > too little,
> > too late, but you could drop a lot more than 40Mb inside - maybe 80Mb
> > or more! :-)
>
> IIRC, that was the second UnixPC model that was never released. (7400?) It was also supposed to have a color screen. That said, I suppose it wouldn't be difficult to run the drive interface cable through a plate in the back of the machine, if you can find a plate that will fit it, and has a hole for a connector that you can run to an external drive chassis.
Umm, no, that was the 3B1. It was most definitely released, as I've
had several of them. I used to run Seagate ST4096 80MB drives in them.
I'd kill for one with a color display though. :)
> On the other hand, there are MFM to SCSI bridges, I believe, and I wonder whether you could just use one of those and run some 1GB or so disk on it.
Those bridges typically go the other way, to put MFM drives on a
SCSI bus. I'd imagine it'd be pretty difficult to build one to go in
the other direction.
-Dave
--
Dave McGuire
St. Petersburg, FL "Less talk. More synthohol." --Lt. Worf
On Jan 14, 15:52, Rob Kapteyn wrote:
> I have not yet tried this yet --
> In theory, electrolytics can be re-formed.
> There is a very thin aluminum oxide layer that disappears after a long
time.
> Running current through the cap will rebuild the insulating layer until
current will no longer go through it.
>
> I want to reform the original capacitors in my Altair "in place" -- i.e.,
without unsoldering them.
>
> I have the following setup in mind:
>
> 1. Insulate the computer from the world -- unplug it and put it on a
rubber table.
> 2. Use ultra mini test clips to connect to both leads of a capacitor.
> 3. Connect the test leads to one of those lab power supplies that have
adjustable DC voltage and a milli-ammeter.
> 4. Connect + on the lab power supply to + on the capacitor (very
important).
> 5. Start at zero voltage and increase slowly while looking at the
ammeter.
> 6. Stop increasing the voltage when the ammeter reads anything more than
a few milliamps.
> (If it draws too much current, the capacitor will heat up and may
blow up)
> 7. Wait for the current on the ammeter to drop to zero.
> 8. Continue to increase the voltage, and wait for the ammeter to drop
until you reach the rated voltage limit of the capacitor.
> 9. Repeat for every electrolytic cap in the computer.
>
> Has anyone done this ?
> Will it work ?
I've not done that in-circuit, but it might work. There are some gotchas.
If you're talking about power smoothing caps, any voltage you put on the
cap will also be powering the rest of the circuit. Disconnect any
transformer. You don't want to feed them DC. Also, the current drawn by
the rest of the circuit will make it impossible to gauge the leakage
current in the capacitor.
If you're talking about any other capacitor, putting a voltage on it may
provide power to some signal line connected to an unpowered device, which
the device may not like. In particular, TTL doesn't like power on some
signal inputs when there is a ground connection but no Vcc.
In either case, the voltage rating on the capacitor is likely higher than
the maximum for the logic ICs, and TTL in particular does not like
excessive voltage (NMOS is more tolerant). Don't exceed the lowest
maximum-voltage rating of any device on the board.
Of course, you're assuming that the capacitors need reformed. They might
not (but it's good practice to assume they might). If you can't remove
them without risking damage to the PCB, I would try feeding power into the
board through a current-limited supply at a low voltage and gradually
winding it up to the normal value over a period of several tens of minutes.
If they've completely dried out, they're dead anyway. Stop if the current
shoots up, or seems too high -- you probably have a short. Is an Altair
board like a typical S100 board, fed from an 8VDC unregulated supply, and
with on-board regulator? If so, just use a bench supply as above.
--
Pete Peter Turnbull
Network Manager
University of York
On January 14, Ethan Dicks wrote:
> > used the 68010 even though they had rather limited HDD
> > resources. It would have worked better with two drives, methinks.
>
> I know that some model of UNIX PC had room for a full-height MFM drive
> under a hump (most only had room for a half-height). It was too little,
> too late, but you could drop a lot more than 40Mb inside - maybe 80Mb
> or more! :-)
If memory serves, the one with the half-height bay was called the
7300, and the full-height version was the 3B1. They were the same
otherwise; I swapped a few out from damaged machines many years ago.
They sure were great machines. I wouldn't mind having one for
posterity.
-Dave
--
Dave McGuire
St. Petersburg, FL "Less talk. More synthohol." --Lt. Worf
> On Mon, 14 Jan 2002, Douglas Quebbeman wrote:
>
> > > But A/UX sucks humongous hairy sweaty donkey balls.
> >
> > has anyone every noticed that *nothing* ever sucks
> > tiny little dainty hairless donkey balls?
>
> I bet tiny little dainty hairless donkeys do...
Don't they call those "gerbils"?
<ducking>
;)
Finally -- a nice haul in my area.
BUT I WAS ON VACATION !!!!
Is any of this still available ?
It ALL looks interesting to me.
I am in Chicago and I have a truck, and a lot of storage space (with loading dock).
-Rob
-----Original Message-----
From: Jon Auringer [SMTP:auringer@tds.net]
Sent: Tuesday, January 08, 2002 6:53 AM
To: Classic Computer Mailing List
Subject: VAX 11/780s - Masscomp - Valid equipment available
Hello all,
Along with the Astronautics ZS-1 machines I posted about earlier, we
have some other equipment available. I have someone interested in one of
the 11/780 machines and possible others. As with the ZS-1 machines, the
time frame isn't very long. Again, we are closing this facility and the
equipment will be scrapped if not rescued.
