raspberry Pi

[Doug Luurs]

Yup .. Since January

http://www.raspberrypi.org/archives/3094


-----Original Message-----
From: filepro-list-bounces+doug.luurs=gmail.com at lists.celestial.com [mailto:filepro-list-bounces+doug.luurs=gmail.com at lists.celestial.com] On Behalf Of Brian K. White
Sent: Thursday, May 02, 2013 4:23 PM
To: filepro-list at lists.celestial.com
Subject: Re: raspberry Pi

On 5/2/2013 1:28 PM, Henry Arredondo wrote:
> Hi,
>
> I got the raspberry pi and I want to use it to ssh to a SCO box like a dumb terminal, I tested it but the DEL key is not working, Do you know the terminal emulation needed when using linux -> SCO Unix ?
>
> Is it possible to install filepro running an ARM microprocessor, the raspberry can run any of these distros already :
>
> Raspian wheezy.. It's a reference root filesystem from Alex and Dom, 
> based on the Raspbian<http://www.raspbian.org/> optimised version of 
> Debian, and containing LXDE, Midori, development tools and example 
> source code for multimedia functions
>
> Soft-float debian wheezy .. This image is identical to the Raspbian "wheezy" image, but uses the slower soft-float ABI. It is only intended for use with software such as the Oracle JVM<http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1637583.html> which does not yet support the hard-float ABI used by Raspbian.
>
> Arch linux ARM...Arch Linux ARM is based on Arch Linux, which aims for simplicity and full control to the end user. Note that this distribution may not be suitable for beginners. The latest version of this image uses the hard-float ABI, and boots to a command prompt in around ten seconds.
>
> Thanks
>
> Henry Arredondo

The answer is complicated.

You can make the console on the rasberry pi work as a sco console with some effort, and at the expense of slightly breaking all the local linux applications. It's so messy I will not actually get into it unless you convince me that that's really what you want is to make a completely broken linux system on the pi, but it will function as a scoansi dumb terminal and you don't care at all about using the pi for it's own local linux system and you won't be doing updates even.

Or were you even talking about the console or were you talking about xterm or lxterm or some other xterm-alike? which is a totally different problem and totally different answers.

The real answer is, you do not make the linux console or xterm apps emulate a sco console, you tell the sco system what your terminal is, which is linux or xterm, or you run a terminal _emulator_ app, to _emulate_ a sco console.

That means copying linux and xterm terminal definitions from termcap and terminfo from linux to sco, and in /etc/profile on sco add a few lines to detect if TERM is linux or xterm and in that case run an stty command to change the break key to ctrl-c: "stty intr ^c"

If your terminal is the linux console or an xterm-alike, the del key can not be used as the break key because those terminals emit a multi-byte sequence ^[[3~ from the Del key, not a single byte. A sco console emits a single byte "^?" from the Del key, so it can be used as break.

There ARE ways to hack both the linux console and most xterm-alike apps to change what the keys do, like you could make the Del key send ^? 
instead of ^[[3~ , but when you do that you break the terminal for every other app because it's still called "linux" or "xterm" but it is no longer doing what linux or xterm terminals do.

So if you want to ask instead how to teach the sco box to recognize a linux console or xterm, that I can answer in detail.

Or if you want to ask instead what is a good sco-ansi emulator app that you can run on a raspberry pi, I don't know off-hand, but that also is at least a valid question. In gui there is a linux version of putty that can do an OK job of emulating scoansi. The pi may not have the horsepower but you can also run most windows terminal emulators in wine.
Or you could take any xterm-based app and possibly modify it enough through .Xdefaults without having to modify it's source code, and make a special menu entry or desktop icon that loads the special config without breaking the app the rest of the time for everything else. Outside of gui I don't know any console apps that can emulate scoansi but there might be one somewhere.

But asking how to make the the linux console behave as a sco console... 
that's only a valid question in the way that shooting yourself in the foot is a valid wish.

Another idea, is there a FreeBSD port yet?
The freebsd console calls itself "cons25" in the TERM variable, which the sco box will not recognize by default, but it is almost exactly the same as the sco console, including that it sends ^? from it's Del key. I don't think the freebsd system defaults to using Del for break the way sco does, but it can at least. If you installed freebsd on the pi, it's Del key would send ^?, so when you then ssh to a sco box, Del would work as break. You'd still have to do a little hacking on the sco box. Maybe as little as simply overwriting TERM to say TERM=ansi.

--
bkw
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