On Sun, 30 Oct 2005 22:41:27 +0000 (GMT), rd at p850ug1.demon.co.uk
(Tony Duell) wrote:
> I am working on an HP59405, which is the HPIB interface for the HP9830
> 'calculator'. On the PCB are 2 chips which cross to something
> called an
> MC1806. This is not in any of my Motorola databooks.
> Does anyone have a databook that lists it?
This is the short description:
Part Number = MC1806P
Description = 2-Input AND-Function Logic Gate
Manufacturer = Motorola
Circuits Per Package = 4
t(PLH) Maximum (S) = 35n
P(D) Max.(W) Power Dissipation = 75m
Vsup Nom.(V) Supply Voltage = 5.0
Status = Discontinued
Package = TO-116
Pins = 14
Military = N
Technology = DTL
The attached PDF is a overall listing of the Motorola DTL. Hope this
seems like you could use one of Avery's small labels and put a rectangular piece of foil on part of the sticky side. You should be able to "cover" the slot and have a label that stays in place.
From: Brian Wheeler <bdwheele at indiana.edu>
Sent: Nov 1, 2005 2:23 PM
To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
Subject: Re: Good source for write-protect/enable tabs
Its not pretty, but I've used electrical tape in the past.
On Tue, 2005-11-01 at 10:35 -0800, Chuck Guzis wrote:
> I used to have a big stockpile of write enable/protect stickon tabs for
> diskettes but it's gradually getting whittled down to a precious few dozen.
> Does anyone have any suggestions on where more can be obtained? Note that
> these have to be the removable opaque BLACK tabs. (I've got a bunch of 3M
> clear red tabs that don't work at all on some drives.)
The VIA C3 based motherboards (usually in a mini-ITX
form factor) certainly meet the "low-power" part of the
needs. An EPIA 800 (C3 @ 800MHz, about the same computing
power as the Pentium III you've currently got, more if you stay
away from FP operations!) and modern IDE
hard drive tick along at about 25-30W power consumption.
A small RAID array of IDE drives will bring the power consumption
up a few notches (add about 10-15W peak for each additional
There are rack-mount mini-ITX systems available, see for
My EPIA 800 webserver hosting about two dozen virtual
domains (most but not all of them classic computing related)
has survived a couple of slashdottings in the past 3 years
without breaking a sweat :-).
I finally got juice on the main power line connection in my museum.
I am connecting my machines bit by bit, after 2 years of inactivity.
I have found the following problem with my 11/34C.
(I will keep the description short, and tell only the end result)
The console of the 11/34C (11/34A plus cache option) shows weird
(=wrong) behaviour. It was working fine!
The display shows "000000", and the RUN LED is off.
If I press the 'LSR' button, the 'SR DISP' LED goes on. However,
if I press any of the numerical buttons, '1-6', a digit in the
display only flashes very brief. I cannot say what the digit was.
It looks like the M7859 has developed a problem.
To make things more weird the following happens if I start with
pressing the 'CLR' button and then the numerical buttons.
1) press CLR (display stays at "000000")
2) press e.g. 6 (some of the rightmost digit segments briefly flash)
3) press 6 again (1st and 2nd of the right display flashes)
4) press 6 again (1st, 2nd and 3rd of the right display flashes)
The first leftmost three displays remain "000" and do not show any
sign of changes. Pressing 6 after the first 3 times, repeats the
flashing of some segments in the three rightmost displays.
So, I have the impression it has the problem to do with the M7958.
AFAIK, the entry of the digits, for example the numeric entry '165020'
does *not* need the UNIBUS, but only sets up an internal register.
The 'LAD' button, and 'DIS AD' will start a UNIBUS cycle (to access
a memory location). Correct?
BTW, the voltage on the CPU backplane (DD11-PK) is 5.08 V. and the
+15 and -15 read +/-15.x V. (Can't remember the exact value).
I have an other 11/34 with an M7958, but never powered up that box.
I took that M7859 and installed it in the 11/34C. The display stays
dark. According to the M7859 doc, that basically means that the board
is dead. So much for board swapping. Sorry, could not resist to
try an easy success. I don't have other spare M7859 ...
