Exabyte EXB-8505 8mm manual Servo Card SSV

1 Features

The drum rotates constantly at 1831 rpm in the default format (8500c format for the EXB-8505 and EXB-8505XL; 8200c format for the EXB-8205 and EXB-8205XL). This speed of rotation results in a nominal effective head-to-tape speed of approximately 150.5 inches per second (3.8 meters per second). Approximate tape movement is

0.5inches per second (11.1 millimeters per second). Forces acting on the tape and various component mechanisms are correspondingly low, resulting in long life for both the media and tape transport mechanism.

Note: In 8200 format, the drum rotates at 1923 rpm.

Servo Card (SSV)

The Servo (SSV) card contains the tape drive’s servo circuits, including two digital LSIs and one analog LSI, a dedicated 6303-compatible microprocessor, and a 64-KByte FEPROM.

The Servo card controls all the mechanics of the tape drive, such as the following:

Tape transport mechanism

Adjustment of tape velocity based on track-embedded servo information

Drum, reel, and capstan servos

Circuits that control the reel motor, the load motor, the drum and capstan motors, and the front load motor

Sensor interface circuits for the drum, reel, and capstan, tachometers

Sensor interface circuits for the load and mode states

Sensor interface circuits for detecting physical beginning of tape (PBOT), physical end of tape (PEOT), tape length and type, and write protect and cartridge load states

May 1994	EXB-8205 and EXB-8505	1-15
	(Standard and XL)