31 Mar
2010
31 Mar
'10
9:58 p.m.
On Apr 1, 2010, at 12:54 AM, Fred Cisin wrote:
Then the far edge of the card shows up at the wrong time, and the reader
generates a fault. Use to happen (rarely) with the IBM card readers.
Ahhhhhh I see. Can they re-feed, or would that be the operator's responsibility?
(I've never used a real IBM card reader)
-Dave
--
Dave McGuire
Port Charlotte, FL
The way my reader (A Documation
M200) does it is to move the card at constant speed using known-diamter
rollers, then to detect the leading edge of the card (basically when the
optical sensors g form all on to all off, then use that to produce an
internal clock signal that should align with the centres of the columns
(if you see what I mean) and us that to strobe the read logic.
What if the card slips?