26

at 0 isntead of 2277 as with
all the previous writes. Also, only one
sector is wiped out. Perhaps the disk
is not stopping the write soon enough?

Trying to write the last or next-to
last words of core onto the disk gives
non-ex mem from IOP. It appears,
however, that all the data gets transferred.

On backwards address testing,
bit 21 began dropping at BAND=
16+8+2+1 TRK=9.

With random data BIT 21 dropped
at BAND=128+8+4+2+1 TRACK = 1
SECTOR = 11+8+6+5+4+3+2 word q10.
likewise word 14. likewise word 15.
likewise word 17. ect. The effect is
repeatable. Happens with test #9 also.
Also with teset #1 (all 1 bits). Bit
21 of IOP SR flickers while writing.

John Sauter