[GreenKeys] Model 28

[tony.podrasky]

Hello Brad;

There was no link provided - so I can't see what kind of machine it is.

There are A REAL LOT of obstacles in getting the 28 to talk with a computer:

1. The 28 is a 5-level machine (uses 5 bits to communicate) The computer
    uses a 33 Teletype machine which is 8-level (uses 8 bits to 
communicate). The 28 has a 32 possible characters. the 33 has 256.

2. The 28 runs at 45.45 BAUD where as the 33 runs at 110 BAUD. You would
    need to write a program to convert the speeds.

3. The computer may have a RS-232 EIA interface where as the 28 has a 60ma
current loop.

4. If your computer doesn't care about upper/lower case characters
(in other words, it sees an "A" the same as it sees an "a", you'll
be further ahead). My Linux box CARES about the case - so I had to
put "hooks" into my keyboard routine to tell the computer when I
was switching cases with my 35-KSR.

I got it to work, and it was worth every second I put into getting it
to work (I was after the CHALLENGE and not the RESULTS) but it was
pretty useless from a practicality standpoint.

UE,
K2EAA - TONY
NNNN
ZCZC

On 10/21/2015 09:52 AM, Brad wrote:
> Hi there,
>
> Was looking at this auction with curiosity: greenkeys at mailman.qth.net
> <mailto:greenkeys at mailman.qth.net>
>
> It looks to me like he’s got two different teletypes in the photos?
> Thinking the second one is the correct one?
>
> Having the reperforator – does that make this Model 28 an ASR?
>
> I’m also wondering how hard it’d be to rig something up so that it could
> communicate with a computer such as the Altair 8800.  I understand these
> models use different encoding.
>
> Thanks so much for your help!
>
> Brad

-- 
The best index to a person's character is
a. how he treats people who can't do him any good, and
b. how he treats people who can't fight back.
                                     -Abigail Van Buren