If you are interested, I can tell the steps I did before I stumbled
on this M7859 (?) problem ...
Anybody seen this display / console panel behaviour on the 11/34 ?
Any clues ? All input is appreciated !
- Henk, PA8PDP.
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I don't recognize the equipment, but it looks like a variac in the last
piece of equipment that is probably worth saving if you plan on pitching
> See http://www.ezwind.net/jwest/whatsit
> Should I pitch this stuff? Anyone know what it is?
>Subject: RE: Big dollars paid for Altair 8800 on Ebay
> From: "Chuck Guzis" <cclist at sydex.com>
> Date: Mon, 31 Oct 2005 15:31:35 -0800
> To: cctalk at classiccmp.org
>On 10/31/2005 at 5:06 PM Gil Carrick wrote:
>>SWTP being a Texas company they would go well in our museum. What are you
>Gil, I'm not a collector. Just finding someone with a SWTP TVT that
>they're trying to get operational would be sufficient. I also have the
>assembly instructions and schematics.
>I've long since discarded the (very heavily modified) main board. One of
>the first changes I recall doing was modifying it to display 16 lines of 64
>characters and recognize a few more control characters. Interestingly,
>that last was mostly done with diodes and pullups instead of TTL gates.
>Shortly after that, I graduated to a Beehive Super Bee terminal.
>The serial board has an NE555 installed on it with a small trimpot as a
>baud rate generator. IIRC, 7497's were pretty hard to come by back then.
>I think I've got a taker, for the cards, BTW. Just need to get them into a
>small Priority Mail box and off to the PO.
>>> Speaking of old stuff, when looking for something else, I ran
>>> across the serial and RAM cards for the SWTP TV
>>> Typewriter--are they worth anything or are they better used
>>> as landfill material?
Not landfill fur sure.
I acutally have a working TVT and most of it's docs with same mods you did
save for mine was interfaced as parallel to the Altair.
Works ok with a modern LCD TV!
Debee is depending on me to get this PDP-11 working for VCF this weekend
(she's speaking on Sunday!). I've got a 11/73 with 2.11BSD. The hardware
configuration is pretty typical - RQDX3, DEQNA, TK50, and one DZQ11.
Everything runs fine, but I need to install a second DZQ. The first DZQ has
csr 160100 and vector 300, so according to my calculations the second should
be at 160110 and vector 310. I set the switches, install the card, and then
edit my system configuration to change NDZ to be 2, rebuild the kernel,
reboot, and, .... Disappointment!
When it gets up to init, it says:
init: configure system
dz 0 csr 160100 vector 300 attached
ra 0 .... 172150 .... 154
tms 0 .... 174500 ... 260
... etc ...
nothing about the second DZQ. Everything else still works, including the
original DZQ11, and it boots up just fine except that there's no sign of the
I figured I made a mistake building the kernel, so I double check my
kernel configuration and yes, the file dz.h contains "#define NDZ 2". Just
to be safe I delete all the objects from my machine's configuration
directory and rebuild the entire kernel from sources (takes a couple of
hours on a 11/73!). Still no joy - init only finds one DZ... And I'm sure
I'm booting the new kernel because of the timestamp it prints out when you
At this point I figured it's a hardware problem. Just to be sure, I
pulled out both DZQs and swapped the switch settings on the two cards. This
makes the original DZQ card now the "second" one at 160110/310 and the new
card the "first" DZQ at 160100/300. Put it all back together and boot it up
again - same results! Init finds the first DZ but not the second! Moreover,
all the serial ports on the back that are now connected to dz0 (which is the
card that used to be the second dz) still work! Of course, the ports on dz
1 (which is the card that used to work) are now dead. It seems like the two
DZQ11 cards must be OK.
Oh, and BTW, I even used the 11/73's console ODT to verify that all
addresses from 17760100 to 17760117 respond.
The only explanation I'm left with is a configuration problem. Is there
something I don't know about rebuilding the 2.11bsd kernel? Is 160110/310
the wrong location for the second DZQ11?
Thanks much, any suggestions are appreciated.