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MSB900/L Detailed Technical Manual V1.0

CMOS Map continued...

Location

 

Description

 

 

 

 

 

 

 

15h

 

Base Memory Size (in kB) - Low Byte

 

 

 

 

 

16h

 

Base Memory Size (in kB) - High Byte

 

 

 

 

17h

 

Extended Memory Size (in kB) - Low Byte

 

 

 

18h

 

Extended Memory Size (in kB) - High Byte

 

 

 

 

19h

 

Extended Drive Type - Hard Drive 0

 

 

 

 

 

1Ah

 

Extended Drive Type - Hard Drive 1

 

 

 

 

 

1Bh

 

Custom and Fixed (Hard) Drive Flags

 

 

 

Bits 7-6

= Reserved

 

 

 

 

Bit 5

= Internal Floppy Disk Controller

 

 

 

0

=

Disabled

 

 

 

 

1

=

Enabled

 

 

 

Bit 4

= Internal IDE Controller

 

 

 

 

0

=

Disabled

 

 

 

 

1

=

Enabled

 

 

 

Bit 3

= Hard Drive 0 Custom Flag

 

 

 

 

0

=

Disabled

 

 

 

 

1

=

Enabled

 

 

 

Bit 2

= Hard Drive 0 IDE Flag

 

 

 

 

0

=

Disabled

 

 

 

 

1

=

Enabled

 

 

 

Bit 1

= Hard Drive 1 Custom Flag

 

 

 

 

0

=

Disabled

 

 

 

 

1

=

Enabled

 

 

 

Bit 0

= Hard Drive 1 IDE Flag

 

 

 

 

0

=

Disabled

 

 

 

 

1

=

Enabled

 

 

 

 

 

 

 

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

 

10bits

range 0-1023

 

 

Landing Zone

 

10bits

range 0-1023

 

 

Write Precompensation

10bits

range 0-1023

 

 

Heads

 

 

8bits

range 0-15

 

 

Sectors/Track

 

8bits

range 0-254

 

 

 

 

 

 

 

 

 

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

Continued...

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Image 32
Compaq MSB900L user manual Bit = Internal IDE Controller

MSB900, MSB900L specifications

The Compaq MSB900 and MSB900L are noteworthy entries in the realm of personal computing, particularly for their cutting-edge features and innovative technologies that defined their era. Positioned as versatile desktop solutions, both models have garnered attention for their robust performance and user-friendly design.

The Compaq MSB900 is equipped with a powerful processor that enhances multitasking efficiency. Its architecture supports a range of demanding applications, making it suitable for both professional and everyday use. Users can expect a seamless experience whether working on complex spreadsheets or engaging in casual gaming.

In terms of memory, the MSB900 boasts expandable RAM options, allowing users to enhance their system's capabilities as needed. The availability of multiple RAM slots provides flexibility for upgrades, ensuring the system can keep pace with future software requirements. Storage solutions in the MSB900 include high-speed hard drives, which contribute to fast boot times and robust data retrieval.

The MSB900L variant steps up the performance with additional features tailored for power users. It incorporates advanced graphics capabilities, offering superior visual experiences for gaming and multimedia applications. The dedicated graphics card provides a substantial boost in rendering performance, making it a worthy choice for graphic designers and video editors.

One of the standout characteristics of the MSB900 and MSB900L is their commitment to connectivity. Both models come equipped with a wide array of ports, ensuring compatibility with various peripherals. This includes USB ports for modern devices, Ethernet ports for wired networking, and legacy connections for older technology, catering to a diverse user base.

Energy efficiency is another key feature of these models. Designed with power-saving technologies, the Compaq MSB900 and MSB900L aim to reduce energy consumption without compromising performance. This focus not only helps to lower operating costs but also aligns with growing consumer preferences for environmentally conscious products.

In summary, the Compaq MSB900 and MSB900L offer a compelling combination of performance, expandability, and connectivity. Their innovative features and user-friendly design make them suitable for a wide range of users, from casual consumers to professional power users. As a testament to Compaq’s legacy, these models continue to be regarded as reliable choices in the personal computing landscape.