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SECTION 1 INTRODUCTION

The powerful FD 1791-01 Formatter/Controller is used to

encode and decode all data transfers to and from the disk

drives. It also provides for the generation and checking of

address marks, data marks, and the cyclic redundancy characters.

Write precompensation can be selected under software control at

three levels of intensity, providing flexible data recording.

Data separation is achieved by the use of a phase-locked loop to

insure maximum immunity to disk speed variation and to enhance

data recovery margins in both single and double density.

1.3 DEVICE SPECIFICATION

Power requirements: +7 TO +11 Volts 0.90 Amp. Typical

1.50 Amp. Maximum

+14.5 to +21.5 volts 25 Ma. Typical

50 Ma. Maximum

-14.5 to -21.5 volts 8 Ma. Typical

30 Ma. Maximum

System Port

Requirement:

One I/O port,

switch selectable 40,41,42,43 Hex

System Memory

Requirement:

1K Byte block

switch selectable

EOOO,E400,EPOO,ECOO,

FOOO,F400,FAOO,FCOO Hex

Recording Method: Single density in FM

Double density in MFM

External

Communication:

One EIA compatible input signal

One EIA compatible output signal

Disk Interface,

Connectors:

8" Drives

50 Pin Card Edge Connector

AMP P/N 888083-1

3M P/N 3415-0001

5" Drives 34 Pin Card Edge Connector

AMP P/N 583717-5

3M P/N 3463-0001

System Interrupts: Optional Feature,

Vector Interrupt on VIO* thru VI7*

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 46 47

Double D 1
. ERRATIC DISK OPERATION 4

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