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TABLE 2-2.
OFF LINE TESTER SWITCH FUNCTIONS (CONT' D)
Switch/Indicator
Mode Select
(Cont'd)
LOAD/SEQ HEADS
SWITCH
READ/ACCESS/WRITE
SWITCH
83318200
C
Mode'Select
Switch Position
OPPER
SECTOR
BEAD
SEQ REV
SEQ FWD
RANDOM
CONT
DIRE~T
LOAD
NEUTRAL
SEQ HEADS
READ
ACCESS
(NEUTRAL)
Function
Loads data pattern selected by INPUT swit
ches 32 through 1 when LOAD switch is
actuated.
Pattern is displayed by UPPER
PATTERN
indicators.
R/A
Selects head to be used for read/write oper-
ations (determined by INPUT switches
16
throuq'h
1)
when LOAD switch is actuated.
NOTE
The following switch positions,
except DIRECT, are under further
control of REPEAT/SINGLE switch.
For sequential forward or reverse
seeks, do not exceed lenq'ths
greater than 255 tracks.
Drive seeks in reverse until it reaches
cylinder 000; operation then stops.
De-
crement length selected by INPUT switches.
Drive seeks forward until it reaches cylin-
der
822
(or address is generated that would
exceed
822),
then performs direct seek to
cylinder 000.
Sequence repeats.
Increment
length selected by INPUT switches.
Drive continuously seeks forward or reverse
to random cylinder.
INPUT switches have no
effect.
Drive
~ontinuously
seeks from starting cyl-
inder to cylinder selected by INPUT switches.
Drive seeks once to cylinder selected by
INPUT switches.
Data selected by INPUT switches is loaded
in tester.
When mode select switch is in
UPPER or LOWER position.
Data selected by
INPUT switches is loaded into drive when
mode select switch is in HEAD position.
Data selected by INPUT switches is loaded
into drive.
No data loaded.
N/A
Drive reads selected track with selected
head after each seek.
Cylinder address
read from disk is displayed on logic chas-
s.is maintenance panel if its DISPLAY SELECT
switch is in ADDRESS VERIFY position.
If
error occurs on compare between address read
from disk and current cylinder address, ac-
cessing stops.
This may be verified by
setting DISPLAY SELECT to DSB4:
if Bit 8
is lit, (Address Error Fault) has been
detected by tester.
Reading and writing inhibited.
Only seeks
are enabled.
2-9
I
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