DIGITAL-LOGIC Microspace MSM586SEN - Page 44

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