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echo: tech
to: Matt Mc_Carthy
from: Leonard Erickson
date: 2003-05-17 05:51:06
subject: Info on old Serial to parallel converter

-=> Quoting Matt Mc_Carthy to Leonard Erickson <=-

 MM> No help whatever on that one, but the post reminded me I built one
 MM> years ago, and made it switchable, as I needed a parallel to serial to
 MM> run an old Centronics serial printer (yes, the people that 'invented'
 MM> the parallel port!)  People thought I was nuts back then, as I had a
 MM> computer with only 16K and had a 64K buffer hanging from it.  Wonder
 MM> where it is now or what ever happened to it?  What would I do with it
 MM> if I knew where it was?   :-)) 

I've got two 64k printer buffers around here. I think I know where they
are. They don't like PC printer ports that much. they were wired for
Centronics ports. 

I used to save charges on Compuserve by calling in with my modem hooked
up to a Wyse terminal set for 132 columns, and dumping the messages to
a fast (for the time) wide carriage printer thru the buffer. I'd set
for 1432 column output from the forum, and no pauses between messages. 

At 2400 bps (or I might have been at 1200 back then) it saved me a
*lot*. It'd take a while to fill the buffer, and the printer was fast
enough that it only ran for another 10 minutes or so after I logged
off. 

Then I could read thru the message, write replies on my TRS-80 to be
uploaded later (and it was possible to make the replies a batch
upload). And anything I wanted to keep I could snip out and file.

Later, I switched to dumping to the disks in the M100 DVI unit, since I
could do that with a simple capture command. Reading the files got
"interesting" as the text editor was limited by the amount of RAM
available (less than 24k after the ROM and the DOS).

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