From: Jay Jaeger
Sent: Sunday, August 16, 2015 3:18 PM
On 8/16/2015 9:00 AM, Michael Thompson wrote:
> We did a lot more debugging on the TC12 LINCtape
controller.
Second gut hunch is that it would be hard to see how
the drive could
cause this UNLESS the TC12 uses one side of the redundant tape channels
in one direction, and the other side in the other direction.
Not possible. The *drive* wire-ORs the redundant channels, before the
data goes into (or after it comes out of) the controller. *That's* the
redundancy. When reading in the reverse direction, only the mark tracks
on a DECtape read the same way backwards as forwards; LINCtape uses a
different set of markers.
Rich
Rich Alderson
Vintage Computing Sr. Systems Engineer
Living Computer Museum
2245 1st Avenue S
Seattle, WA 98134
mailto:RichA at
LivingComputerMuseum.org
http://www.LivingComputerMuseum.org/