12 Dec
2008
12 Dec
'08
9:45 p.m.
Subject: Re: Commodore PET RS-232
From: Fred Cisin <cisin at xenosoft.com>
Date: Fri, 12 Dec 2008 18:22:39 -0800 (PST)
To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at
classiccmp.org>
On Fri, 12 Dec 2008, Dave Caroline wrote:
DEC had boards like that for going from TTL to RS232 as modules and
for current loop (TTY) to RS232 or the other way around. There were
a lot of "things" that often had oddball interfaces like Ham radio
tranceivers that could be driven by computer but only had serial TTL.
Allison
should be a way/was a way to use the 6522 VIA
chip it will need
translation to rs232 levels though
Does anybody here remember a thread from last month called:
Re: RS232 voltage level converter box
(trying to figure out what a board with 1488s and 1489s was for)
14 Dec
14 Dec
1:45 p.m.
On 12 Dec 2008 at 21:45, Allison wrote:
DEC had boards like that for going from TTL to RS232
as modules and
for current loop (TTY) to RS232 or the other way around. There were
a lot of "things" that often had oddball interfaces like Ham radio
tranceivers that could be driven by computer but only had serial TTL.
The one in question was hand-wired on pad-per-hole perfboard. I
submit that its purpose may never be known.
I'd have to rattle my brains quite a bit to even get an inkling for
the application of some of the bits of perfboard with stuff on them
in my hellbox that I built years ago. I ran across tiny one the
other day with two 7475s (not LS) with a header on it. I don't have
a clue about the application, but it probably goes back pretty far.
Cheers,
Chuck
15 Dec
15 Dec
6:07 p.m.
DEC had boards like that for going from TTL to RS232
as modules and
for current loop (TTY) to RS232 or the other way around. There were
a lot of "things" that often had oddball interfaces like Ham radio
tranceivers that could be driven by computer but only had serial TTL.
You can use the good old max 232 and 5 1?F caps.
7:04 p.m.
On 15 Dec 2008 at 21:07, Alexandre Souza wrote:
I bought a tubeful of TI MAX232Ns, thinking that they were the same
as the MAX232A--nope, the "N" takes 1.0 uF caps and the "A" uses 0.1
uF.
If I had to do it over again, I'd use a MAX233 (only a single 1.0 uF
decoupling cap) or a MAX202 (0.1 uF caps).
Cheers,
Chuck
DEC had boards
like that for going from TTL to RS232 as modules and
for current loop (TTY) to RS232 or the other way around. There were
a lot of "things" that often had oddball interfaces like Ham radio
tranceivers that could be driven by computer but only had serial TTL.
You can use the good old max 232 and 5 1?F caps.
5731
days inactive
5734
days old
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