Date: Wed, 05 Dec 2007 17:55:51 -0800
From: "Chuck Guzis" <cclist at sydex.com>
Subject: Re: Almost OT: Pushbutton switch latching
(No "almost" about it any more...)
>On 5 Dec 2007 at 17:35, Fred Cisin wrote:
>> . . . then I guess that a rotary telephone dial is out of the question
>Oooh, cool--Strowger switches!
-------------
Pshaw; a mere 10 positions? I've got a 25-step 12-pole stepper here,
just the ticket. Expandable? I'll say; add one of your 10-steps and you've
got 250 positions.
mike
>
>Subject: Hazeltine 1200
> From: Les Hildenbrandt <les at hildenbrandt.com>
> Date: Thu, 06 Dec 2007 07:40:14 -0700
> To: cctech at classiccmp.org
>
>My first computer came with a Hazeltine 1000, this was older than the
>1200. It had 80 characters wide, but I think it only was 12 lines tall,
I remember it as 72 (tty width).
>I cant remember that part for sure. What I remeber for sure was that it
>was upper case only. There was a place of the PCB for a second
>character generator rom for lower case which was not loaded. There was
>also a switch on the front which enabled lower case for the keyboard.
>That was very confusing because sometimes I was typing in lower case,
>then when I did a search or search / replace in ed it couldn't find what
>I was searching for because it was upper case. I didn't figure that out
>until later when I got an intertube terminal to replace the Hazeltine 1000.
;)
Allison
>Les
>
>Subject: Re: Hazeltine 1200
> From: Sridhar Ayengar <ploopster at gmail.com>
> Date: Thu, 06 Dec 2007 10:09:00 -0500
> To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org>
>
>Allison wrote:
>>>> My father just rescued a Hazeltine 1200 from a
>>>> scrapheap for me. I know
>>>> nothing about these. Could someone give me some
>>>> pointers to
>>>> information? Thanks.
>>>>
>>> Nice! I don't know anything about the 1200, but I have
>>> a 1500 and a 1421. They are both just simple
>>> terminals, with some fairly basic control functions
>>> What does it look like? Is the keyboard integral or
>>> detatched? Does it look like the 1500/1400 series? -
>>
>> The 14xx and 15xx are late 70s (after 1976) as 1500 used
>> 8080 and the 1400 used 8048 cpus.
>
>Interesting. 8048 is an integrated microcontroller, no?
Yes but it has an external databas and addressing for extended
configurations. Basically a subset of 8051.
Allison
>>> http://vt100.net/manx/covers/14/hi-1056a.png.
>>>
>>> Now, if it looks like the 2000, you've got a great
>>> score. Those are some interesting beasts. I've never
>>> seen one, but they look like this.
>>> http://www.columbia.edu/acis/history/h2000s.gif
>>>
>>> The Hazeltine 2000 was a very early video terminal
>>> (circa 1972).
>>
>> The 1200 was a basically glass tty, all uppercase
>> (may have had a back pannel option for all upper
>> tty mode or mixed) it was capable of slow baud rates
>> (I think to 1200 or 4800) and both RS232 or current
>> loop. I used on on the DEC PDP10 so that means it
>> was in house there by spring 1972. It was all logic
>> no cpu used and I belive it used serial PMOS shift
>> registers for storage.
>
>Wow. Neato!
>
>Peace... Sridhar
>
>Subject: Re: Hazeltine 1200
> From: Dave McGuire <mcguire at neurotica.com>
> Date: Thu, 06 Dec 2007 09:24:29 -0500
> To: "General Discussion: On-Topic Posts Only" <cctech at classiccmp.org>
>
>On Dec 5, 2007, at 10:02 PM, Sridhar Ayengar wrote:
>>>> My father just rescued a Hazeltine 1200 from a scrapheap for me.
>>>> I know nothing about these. Could someone give me some pointers
>>>> to information? Thanks.
>>> Nice! Let us know the date codes on the chips when you get a chance
>>> to peek inside.
>>
>> Will do.
>
> I'm also curious about what processor it's built around, if you
>don't mind checking.
Best of my knowledge only the 15xx and 24xx serius used a processor
and the earlier ones wer random logic and simple state machines.
Allison
>
> -Dave
>
>--
>Dave McGuire
>Port Charlotte, FL
>Farewell Ophelia, 9/22/1991 - 7/25/2007
>
>
>
>Subject: Re: Hazeltine 1200
> From: Dave McGuire <mcguire at neurotica.com>
> Date: Thu, 06 Dec 2007 10:33:17 -0500
> To: "General Discussion: On-Topic Posts Only" <cctech at classiccmp.org>
>
>On Dec 6, 2007, at 10:09 AM, Sridhar Ayengar wrote:
>>>>> My father just rescued a Hazeltine 1200 from a
>>>>> scrapheap for me. I know nothing about these. Could someone
>>>>> give me some
>>>>> pointers to information? Thanks.
