DIGITAL-LOGIC Microspace MSB900L User Manual page 33

DIGITAL-LOGIC AG
CMOS Map
continued...
Location Description
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 - 2Ah Custom Drive Table 1
These 6 Bytes (48 bits) contain the following data:
Cylinders
Landing Zone
Write Precompensation
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
Byte 3
28h
Bits 7-6 = Reserved
Bits 5-0 = Upper 6 bits of Write Precompensation
Byte 4
29h
Bits 7-0 = Number of Heads
Byte 5
2Ah
Bits 7-0 = Sectors Per Track
2Bh Boot Password
Bit 7
Bits 6-0 = Calculated Password
2Ch SCU Password
Bit 7
Bits 6-0 = Calculated Password
2Dh Reserved
2Eh High Byte of Checksum - Locations 10h to 2Dh
2Fh Low Byte of Checksum - Locations 10h to 2Dh
30h Extended RAM (kB) detected by POST - Low Byte
31h Extended RAM (kB) detected by POST - High Byte
32h BCD Value for Century
Continued...
10bits
10bits
10bits
08bits
08bits
= Enable/Disable Password
0 = Disable Password
1 = Enable Password
= Enable/Disable Password
0 = Disable Password
1 = Enable Password
MSB900/L Detailed Technical Manual V1.0
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