Data General NOVA 4/C help

R SMALLWOOD rodsmallwood52 at
Mon Oct 19 00:40:04 CDT 2015

     If the terminal is rs232 get a break out box if you don't already have one.
If terminal plug is a 25way D type connect pins 2 and 3 then see if you get an echo back.
Some times the terminal looks for a control signal but 99% of the time pins 2,3 and 7 (ground) are all you need
Speed, parity and stop bits are probably ok if the terminal was part of the system 
The BOB will tell you if the CPU serial port is alive. LEDS on pins 2 and 3 should be on.

Once the terminal is running then you should get some kind of response from the system.


----Original message----
>From : cube1 at
Date : 18/10/2015 - 20:26 (UTC)
To : cctalk at
Subject : Re: Data General NOVA 4/C help

On 10/18/2015 1:32 PM, Henk Gooijen wrote:
> Thanks Jay and Rod,
> you gave me a lot of pointers to check. I agree that getting
> a console working is on top of the todo list. However, I better
> put on old clothes for next Saturday. I want to have at least
> a look at the head lock and shipping bracket, but do not want
> to remove the disk out of the rack again. Although I can lift
> it on my own, I did feel my back that evening :-/
> So, it will be sliding out the drive and then crawl under it,
> laying on the floor removing the bottom cover ...

Yup.  I know that drill only too well.

> Haven't thought about looking in the eclipse folder on bitsavers!
> Gonna look for that Virtual Console. The papers that came with
> the system tell about a single letter to start the application,
> not xxxxxL, so there might be a console ROM.
> I can probe the header pins on the "multiplexer" paddle board
> to which the terminal connects with a "BERG" header. There are
> just 3 wires, so that must be RxD, TxD and GND.
> tnx!
> - Henk

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