User`s manual

IOT - I/O Configure Disk Controller

3-104

The rate at which the read/write heads can be moved when

seeking a track on the disk. The encoding is as follows:

Single/Double DATA Density =D (S/D)?

Single/Double TRACK Density =D (S/D)?

The density (tracks per inch)

Single/Equal_in_all Track zero density =S (S/E)?

The data density of track 0, either a single density or equal to the

density of the remaining tracks. For Equal_in_all, the

Single/Double data density ßag indicates the density of track 0.

Slow/Fast Data Rate =S (S/F)?

The data rate for ßoppy disk devices

Step Rate

Code

(Hex)

Winchester

Hard Disks

3-1/2 and

5-1/4 Inch

Floppy

8-Inch

Floppy

00 0 msec 12 msec 6 msec

01 6 msec 6 msec 3 msec

02 10 msec 12 msec 6 msec

03 15 msec 20 msec 10 msec

04 20 msec 30 msec 15 msec

S Single (FM) data density

D Double (MFM) data density

S 48 TPI = Single Track Density

D 96 TPI = Double Track Density

S 250 kHz data rate

F 500 kHz data rate