The Curator of the Computing Collection at the (UK) Science Museum is
coming down to see it in May to see my second ICT1301 to give me a
provisional decision on whether they want to take it. If they don't,
I have found someone as mad as me, who would like to buy it, but he
want me to give him a price. My question is, how much is it worth? I
don't want to ask too much but I don't want to find something similar
is sold a couple of months later for ten times as much. I have two
bracketing values, that I bought it for 150 GBP in 1977, and that it
was sold new for 247,000 GBP in 1962, both figures plus inflation of
course. That is a somewhat wide range, and must be reduced by the
fact it is not assembled and will probably need many months work to
get it into working condition, but even as a static display it is
quite impressive. Does anyone know of any experts who could come down
and value such an unusual thing? Probably none have been sold since I
bought mine so it would have to be based on other brands or models.
Roger Holmes
At Wed, 5 Mar 2008 14:00:29 -0800 (PST), Herbert C. Williams wrote:
> But...
> Logic levels are different when using PNP transistors. IBM in its
> SMS series
> cards used "S" levels (+S and -S) which were -12 and 0volts. Commonly
> germanium transistors were PNP, and the Vcc rail was a negative
> voltage (in the
> case of SMS cards -12 volts). If you have a logic analyzer, you
> can TRY to use
> it by connecting the ground level reference to -12 volts and hope that
> something doesn't blow because the analyzer's ground is now at -12
> volts and
> logic levels go "up" from there.
My old Biomation K100 will take a +/- 50 volt signal and set
reference levels to -6.4 to +6.35 volts. This should be sufficient to
handle most logic levels out there. However, the newer logic
analyzers typically restrict the reference levels to +/- 5V at best.
Re-referencing ground still requires one to be able to set the
reference level, which in the case of the cited logic probably
requires +6 V.
[...]
CRC
> Date: Sun, 2 Mar 2008 12:09:29 -0500 (EST)
> From: Steven Hirsch <snhirsch at gmail.com>
> On Sun, 2 Mar 2008, Doc Shipley wrote:
>
>> At the risk of sounding like a broken record, MC Howard in Austin,
>> Texas
>> has been my source for everything from 74-series chips to 64-pin
>> wirewrap
>> The prices on their website are insane, but I've never heard of them
>> actually charging what's listed.
>
> Interesting. If I tripped over that website on my own, I wouldn't have
> the impression that it was worth my while to deal with them. Literally
> everything brings up a page stating "...Coming Soon".
And if you're ever in Austin, it's worth a stop by to browse the store.
It's not huge, but it's fairly large and there are many shelves of Stuff.
They also have a nice assortment of old connectors.
Take Loop 1 (AKA MoPac) to 183. Go south on 183 to Burnet Road. Take
Burnet Road north two stop lights to Longhorn. Turn left on Longhorn,
take it to the end (a few blocks) turn left again, and Howard is in the
second set of industrial buildings on the left, next to the carpeting
distributer.
Jeff Walther
I recently acquired a Western Peripherals TC130
controller set. Does anybody have any expeience with
this controller and would I be better off getting a
single board solution. I have a Cipher 1734 drive I
would like to use.
Thanks,
Brian.
> Do you have any more information on this? Is it an official
> document or something done to make a processor similar to a
> 6502? I'd like to find the guy who did it. If he had the
> CAD file then we could make a gerber.
I think it has been created from the information on this site ..
http://impulzus.sch.bme.hu/6502/
Lee.
My friends in CompSci at York have reminded me that the School of
Computer Science at the University of Manchester is organising a number
of activities "to celebrate the 60th birthday of computing"" -- that is,
to celebrate the 60th birthday of the "Baby" computer. There's to be a
computer animation festival and a public open day in June that may be of
interest to UK list members, and there's a "program the Baby" competition.
Details at http://www.cs.manchester.ac.uk/Digital60/
--
Pete Peter Turnbull
Network Manager
University of York
Don't know if this made it first time; if dupe, pls excuse.
-----Original Message:
Date: Thu, 06 Mar 2008 07:54:50 -0800
From: Bob Rosenbloom <bobalan at sbcglobal.net>
Subject: Re: Obsolete chips
dwight elvey wrote:
> Hi
> Here is a list of the DTL that Anchor has. Does anyone have
> a pinouts and types for these??