>>>>>
>>>> Nice! I don't know anything about the 1200, but I have
>>>> a 1500 and a 1421. They are both just simple
>>>> terminals, with some fairly basic control functions
>>>> What does it look like? Is the keyboard integral or
>>>> detatched? Does it look like the 1500/1400 series? -
>>> The 14xx and 15xx are late 70s (after 1976) as 1500 used
>>> 8080 and the 1400 used 8048 cpus.
>>
>> Interesting. 8048 is an integrated microcontroller, no?
>
> Yes it is; sorta a predecessor to the 8051 family.
Yes, and it can also address up to 4k of program either
internal (up to 2K for the 8049) and axternal. It's possible
to hand external ram on it as well but the pointer is only
8bits so larger ram has to be paged using IO pins.
Allison
> -Dave
>
>--
>Dave McGuire
>Port Charlotte, FL
>Farewell Ophelia, 9/22/1991 - 7/25/2007
>
>
This should be a much simpler problem than I'm making
it, but at the moment my brain doesn't want to come up
with a solution.
Picture this - a number of switches, say, eight.
Momentary contact, normally open switches. And then
eight outputs, one for each switch, TTL level. I want
to be able to push one switch and bring it's
corresponding output high, and have it stay high even
when the switch is released. But, making this more
complicated, I only want to be able to allow one
switch to be active at a time. So, say switch four is
pressed, output four is high. Then, switch one is
pressed, and output four goes low, and output 1 goes
high. Timing is not critical.
I know this should be a simple array of flip flops, in
some fashion, but at the moment, the solution eludes
me. I feel like there is probably even a single/two
chip solution to this.
Now, I know that this is probably off-topic, but I'd
be using this in on-topic hardware...
-Ian
I grew up using these things, and have been trying to find one, for nostalgia reasons.
does anyone on the list have one they'd be willing to part with?
Yes, I've tried every other avenue I can think of
PS - sorry if this is "off-topic"
Dan.
_________________________________________________________________
Exercise your brain! Try Flexicon!
http://puzzles.sympatico.msn.ca/chicktionary/index.html?icid=htmlsig
>
>Subject: Re: Hazeltine 1200
> From: Mr Ian Primus <ian_primus at yahoo.com>
> Date: Wed, 05 Dec 2007 11:43:14 -0800 (PST)
> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
>
>
>--- Sridhar Ayengar <ploopster at gmail.com> wrote:
>
>>
>> My father just rescued a Hazeltine 1200 from a
>> scrapheap for me. I know
>> nothing about these. Could someone give me some
>> pointers to
>> information? Thanks.
>>
>> Peace... Sridhar
>>
>
>Nice! I don't know anything about the 1200, but I have
>a 1500 and a 1421. They are both just simple
>terminals, with some fairly basic control functions
>What does it look like? Is the keyboard integral or
>detatched? Does it look like the 1500/1400 series? -
The 14xx and 15xx are late 70s (after 1976) as 1500 used
8080 and the 1400 used 8048 cpus.
>http://vt100.net/manx/covers/14/hi-1056a.png.
>
>Now, if it looks like the 2000, you've got a great
>score. Those are some interesting beasts. I've never
>seen one, but they look like this.
>http://www.columbia.edu/acis/history/h2000s.gif
>
>The Hazeltine 2000 was a very early video terminal
>(circa 1972).
The 1200 was a basically glass tty, all uppercase
(may have had a back pannel option for all upper
tty mode or mixed) it was capable of slow baud rates
(I think to 1200 or 4800) and both RS232 or current
loop. I used on on the DEC PDP10 so that means it
was in house there by spring 1972. It was all logic
no cpu used and I belive it used serial PMOS shift
registers for storage.
Allison
>-Ian
My first computer came with a Hazeltine 1000, this was older than the
1200. It had 80 characters wide, but I think it only was 12 lines tall,
I cant remember that part for sure. What I remeber for sure was that it
was upper case only. There was a place of the PCB for a second
character generator rom for lower case which was not loaded. There was
also a switch on the front which enabled lower case for the keyboard.
That was very confusing because sometimes I was typing in lower case,
then when I did a search or search / replace in ed it couldn't find what
I was searching for because it was upper case. I didn't figure that out
until later when I got an intertube terminal to replace the Hazeltine 1000.
Les
