Specifications

TABLE 7·1. CUSTOMER CUT/ADD TRACE OPTIONS
TRACE
SHIPPED FROM FACTORY
DESIGNATOR
DESCRIPTION
OPEN
SHORT
U9
TERMINATIONS FOR MULTIPLEXED INPUTS
PLUGGED
SI
INTERNAL WRITE CURRENT SWITCH
PLUGGED
SE
EXTERNAL WRITE CURRENT SWITCH
X
TR
TRUE READY OUTPUT
PLUGGED
RTR
RADIAL TRUE READYt X
2S
TWO-SIDED STATUS OUTPUT***
X
DC
DISK CHANGE OPTION
X
S1
SIDE SELECT OPTION USING DIRECTION SELECT***
X
S2
SIDE SELECT INPUT* * * PLUGGED
S3
SIDE
SELECT OPTION USING DRIVE SELECT* * *
X
1 B,2B,3B,4B
SIDE SELECT OPTION USING DRIVE SELECT***
X
D
ALTERNATE
INPUT-IN USE
X
MS
MOTOR
ON FROM DRIVE SELECT* PLUGGED
MO
ALTERNATE INPUT-MOTOR ON* X
MMO
ALTERNATE INPUT-MULTIPLEXED MOTOR ON*t X
MD
MOTOR OFF DELAY
X
R
READY OUTPUT
X
RR
RADIAL READY
X
SR
STANDARD READYt
PLUGGED
MT
MODIFIED TRUE READYt
(OUTPUTS TRUE READY ON PIN 22) X
DS1
DRIVE SELECT 1 INPUT
PLUGGED
DS2,3,4
DRIVE SELECT 2,3,4 INPUT
X
Y DOOR LOCK/ACTIVITY LIGHT ACTIVATED FROM MOTOR ONt PLUGGED
z
DOOR LOCK/ACTIVITY LIGHT ACTIVATED FROM DRIVE SELECTt
X
PD
STEPPER POWER DOWN
X
WP
INHIBIT WRITE WHEN WRITE PROTECTED
X
NP
ALLOW WRITE WHEN WRITE PROTECTED
X
TS
DATA SEPARATION OPTION SELECT**
X
*MOTOR ON is the complement of HEAD LOAD on the SA801 and SA851 disk drives. The only difference in the
operation of MOTOR ON compared with HEAD LOAD is· that MOTOR ON requires a 165 ms minimum delay (or
TRUE READY
must be monitored) before RIW activity is begun. HEAD LOAD on the SA801 and SA851 requires 35
ms
or 50 ms minimum delay.
* *The
SA81 0/860 offers an optional data separator which properly separates data and clock bits thmugh the soft-
sectored IBM standard format and address mark area. Trace "TS" offers the optional separator.
* * * Applies
to SA860 only.
tAvailable on PCB PIN 25249 only.
7-2
39216-19-A