IBM 5-1/4" Diskette Drive Adapter Hardware Reference Manual page 22

FDC Constants (in hex)
N: 02
GPL Format: 05
SC: 08
GPLR/W:
2A
HUT:
F
HLT: 01
SRT: C
(6
ms track-to-track)
Drive Constants
Head Load 35 ms
Head Settle
15 ms
Motor Start 250 ms
Comments
• Head loads with drive select, wait HD load time before R/W.
• Following access, wait HD settle time before R/W.
• Drive motors should be off when not in use. Only A or Band
Cor D may run simultaneously. Wait motor start time before ,.,.-..,
R/W.
• Motor must be on for drive to be selected.
• Data errors can occur while using a home television as the
system display. Placing the TV too close to the diskette area
can cause this to occur. To correct the problem, move the TV
away from, or to the opposite side of the system unit.
18 Diskette Adapter