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View Full Version : Serial / null-modem cable for Model 4?



blakespot
April 22nd, 2008, 09:46 AM
I am interested in setting up a TRS-80 Mode 4 to function as a VT-100 terminal into my Mac Pro. Does anyone know where I can get a serial cable to start with? Thanks.



blakespot

:: Byte Cellar - the vintage computing weblog
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Erik
April 22nd, 2008, 11:06 AM
Serial cables are still available from a variety of sources.

Black Box (http://www.blackbox.com/Catalog/Detail.aspx?cid=45,85,790&mid=5458)carries them, as does DigiKey (http://parts.digikey.com/1/parts/12976-rs232-cable-db9m-db9f-6-feet-45-308.html) and others.

You'll need to figure out your configuration, though. I suspect a DB9 to DB25 null model will work.

blakespot
April 22nd, 2008, 11:36 AM
Thanks.

Doesn't the Gate Array model 4 (early) with the ports out the bottom have an edge-connector for a serial port? Or is it using a std DB-25?

I will be using this with a USB to serial coverter of some sort and am not sure, yet, what kind of port it will have. I have one at the office...

http://flickr.com/photos/blakespot/2376237596/in/set-72157604316614196/

...that uses a mini-DIN 8 port (Mac style), but I don't necessarily need to get that config for the unit at the house.

Tnx.




blakespot

Erik
April 22nd, 2008, 12:13 PM
Thanks.

Doesn't the Gate Array model 4 (early) with the ports out the bottom have an edge-connector for a serial port? Or is it using a std DB-25?

Hmm. It might. I'm not sure how it's cabled but if it's an edge connector then you'll probably have to wire something yourself. Serial's not too hard, though. There are only 2 required wires and a few support signals if you want/need them.


I will be using this with a USB to serial coverter of some sort and am not sure, yet, what kind of port it will have.

Eww. I've never had any luck with these. I have one at home that consistently blue-screens my XP box. I ordered an honest-to-god serial card for my nForce motherboard just so I can chuck the converter.

RichCini
April 23rd, 2008, 04:04 AM
Hmm. It might. I'm not sure how it's cabled but if it's an edge connector then you'll probably have to wire something yourself. Serial's not too hard, though. There are only 2 required wires and a few support signals if you want/need them.



Eww. I've never had any luck with these. I have one at home that consistently blue-screens my XP box. I ordered an honest-to-god serial card for my nForce motherboard just so I can chuck the converter.

Erik:

On XP, I've actually had good success with the Belkin PDA adapter. Also, the USB->serial adapter from Parallax is very good and provides complete handshaking. I use it with my Basic STAMP software and with cable, it's only $15. The Belkin one you can find on eBay for about the same price but the old (squared) model doesn't do full handshaking so some things -- like the Parallax software -- won't work. I use both when working with my IMSAI and they work fine.

wd0dbs
April 23rd, 2008, 05:30 AM
If memory serves me, Model 4 all used standard db25. But I'm at the office and can't check mine. Whether it was gate array or not. The trick was the 90 degree turn right after coming out of the case.


Doug

Terry Yager
April 23rd, 2008, 10:29 AM
Yeah, the parallel port is the edge-thinggy. (Sorry for the techie jargon).

--T