>
>
> 930
> 932
> 934
> 936
> 937
> 946
> 948
> 951
> 958
> 962
> 1800
> 9093
> 9034
> 9099
>
> Knowing what these are would help in knowing what other DTL
> numbers are the same part.
> Dwight
>
I have data sheets for the following:
930 = expandable dual 4-input NAND
932 = expandable dual 4-input buffer
934 = hex inverter
936 = hex inverter
937 = hex inverter
946 = quad inverter
948 = clocked flip-flop
951 = multivibrator
962 = quad 2-input NAND gate plus inverter
Bob
---------Reply:
Hmm, I have slightly different info:
946 = Quad 2-input NAND
962 = Triple 3-input NAND
On the other hand I can't find a 934 listed in my books...
In addition:
958 = Quad 2-input power gate
1800 = Dual 5-input NAND
9093 = Dual J-K
9034 - S/B 9094 = Dual J-K
9099 = Dual J-K
Also listed at Anchor:
935 = Hex Inverter (extendable)
949 = Quad 2-input NAND
Equivalent devices usually differ in the value of the pullup resistor
(if any):
e.g. Dual 4-input NANDs:
930 = 6K P/U
932 = 2K P/U, driver
944 = O/C, driver
961 = 2K P/U
The 935 was a 936 w/o any input diodes.
Extendable (expandable) indicated a connection that bypassed
the input diodes so that it could be externally expanded with
more diodes or an extender like the 933.
I still have some of these (maybe even some RTL) and of course the
Databooks.
Fairchild's DTL had a '9' prefix; NS used 'DM'
m
-----Original Message:
Date: Thu, 06 Mar 2008 07:54:50 -0800
From: Bob Rosenbloom <bobalan at sbcglobal.net>
Subject: Re: Obsolete chips
dwight elvey wrote:
> Hi
> Here is a list of the DTL that Anchor has. Does anyone have
> a pinouts and types for these??
>
>
> 930
> 932
> 934
> 936
> 937
> 946
> 948
> 951
> 958
> 962
> 1800
> 9093
> 9034
> 9099
>
> Knowing what these are would help in knowing what other DTL
> numbers are the same part.
> Dwight
>
I have data sheets for the following:
930 = expandable dual 4-input NAND
932 = expandable dual 4-input buffer
934 = hex inverter
936 = hex inverter
937 = hex inverter
946 = quad inverter
948 = clocked flip-flop
951 = multivibrator
962 = quad 2-input NAND gate plus inverter
Bob
---------Reply:
Hmm, I have slightly different info:
946 = Quad 2-input NAND
962 = Triple 3-input NAND
On the other hand I can't find a 934 listed in my books...
In addition:
958 = Quad 2-input power gate
1800 = Dual 5-input NAND
9093 = Dual J-K
9034 - S/B 9094 = Dual J-K
9099 = Dual J-K
Also listed at Anchor:
935 = Hex Inverter (extendable)
949 = Quad 2-input NAND
Equivalent devices usually differ in the value of the pullup resistor
(if any):
e.g. Dual 4-input NANDs:
930 = 6K P/U
932 = 2K P/U, driver
944 = O/C, driver
961 = 2K P/U
The 935 was a 936 w/o any input diodes.
Extendable (expandable) indicated a connection that bypassed
the input diodes so that it could be externally expanded with
more diodes or an extender like the 933.
I still have some of these (maybe even some RTL) and of course the
Databooks.
Fairchild's DTL had a '9' prefix; NS used 'DM'
m
> Date: Thu, 06 Mar 2008 07:54:50 -0800
> From: Bob Rosenbloom
> Subject: Re: Obsolete chips
All of the following are from the Motorola Big Brown Book:
> 930 = expandable dual 4-input NAND
...
958 - Dual 2-input NAND Power gate
1800 - Dual 5-input NAND gate
The following were obtained from a "direct replacement" chart:
9093 - Dual J-K flip flop (same as 953)
9099 - Dual J-K flip flop (same as 952)
I can find a mention in an old catalog of this one, but have no
additional information:
9034 - 256 bit ROM
Cheers,
Chuck
