On Tue, Jun 01, 2004 at 04:41:49PM -0700, Tom Jennings wrote:
  On Tue, 2004-06-01 at 14:00, Gene Buckle wrote:
  I had one of those when I was in high school.  It
was a Terminet 300 and
 didn't have any keyboard attached to it.  Right after I got it (in trade
 for a wrecked R/C helicopter of all things), I loaned it to a friend that
 discovered the hard way that Form Feed _really_ meant Feed All 2500 Sheets
 of Paper Out of The Box And On To The Floor.  He wasn't amused. :) 
 You merely needed to punch a new VFU tape on your paper tape punch.... 
That's like a great "bug" in bisync protocols - you could instruct the
printer to "skip to channel n", meaning do linefeeds until there was a
hole in the nth channel on the VFU tape.  By convention, channel 1 was
always punched to the top of form - issuing a "skip to channel 1" was
the HASP/3780 equivalent of an ASCII FF.
The bug is that the communication protocol allows your program to issue
a "skip to channel 0" command to the printer - but there _is_ no channel
zero on a 12-channel paper tape.  Newer devices treat channel 0 as if
it were channel 1.  Older, especially mechanical devices with real VFU
tapes, empty the box of paper, waiting for a non-existent channel to
respond.
-ethan
--
Ethan Dicks, A-130-S      Current South Pole Weather at 02-Jun-2004 01:30 Z
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