TRANSPORT STATUS (Circuit Card 1A2A1 )

TM 11-6625-3024-14/EE641-AC-MMA-010/E154 SYSEX/TO 33AA50-5-1-1

4-8. TRANSPORT STATUS (Circuit Card

following functions: WRITE, SELECTED, READY,

1A2A1 ) (See Figure FO-6)

IN REWIND, BOT (Beginning-Of-Tape), and EOT

(End-Of-Tape).

The status circuit receives status information

from the transport to light status indicators on the

4-9. DATA CONTROL (Circuit Card 1A2A2) (See

front panel of the Exerciser. (See Figure 4-7,

Transport Status Block Diagram.)

The Data Control circuits select the type of data

Transport status lines are received through

to be written on tape. (See Figure 4-8, Data Con-

buffers that convert the transport negative logic to

trol Block Diagram.)

the Exerciser positive logic levels. The outputs of

the buffers are applied to Lamp Drivers that

The Data Select switches are push-ON/

provide a return signal for the enabled status

push-OFF type switches. When a Data Switch is

indicator. The status indicators operate on +28

selected the switch latch is set. The outputs of the

Vdc.

latches are applied through open collector buffers

to lamp drivers. The lamp drivers provide a return

The status lines are also routed to the status

for the 28 Vdc indicator lamps.

selector on the processor circuit card. The

Exerciser indicates transport status for the

Figure 4-7. Transport Status Block Diagram

4-12