[GreenKeys] Navy Teletype Message Generator

[Jeff G]

Unfortunately the VOLPE board can't make heads or tails of it either, no
matter what baud or mode I use. Either the baud rate is wrong or I dunno
what. In 45 baud mode, it prints gibberish similar but not identical to
what the machine prints. I may have to take it back out to the garage and
fire up the logic analyzer lol. Then I can also check to see the
ASCII/BAUDOT pin on the MM rom to see what mode its actually using.

Jeff

On Tue, Jan 24, 2023 at 4:56 PM <hwhall at compuserve.com> wrote:

> 5815 maps to Federal Supply Classification (FSC) 5815 = Teletype and
> Facsimile Equipment.
> Google hasn't made any sense out of the other numbers yet.
>
> Wayne
> WB4OGM
>
> -----Original Message-----
> From: Jeffrey Golas <jeffg at junknet.net>
> To: Greenkeys <greenkeys at mailman.qth.net>
> Sent: Tue, Jan 24, 2023 7:40 am
> Subject: [GreenKeys] Navy Teletype Message Generator
>
> Thought you guys and gals might find this interesting...I volunteer on
> Battleship NJ and found this tucked away. Appears to be Navy-like but
> mentions "project" on it, serial #3 lol. Other than WMS on the board theres
> no manufacturer.
>
> Its a RTTY/Teletype message generator that does the "quick brown fox"
> message. Whats really interesting is that all that is based on ONE chip
> whose sole purpose is exactly that. A MM5220DF. Other chips in that series
> have similar purposes, like ASCII-BAUDOT conversion.
>
> Theres what looks like a white CPU, but Icant find any docs on it. It
> almost looks like something they had a surplus of, and with no rom,
> possibly wired it as a NOP (no-operation) so that it would just be an 8 bit
> counter. I think anyway.
>
> It does seen to work after cleaning all the switches, I plan to test on
> the loop. All it does is keying via a solid state relay. I tried piping my
> signal gen through it but Fldigi couldnt decode.
>
>
>
>
> Jeff KC3GJX
>
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