Manual background

7

SCSI PACKETS

$20

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Address of 384-byte

 

 

 

SCSI RAM area

 

 

 

(MSW)

$22

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Address of 384-byte

 

 

 

SCSI RAM area

 

 

 

(LSW)

 

 

 

This SCSI RAM work

 

 

 

area cannot be

 

 

 

deallocated or moved

 

 

 

except after a detach

 

 

 

or reset command.

 

 

 

The firmware uses

 

 

 

this

 

 

 

area for the SCSI CDB

 

 

 

and local pointers

 

 

 

and variables.

$24

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Logical bytes per

 

 

 

block must be an

$26

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integer multiple of

 

 

 

physical bytes per

 

 

 

block and if track 0 is

 

 

 

half the density of the

 

 

 

rest of the disk, then

 

 

 

the sectors per track

 

 

 

field must be an even

 

 

 

value. This prevents

 

 

 

a

 

 

 

half sector overrun of

 

 

 

data.

$28

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Defines the number

 

 

 

of alternate sectors

 

 

 

per

zone to reserve for alternates. The zone can

be described as either a track or a cylinder,

as specified by bit 11 of the SCSI drive

7-16

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Image 96
Emerson MVME147 manual xxxxxxxx