Display-less computing

Paul Koning paulkoning at comcast.net
Sat Dec 12 15:35:26 CST 2015

> On Dec 12, 2015, at 4:26 PM, Jon Elson <elson at pico-systems.com> wrote:
> On 12/12/2015 11:17 AM, William Donzelli wrote:
>>> Sometime later, maybe around 1971 they got some IBM 2741 terminals which
>>> were Selectric typewriters connected to an interface.  Later they got some
>>> IBM 2260's, which were Zenith 9" TV sets and a keyboard connected to an
>>> interface box in the machine room.  Very primitive, but very interactive,
>>> great for quick program editing and submission.
>> Were 2260s really Zenith products inside? I certainly could believe
>> it, judging from the tube lineup. Someday I would like to see one up
>> close and personal.
> Yes, they were hideous hacks of a cheap TV set.  The VHF tuner was still in there, as it was needed to complete the series filament chain.  They had 5 tubes in series, with 26-volt filaments, running off 120 V AC.  I'm PRETTY sure the brand was Zenith, but this is from about a 43-year old memory of pulling the cover off one.  All it had was a keypunch-style keyboard and the TV, all the electronics were in the machine room.

I thought 2260s had a green CRT.


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