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MSB900/L Detailed Technical Manual V1.0

I/O Map

Continued…

 

 

 

 

 

 

 

 

 

I/O Addr.

Function

Size

R/W

Comment

 

 

 

 

 

 

 

 

 

If KEL Memory Offset 100h[0] = 1(Emulation-

 

 

 

 

Enabled bit).

060h

Keyboard/Mouse - Data Port

8bit

Yes

 

 

If MSR 5140001Fh[0] = 1 (SNOOP bit) and

 

 

 

 

 

 

 

 

KEL Memory Offset 100h[0] = 0 (Emulation-

 

 

 

 

Enabled bit).

061h

Port B Control

8bit

Yes

 

 

 

 

 

 

 

 

062h-063h

No Specific Usage

---

---

 

 

 

 

 

 

If KEL Memory Offset 100h[0] = 1

 

 

 

 

(Emulation-Enabled bit).

064h

Keyboard/Mouse - Command/ Status

8bit

Yes

.

 

 

 

 

 

If MSR 5140001Fh[0] = 1 (SNOOP

 

 

 

 

bit) and KEL Memory Offset 100h[0]

 

 

 

 

= 0 (Emulation-Enabled bit)

065h-06Fh

No Specific Usage

---

---

 

 

070h-071h

RTC RAM Address/Data Port

8bit

Yes

Options per MSR 51400014h[0]. (Note 1)

 

 

 

 

 

072h-073h

High RTC RAM Address/Data Port

8bit

Yes

Options per MSR 51400014h[1].

 

 

 

 

 

 

074-077h

No Specific Usage

---

---

 

 

078h-07Fh

No Specific Usage

---

---

 

 

 

 

 

 

 

080h

Post Code Display

8bit

Rec

Write LPC and DMA. Read only DMA.

 

 

 

 

 

 

081h

DMA Channel 2 Low Page

 

 

Upper addr bits [23:16]. Write LPC and

082h

DMA Channel 3 Low Page

8bit

Rec

DMA. Read only DMA.

083h

DMA Channel 1 Low Page

 

 

 

 

 

 

 

 

 

 

 

084h-086h

No Specific Usage

8bit

Rec

Write LPC and DMA. Read only DMA.

087h

DMA Channel 0 Low Page

8bit

Rec

Upper addr bits [23:16]. Write LPC and DMA.

 

 

 

 

Read only DMA.

088h

No Specific Usage

8bit

Rec

Write LPC and DMA. Read only DMA.

089h

DMA Channel 6 Low Page

 

 

Upper addr bits [23:16]. Write LPC and DMA.

 

 

8bit

Rec

08Ah

DMA Channel 7 Low Page

Read only DMA.

08B

DMA Channel 5 Low Page

 

 

 

 

 

 

08Ch-08Dh

No Specific Usage

8bit

Rec

Write LPC and DMA. Read only

 

 

 

 

 

 

08Eh

DMA

 

 

 

 

 

 

 

 

 

08Fh

DMA C4 Low Page

8bit

Rec

Upper addr bits [23:16]. See comment at 080h.

090h-091h

No Specific Usage

---

---

 

 

 

 

 

 

 

092h

Port A

8bit

Yes

If kel_porta_en is enabled, then access Port A;

else access LPC.

 

 

 

 

093h-09Fh

No Specific Usage

---

---

 

 

 

 

 

 

 

 

0A0h

PIC Slave - Command/Status

8bit

Shw$

 

 

 

 

 

 

 

 

0A1h

PIC Slave - Command/Status

8bit

Shw$

 

 

0A2h-0BFh

No Specific Usage

8bit

---

 

 

 

 

 

 

 

0C0h

Master DMA Address - Channel 4

8bit

Yes

16bit values in two transfers.

 

 

 

 

 

 

0C1h

No Specific Usage

8bit

---

 

 

0C2h

Master DMA Counter - Channel 4

8bit

Yes

16bit values in two transfers.

 

 

 

 

 

 

0C3h

No Specific Usage

8bit

---

 

 

 

 

 

 

 

0C4h

Master DMA Address - Channel 5

8bit

Yes

16bit values in two transfers.

0C6h

Master DMA Counter - Channel 5

8bit

Yes

16bit values in two transfers.

 

 

 

 

 

 

0C7h

No Specific Usage

8bit

---

 

 

 

 

 

 

 

0C8h

Master DMA Address - Channel 6

8bit

Yes

16bit values in two transfers.

0CAh

Master DMA Counter - Channel 6

8bit

Yes

16bit values in two transfers.

 

 

 

 

 

 

0CBh

No Specific Usage

8bit

---

 

 

 

 

 

 

 

 

Continued…

 

 

 

 

 

37

Page 37
Image 37
Compaq MSB900L user manual If KEL Memory Offset 100h0 =

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.