Re: CADR 2 disk

[H@MIT-AI]

The problem with the disk was that the NRZ Data to the drive
was arriving just at the wrong moment, and the logic that
picks the write clock phase within the drive was making the
worng decision.  The Calcomp logic leaves something to be
desired.

Currently, the disk will only write if the Rd/Wr card is on
an extender.  The right fix is to put a 1/2 clock delay in the
disk control, and jumper select between 0, 1/2 delay when the
drive is setup.  I started to put this fix in but was diverted...