[GreenKeys] Navy Teletype Message Generator

[hwhall at compuserve.com]

Maybe the character ROM is scrambled? (Did it use one?) Or a clock speed is way off?
FWIW, Z71105 corresponds to a DoD Activity Address Directory (DODAAD) Code for COMMANDER, FIFTH COAST GUARD DISTRICT (F), FEDERAL BUILDING, 431 CRAWFORD STREET, PORTSMOUTH, VA 23705.  Apparently part of the Norfolk Naval Shipyard. May be a coincidence.

WayneWB4OGM

-----Original Message-----
From: Jeff G <jeffg at junknet.net>
Cc: greenkeys at mailman.qth.net <greenkeys at mailman.qth.net>
Sent: Tue, Jan 24, 2023 6:06 pm
Subject: Re: [GreenKeys] Navy Teletype Message Generator

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.

WayneWB4OGM

-----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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