Re: How to build an ASCII CRT terminal, circa 1967

[COURYHOUSE]

same as univac  uniscope  or? 
 
 
In a message dated 8/31/2016 8:41:06 A.M. US Mountain Standard Time,  
a...@bitsavers.org writes:



On 8/31/16 8:35 AM, Paul Berger wrote:
> it would be  possible  to have it generate 7 bit ASCII
> code by using an  appropriately "programmed" interposer under the keys.

it does say the  keyboard generates ASCII on pg 3-2 of the maint  manual..

Re: How to build an ASCII CRT terminal, circa 1967

[Mike Stein]

Oops... should have read:

Looks like the folder changed from 70-750 to 70-752:

http://bitsavers.trailing-edge.com/pdf/rca/terminal/70_752/70-01-752-U_Model_70_752_Video_Data_Terminal_Maintenance_Manual_Oct73.pdf

- Original Message - 
From: "Eric Christopherson" <echristopher...@gmail.com>
To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk@classiccmp.org>
Sent: Wednesday, August 31, 2016 12:09 PM
Subject: Re: How to build an ASCII CRT terminal, circa 1967


> On Wed, Aug 31, 2016 at 10:15 AM, Al Kossow <a...@bitsavers.org> wrote:
> 
>> Magnetorestrictive delay lines and a charactron.
>>
>> http://bitsavers.org/pdf/rca/terminal/70_750/70-01-752-U_
>> Model_70_752_Video_Data_Terminal_Maintenance_Manual_Oct73.pdf
>>
>> We got one (no keyboard) a couple days ago with the manual. I'm still
>> cleaning it up. It had something nesting in it and
>> the inside has sunflower seed husks in it. It was made with plastic DIP
>> ICs, no idea of the logic family. The keyboard
>> was made by IBM, don't know what character code it produces. Pretty funky
>> if it encodes ASCII.
> 
> 
> That URL redirects to
> http://www.mirrorservice.org/sites/www.bitsavers.org/pdf/rca/terminal/70_750/70-01-752-U_Model_70_752_Video_Data_Terminal_Maintenance_Manual_Oct73.pdf
> , which is showing a 404.
> 
> 
> -- 
>Eric Christopherson

Re: How to build an ASCII CRT terminal, circa 1967

[Mike Stein]

Looks like the folder name changed from 70_750 to 70_752:

- Original Message - 
From: "Eric Christopherson" <echristopher...@gmail.com>
To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk@classiccmp.org>
Sent: Wednesday, August 31, 2016 12:09 PM
Subject: Re: How to build an ASCII CRT terminal, circa 1967


> On Wed, Aug 31, 2016 at 10:15 AM, Al Kossow <a...@bitsavers.org> wrote:
> 
>> Magnetorestrictive delay lines and a charactron.
>>
>> http://bitsavers.org/pdf/rca/terminal/70_752/70-01-752-U_
>> Model_70_752_Video_Data_Terminal_Maintenance_Manual_Oct73.pdf
>>
>> We got one (no keyboard) a couple days ago with the manual. I'm still
>> cleaning it up. It had something nesting in it and
>> the inside has sunflower seed husks in it. It was made with plastic DIP
>> ICs, no idea of the logic family. The keyboard
>> was made by IBM, don't know what character code it produces. Pretty funky
>> if it encodes ASCII.
> 
> 
> That URL redirects to
> http://www.mirrorservice.org/sites/www.bitsavers.org/pdf/rca/terminal/70_752/70-01-752-U_Model_70_752_Video_Data_Terminal_Maintenance_Manual_Oct73.pdf
> , which is showing a 404.
> 
> 
> -- 
>Eric Christopherson

Re: How to build an ASCII CRT terminal, circa 1967

[Eric Christopherson]

On Wed, Aug 31, 2016 at 10:15 AM, Al Kossow  wrote:

> Magnetorestrictive delay lines and a charactron.
>
> http://bitsavers.org/pdf/rca/terminal/70_750/70-01-752-U_
> Model_70_752_Video_Data_Terminal_Maintenance_Manual_Oct73.pdf
>
> We got one (no keyboard) a couple days ago with the manual. I'm still
> cleaning it up. It had something nesting in it and
> the inside has sunflower seed husks in it. It was made with plastic DIP
> ICs, no idea of the logic family. The keyboard
> was made by IBM, don't know what character code it produces. Pretty funky
> if it encodes ASCII.


That URL redirects to
http://www.mirrorservice.org/sites/www.bitsavers.org/pdf/rca/terminal/70_750/70-01-752-U_Model_70_752_Video_Data_Terminal_Maintenance_Manual_Oct73.pdf
, which is showing a 404.


-- 
Eric Christopherson

Re: How to build an ASCII CRT terminal, circa 1967

[Al Kossow]

On 8/31/16 8:35 AM, Paul Berger wrote:
> it would be possible  to have it generate 7 bit ASCII
> code by using an appropriately "programmed" interposer under the keys.

it does say the keyboard generates ASCII on pg 3-2 of the maint manual..

Re: How to build an ASCII CRT terminal, circa 1967

[Paul Berger]

On 2016-08-31 12:15 PM, Al Kossow wrote:

Magnetorestrictive delay lines and a charactron.

http://bitsavers.org/pdf/rca/terminal/70_750/70-01-752-U_Model_70_752_Video_Data_Terminal_Maintenance_Manual_Oct73.pdf

We got one (no keyboard) a couple days ago with the manual. I'm still cleaning 
it up. It had something nesting in it and
the inside has sunflower seed husks in it. It was made with plastic DIP ICs, no 
idea of the logic family. The keyboard
was made by IBM, don't know what character code it produces. Pretty funky if it 
encodes ASCII.



Nice a selectric keyboard... It looks like it has links that operates a 
microswitch for each of the bails.  The bails that would get pulled when 
the filter shaft comes around would depend on the tabs present on the 
key interposers, so the key interposers would determine the coding of 
the keyboard and it would be possible  to have it generate 7 bit ASCII 
code by using an appropriately "programmed" interposer under the keys.


Paul.

How to build an ASCII CRT terminal, circa 1967

[Al Kossow]

Magnetorestrictive delay lines and a charactron.

http://bitsavers.org/pdf/rca/terminal/70_750/70-01-752-U_Model_70_752_Video_Data_Terminal_Maintenance_Manual_Oct73.pdf

We got one (no keyboard) a couple days ago with the manual. I'm still cleaning 
it up. It had something nesting in it and
the inside has sunflower seed husks in it. It was made with plastic DIP ICs, no 
idea of the logic family. The keyboard
was made by IBM, don't know what character code it produces. Pretty funky if it 
encodes ASCII.