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5)
Receive (REQ!ACK cycle) 1 message byte (See Section 4.2).
6)
Check status byte.
If Busy bit set,
resend command;
if
Check bit set, send REQUEST SENSE (03 H ) command to get error.
3.7
FORMATTING WITH THE ACB-5500
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A sample MODE SELECT command for a Seagate ST412-type drive is
described below:
Step 1:
MODE SELECT Command
Drive Type: Seagate ST412:
306 cylinders
4 heads
28 uS step rate
Reduced write current at cylinder 256
write precompensation at cylinder 256
Hex
Description
MODE SELECT Command
15
OP Code (ISH) for MODE SELECT
00
Formatting Lun0
00
Reserved
00
Reserved
16
Number of data bytes appended (16 H )
00
Reserved
Extent Descriptor List
00
Reserved
00
Reserved
08
Length of drive descriptor list
00
Density code
00
Reserved
00
Reserved
00
Reserved
00
High byte of block size to be formatted (256 bytes)
01
Middle byte of block size to be formatted
00
Low byte of block size to be formatted
01
01
02
32
04
01
00
01
00
00
01
500504-00
Drive Parameter List
Interface code (must be 01)
High byte of cylinder count
Hard sector drive or removable cartridge
Low byte of cylinder count
Total number of heads
High byte of reduced write current cylinder
Low byte of reduced write current cylinder
High byte of write precompensation cylinder
Low byte of write precompensation cylinder
Landing zone position (see STOP, IB H , command)
Head step rate (02-12 us, 01=28us, 00=3Ms)
3-7
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