10

[notebook page] 6

[printout taped to page]
CORE PARITY ERROR, LOCATION INDETERMINATE
PC = 340000004506 INSTR = 402000001134
DATE = 000641046230 TIME = 1020:35 M. H. H.[handwritten]
[end of printout]

9 JAN 68 - - 0700

CHASED 533 BUG (SEE PREVIOUS PAGE)
FOR MANY HOURS. OCCURS ONLY IN CORE
3 LOC'S WITH X-SELECT 120-137 (121, 122, 131, 132)
REPLACED OR SWAPPED ALL CONCEIVABLE
RELEVANT MODULES (EVEN CMA BITS).
NO CHANGE.

MYSTERY !

LOOK!
A STRAW! [arrow point to:] THEORY: MAYBE DRIVE CURRENTS ARE
JUST OUT OF TUNE. TRY THOROUGH TWEAKING.

D.W.P & P[super]2

Jan 9, 1968 10:30
Trouble with DTA7 & DTA4 -SEE BELOW,

[printout taped to page]
. CORE 24

.R LISPXY 24
?TRANSMISSION ERROR
[up arrow]C

.R LISPXY 24
?TRANSMISSION ERROR
[up arrow]C
. RUN DTA7 LISPXY 24

ALLOC?
[end printout]