Specifications

SECTION II
ELECTRICAL INTERFACE
2.1 INTRODUCTION
The interface of the SA810/860 Diskette Drive can be divided into two categories:
a. Signal
b.
Power
The following paragraphs provide the electrical definition for each line. See figure 2-1 for all interface connections.
2.2 SIGNAL INTERFACE
The signal interface consists of two categories:
a. Control
b. Data Transfer
All lines in the signal interface are digital in nature and either provide signals to the drive (input), or provide signals
to the host (output), via interface connector
Pl/ J1.
2.2.1 Input Lines
There are twelve signal input lines. Nine are standard and three are user installable options (refer to Section VII).
The input signals are of three types. those intended to be multiplexed
in a multiple drive system, those not intended
to be multiplexed.
and those which will perform the multiplexing.
The input signals which are intended to do the multiplexing are:
a. DRIVE SELECT 1
b. DRIVE SELECT 2
c. DRIVE SELECT 3
d. DRIVE SELECT
4
The input signals to be multiplexed are:
a. SIDE SELECT
b. DIRECTION SELECT
c. STEP
d. WRITE GATE
e. WRITE DATA
The input signals which are not multiplexed are:
a.
MOTOR ON (May be optionally multiplexed. Refer to paragraph 7.9.)
b. IN USE
c. EXTERNAL WRITE CURRENT SWITCH
2-1