1 DEC 11/780 (3 wide cabinet) currently up and running 4.2 BSD
3rd cabinet has a Ven-tel plugin modem rack w/~10 modems
1 rack containing 4 Fujitsu Eagle drives (one drive is off-line due
to increasing errors)
1 Fujitsu 9-track tape drive in 2 wide cabinet (not quite as tall as the
VAX cabinet)(This is a nice auto loading drive, there is a second
one available with two drives from a non-VAX system)
1 DEC TE16 9-track tape drive (1 wide cabinet)
1 Fujitsu line printer
1 DECWRITER III printing terminal as console
1 DEC 11/780 (3 wide cabinet) currently down but was running fine
when turned off (VMS)
3 DEC RP07 drives (each the size of a washing machine on steroids!)
1 DEC TU78 9-track tape drive
1 Scicards design station (This is a dedicated color graphics
terminal used for printed circuit board (PCB) layout)
I am told the tube was a little on the fuzzy side.
1 Benson photo plotter (we used this exclusively to print out PCB
artwork for checking)
1 Dataproducts line printer
1 DECWRITER III printing terminal as console
3 Valid Systems m68k based Multibus systems. Each system has several
dedicated mono graphics cards to drive multiple design stations.
Each system is in a half-height rack which contains the Multibus
rack, an 8" Fujitsu fixed disk drive and the slot loading 9-track
tape drive. I am unsure of the status of these systems. I believe
they were running when shut down, but I have doubts about the drives.
6 or more of the Valid Scaldstation design stations. Each includes a
table with built-in digitizer and a 19" green monochrome graphics
monitor. These systems were used primarily for schematic capture,
but ran a full blown UNIX, so I always enjoyed reading news on the
"big screen". :)
1 Masscomp m68k based system
This system is also Multibus based and resides in a pair of 5' high
racks. One rack contains the multibus chassis and a pair of Fujitsu
drives. The second rack houses the 9-track tape drive and a third
8" Fujitsu drive. This machine was only lightly used when I signed
on in 1989, and shut down shortly thereafter. I have gotten it up
and running RTU on its ST-506 boot drive, but haven't managed to
get the Fujitsus online.
7 Masscomp MC-500 deskside chassis
These are also Multibus based m68k systems. These run the same OS as
systems above. They have an internal 5-1/4" floppy and ST-506 fixed
drive. There are a bunch of the monochrome graphics tubes that go
along with these units. Actually, it appears like each chassis is
designed to drive a pair of the graphics terminals. I have one of
these boxes that I did a clean install of the RTU OS. The other 6
are in varying states of repair. I think there are enough bits to
assemble at least 3 more complete systems.
2 DEC MicroVax II in a 19"
There is also a rack mounted chassis with a pair of SMD drives.
Each of the MVII has a SMD controller card. Both of the boot drives
are dead and I don't have a way to format replacements. I would
like to hang on to these if I can manage to get them home without
doing myself harm.
1 Tek 4014-1 graphics terminal w/hard copy unit. The terminal works
fine, but I haven't had a chance to test the hard copy unit. I would
like to hang on to this unit, but moving it is definately a two person
and a truck kind of thing. So I may have to let it go. :(
? StorageTek 9-Track drives. 110V operation. How many of these I have
depends on the fate of the ZS-1 machines. I have a couple now, and
will have several more if the ZS machines are scrapped.
Large quantities of documentation. Over a dozen UNIX programmers
manuals in metal desktop racks. Complete documentation sets for VMS,
gray and orange binders. I have a box with complete unopened
docs for a later version (don't remember off-hand which version) of
VMS than we had ever installed. Documentation for several revisions
of SunOS4. If I were to walk through the building, I could easily
double this list. Basically we have just about everything!
Thanks for listening,
Jon
Jon Auringer
auringer(a)tds.net
On Jan 14, 19:16, Tony Duell wrote:
> Read that as 2SB1243 -- which is not in 'Towers International Transistor
> Selector'.
No, but it's in my Japanese transistor book (I can't tell you the proper
title because it's in Japanese :-))
Yes, it's a PNP power trannie, in an ATV package, which is a bit like a
TO220 but without the metal tab. It has a beveled edge on the front top,
instead of a metal tab on the back.
Vcbo -60V
Vceo -50V
Ic(max) -3A
Pc 1W
Icbo -10microA
Vcb -40V
hFE min 56 max 390 at Vce=-3V Ic -0.5A
Vce(sat) -1V
Vbe(sat) -1.5V
Ft 100MHz
Pin order is ECB (opposite of the common TO220).
Near equivalent 2SD1864.
> I am pretty sure 2SB numbers are 'power' PNP transistors. In which case
> I'd expect the emitter to go to a +ve supply line and the collector to go
> to the printhead pin. If it's a TO220 package, then it's a good bet the
> pinout is :
>
>
> -------------
> | | |------------- emitter
> | O | |------------- collector
> | | |------------- base
> -------------
--
Pete Peter Turnbull
Network Manager
University of York
