DIGITAL-LOGIC Microspace MSM586SEN Technical User Manual page 44

DIGITAL-LOGIC AG
CMOS Map
Continued...
Location Description
1Ch Reserved
1Dh EMS Memory Size Low Byte
1Eh EMS Memory Size High Byte
1Fh – Custom Drive Table 0
24h
These 6 bytes (48 bits) contain the following data:
Cylinders
Landing Zone
Write Precomp
Heads
Sectors/Track
Byte 0
1Fh
bits 7-0 = Lower 8 Bits of Cylinders
Byte 1
20h
bits 7-2 = Lower 6 Bits of Landing Zone
bits 1-0 = Upper 2 Bits of Cylinders
Byte 2
21h
bits 7-4 = Lower 4 Bits of Write Precompensation
bits 3-0 = Upper 4 Bits of Landing Zone
Byte 3
22h
bits 7-6 = Reserved
bits 5-0 = Upper 6 Bits of Write Precompensation
Byte 4
23h
bits 7-0 = Number of Heads
Byte 5
24h
bits 7-0 = Sectors Per Track
25h – Custom Drive Table 1
2Ah
These 6 bytes (48 bits) contain the following data:
Cylinders
Landing Zone
Write Precomp
Heads
Sectors/Track
Byte 0
25h
bits 7-0 = Lower 8 Bits of Cylinders
Byte 1
26h
bits 7-2 = Lower 6 Bits of Landing Zone
bits 1-0 = Upper 2 Bits of Cylinders
Byte 2
27h
bits 7-4 = Lower 4 Bits of Write Precompensation
bits 3-0 = Upper 4 Bits of Landing Zone
Continued...
MSM586SEN/SEV Manual V1.5E
10 bits
10 bits
08 bits
10 bits
10 bits
08 bits
44