[Coco] Re: Coco printer primer...
gene.heskett at verizon.net
Wed Feb 15 23:31:49 EST 2006
On Wednesday 15 February 2006 17:58, Torsten Dittel wrote:
>> I have access to an Okidata 320T (OS compatible down to MS DOS, and
>> emulates IBM ProPrinter III, Epson Fx-80, ANSI and Oki Microline)
>> with a RS-232C serial adapter that works great. Would making a
>> serial cable to work with the 'bit banger' port (do not have a
>> RS-232c cart yet) be difficult? I know on a PC this wouldn't be a
>> problem, but, using the four pins from the b/b port to a 25 pin
>> sounds too easy of a solution...
>Well, the signal levels of RS-232 (logical "one" is between -12V and
>-3V, "zero" between +3V and +12V) are different from what's on the
>bitbanger port (0V or 5V). Normally you'd need a small circuit with
> it's own power supply which contains a MAX232 compatible IC which
> will adapt the CoCo's levels to the standard. However, some printers
> might accept the CoCo's signals and I'm sure there's a workaround
> without too much hardware efforts. Another question is if you have
> real CTS/RTS hardware handshake or XON/XOFF protocol software
I think your bit-banger is busted if its only doing 0-5 volts. The one
time I checked one of mine it was doing + and - around 7.5 volts, more
than enough to meet the 232 specs.
People having trouble with vz bouncing email to me should add the word
'online' between the 'verizon', and the dot which bypasses vz's
stupid bounce rules. I do use spamassassin too. :-)
Yahoo.com and AOL/TW attorneys please note, additions to the above
message by Gene Heskett are:
Copyright 2006 by Maurice Eugene Heskett, all rights reserved.
More information about the Coco