>Anyone tried this snake oil^H^H^H^H^H^H^H^Hamazing substance?
Quantum tunnelling eh? No comment :)
FWIW, I am still a big fan of LPS-1, I've used it for years to clean &
restore some of the most inconsolable antique potentiometers & switches. I
would think that a greaseless lubricant of that type would be very happy on
computer connectors..
As for erasers, I'm assuming that red pencil erasers are out due to their
slight abrasive characteristics? what about the 'kneaded' erasers that
chalk / conti artists use? (I'm not talking about Artgum )
Please let me know if this is bad thinking...
Bill
PS Thanks to everyone for posting the wealth of MDS background - I now feel
like it was worth my time to drag this behemoth home. Hey, anything with a
bank of switches & lights has got to be OK, right?
-----Original Message-----
Mega thanks, that makes some sense looking at the board.
I'd suspected something like that. Te ability to start on any
4k boundary is nice. The 74138 on one side and the '20 on
the other should have screamed at me.
Allison
>The 16 pin DIP socket has a "black box" plugged into it. Hmm, popping
>that box open reveals the expected jumpers.
>
>Looking down at the jumpers, the upper left corner is pin 1, upper right
>is pin 16, I have 4 wires installed:
>
> pin 5 - pin 14
> pin 6 - pin 13
> pin 7 - pin 12
> pin 8 - pin 11
>
>My board is set to cover fields 4 - 7.
>
>My guess would be that the 3 EMA bits are decoded into 8 lines, and are
>present on pins 1 - 8, corresponding to DEC field terminology 0 - 7,
>which makes obvious sense since pins 1 - 8 are on one side of the
>DIP jumper, and that pins 11 - 14 are the individual 4Kx12 field
>select jumpers.
>
>-Lawrence LeMay
It aint no VCF, but the last MIT Flea of the year
is this Sunday! (IBM 5100 last seen: 1992, $200.00)
http://web.mit.edu/w1mx/www/swapfest.html
John A.
(Didn't buy it. Fool!)
From: Phil Budne <phil(a)ultimate.com>
>> Has anyone designed a quick-n-dirty Qbus IDE adapter?
>
>see ftp://digital.dp.ua/DEC/ata/
Knew someone would look. ;)
> ATA disk interface
See above.
> BOOT EPROM or Flash
MRV11 with what you need in eprom or MXV11
M8189 11/23 takes eproms on the cpu.
> Crystal CS8900 Ethernet
DELQA
> 512KW SRAM
MS11 memoriesare out there.
> SuperIO (ie; WinBond)
> or
> NS16550A (or eqiv high-speed, deep FIFO) UART for networking/kermit
> Floppy ctrlr (capable of driving Shugart 8", 5.25" 3")
Well the 16550 is basically a DZV-11, DHV11, that will get you a
bunch of lines good to 38kb
FDC for the mix if 3.5 or 5.25 is RQDX3, late rom.
5.25 is rx50(400k) and rx33(1.2m)
3.5 is rx23(1.44m) and rx24(720k)
8" is RX02/RX12. 256k/512k with 256k standard sssd 8"
media and formatting.
> ISA Bridge
Why bother.
Now if you wanted that all on a 8x9" board then I'd perk up my years.
Allison
From: Eric Smith <eric(a)brouhaha.com>
>The originally shipped a single-density FDC for 8-inch drives. It used
>some NEC single-density only FDC chip that was *NOT* related in any way
>to the uPD765 or the Intel 8271 or 8272. I don't recall the part
number,
>but it was almost certainly uPD and three digits.
The uPD372... I have two of them.
Allison
From: Joe <rigdonj(a)intellistar.net>
>>400ft, 10mhz clock for a S100 z80 system that was also distributed to
>>other boards on the bus. A modification to the termination of that
line
>>virtually made it disappear, the standard terminators didn't actually
>>match the impedence of the line making it antenna. Other hot one
>>was the Altair you could hear the 2mhz anywhere in the house
>>with the case on.
>
> Was that being ratiated via the AC power lines or the keyboard cable
or
>what?
>
> Joe
The altair just radiates.... All the jungle wire fromthe FP to bus.
There was no attempt to provide ground planes or decent grounding.
None of the systems I mentioned would have a "keyboard cable".
Allison
From: Ethan Dicks <ethan_dicks(a)yahoo.com>
>Has anyone designed a quick-n-dirty Qbus IDE adapter? If one is willing
>to let the VAX processor do the work, it could be as simple as mapping
>the I/O registers of the IDE drive into some I/O addresses. Not much
>more than a few Qbus drivers and an address comparator, a la older ISA
>IDE cards. It would probably heavily tax most CPUs, though.
Some Russin person did. it's out on the net somewhere.
As to taxing the older CPUs... How? IDE can do real slow, that's
not much of an issue. Most of the VAX cpus do not handle
interrupts very fast due to the huge overhead of context switch.
But they can PIO in a loop fairly fast, that is to the limits
of Qbus.
Allison
Allison
Hello Everyone,
I seem to be in possesion of a "broke" TF86 drive. As far as I can tell the
only thing "wrong" with it is that it seems to have unhooked its "tongue"
(the take up leader) and I've fixed that. Now I was wondering if there were
any tests I could run on it before I tried putting it into a chassis to see
what it does :-). It has a separate "bridge board" that converts its HD50
connector to DSSI.
Some things I'm trying to ascertain:
1) Can I convert it to a TZ86 using the bridgeboard from a TK85? (they at
least share connector similarity.
2) Is there any way to test it without hooking it to a DSSI bus?
3) Does anyone know the MOLEX part number for the 5 space DSSI
power plug?
--Chuck
> Hi
> I also find it interesting to see the following app note:
>
> http://www.stabilant.com/appnt32h.htm
>
> I have never seen the problem they are talking about and
> I have a sea going sail boat. According to their note,
> this should be the worst condition. Makes me wonder
> what I might be doing that is different than what
> they are doing?
Are you cleaning periodically with the silicone? Perhaps
you're cleaning it often enough to prevent the silicate
>from forming...
-dq
From: Bill Pechter <pechter(a)pechter.dyndns.org>
>The real fun on VMS is how slick EDT is with a good VT100/220.
>
If you think EDT is slick... try TPU or LSE after that Word will be
intolerable.
Allison