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Mode Select Parameter List: Page 5 Parameters (cont’d)
C (Note 6) Starting cylinder - reduced write
current (MSB)
D (Note 6) Starting cylinder - reduced write
current (LSB)
E (Note 7) Drive step rate (MSB)
F (Note 7) Drive step rate (LSB)
BYTE OFFSET
VALUE COMMENTS
10 00 Drive step pulse width
11 01 Head settle delay (MSB)
12 18 Head settle delay (LSB)
13 0C Motor on delay
14 64 Motor off delay
15 E0 Flags: TRDY = 1, SSN = 1, MO = 1
16 (Note 8) Steps per cylinder
17 02 Write precomp level
18 00 Head load delay
19 00 Head unload delay
1A (Note 9) Pin 34 definition/pin 2 definition
1B 00 Pin 4 definition/pin 1 definition
1C (Note 10) Reserved
1D (Note 10) Reserved
1E (Note 10) Reserved
1F (Note 10) Reserved
NOTES:
1. Transfer rate is $1F4 if the floppy data rate is 500k bits/sec.
Transfer rate is $FA if the floppy data rate is 250k bits/sec.
This is controlled by the 5"/8" flag (bit 3) in the attach packet
byte offset $10.
2. Number of heads is taken from the attach packet, byte offset
$07.
BYTE OFFSET
VALUE COMMENTS