Plug and Play RS-232 Connection for Teletype Model 33

General discussions related to the Altair 8800 Clone

Plug and Play RS-232 Connection for Teletype Model 33

Postby AltairClone » October 7th, 2018, 4:14 pm

I've developed a small board that provides a plug and play connection between a Teletype Model 33 and an RS-232 serial port. Here's a link to a video that demonstrates the new board. (If you don't want to watch the whole video, start watching at the 4:20 mark in the video.)

https://youtu.be/PNbo46Yw92M

The new board plugs directly onto the P2 connector in the rear of the Model 33 Teletype where it picks up the transmit and receive data loops and also picks up power from the 48vac supply provided on the connector. The RS-232 connection is via an RJ-14 modular jack. Modular DB-25 and DB-9 connectors for the other end of the cable are still readily available.

The board uses SMT components and the 16 pin switching regulator has 0.5mm lead spacing. In addition, the back of the regulator (inaccessible with a soldering iron) is a large ground pad and must be soldered to the board for proper thermal conduction. For these reasons, the board will have to be pre-assembled by an SMT assembly house.

Pricing will be $40-$70 depending on how many boards I run. If you are seriously interested in buying one of these boards, please contact me at deramp5113 followed by ASCII 0x40 followed by the yahoo domain name so I can get a count started and run the first batch as soon as possible.

Mike
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Re: Plug and Play RS-232 Connection for Teletype Model 33

Postby toml_12953 » October 10th, 2018, 10:12 am

While I'm waiting for the board itself to become available, I ordered the modular plugs to go with it. I ordered both DE-9 and DB-9 connectors since I'll be swapping between the Altair Clone and a PC. The wires of the connectors aren't in the shells, though. You have to plug them in so I need to know the pinout of the board so I can get these assembled and ready.

P.S. Any progress on either the Kenbak-1 or IMSAI? How about an Altair 8800B front panel for the Clone? Am I ever satisfied? Heck no! :)
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Re: Plug and Play RS-232 Connection for Teletype Model 33

Postby AltairClone » October 10th, 2018, 8:05 pm

toml_12953 wrote:The wires of the connectors aren't in the shells, though. You have to plug them in so I need to know the pinout of the board so I can get these assembled and ready.


I’ll be putting together some instructions for the interface board that will include an illustration of how to determine modular connector wiring. Pin numbers and wire colors are ambiguous with phone wiring depending on whether you’re a telephone or a telephone jack - much like RS-232 signal names are confusing depending on whether you’re DCE or DTE.

Mike
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