DIGITAL-LOGIC AG

 

MSB900/L Detailed Technical Manual V1.0

 

I/O Map

Continued…

 

 

 

 

 

 

 

 

 

 

I/O Addr.

Function

Size

R/W

Comment

 

 

 

 

 

 

 

0CCh

Master DMA Address - Channel 7

8bit

Yes

16bit values in two transfers.

 

 

 

 

 

 

 

0CDh

No Specific Usage

8bit

---

 

 

0CEh

Master DMA Counter - Channel 7

8bit

Yes

16bit values in two transfers.

 

 

 

 

 

 

 

0CFh

No Specific Usage

8bit

---

 

 

 

 

 

 

 

 

0D0h

Master DMA Command/Status – Channels [7:4]

8bit

Shw$

 

 

0D1h

No Specific Usage

8bit

---

 

 

 

 

 

 

 

 

0D2h

Master DMA Request - Channels [7:4]

8bit

WO

 

 

 

 

 

 

 

 

0D3h

No Specific Usage

8bit

---

 

 

0D4h

Master DMA Mask - Channels [7:4]

8bit

Yes

 

 

 

 

 

 

 

 

0D5h

No Specific Usage

8bit

---

 

 

 

 

 

 

 

 

0D6h

Master DMA Mode - Channels [7:4]

8bit

Shw@

 

 

0D7h

No Specific Usage

8bit

---

 

 

 

 

 

 

 

 

0D8h

Master DMA Clear Pointer - Channels [7:4]

8bit

WO

 

 

 

 

 

 

 

 

0D9h

No Specific Usage

8bit

---

 

 

0DAh

Master DMA Reset - Channels [7:4]

8bit

WO

 

 

 

 

 

 

 

 

0DBh

No Specific Usage

8bit

---

 

 

 

 

 

 

 

 

0DCh

Master DMA Reset Mask - Channels [7:4]

8bit

WO

 

 

0DDh

No Specific Usage

8bit

---

 

 

 

 

 

 

 

 

0DEh

Master DMA General Mask - Channels [7:4]

8bit

Shw@

 

 

 

 

 

 

 

 

0DFh

No Specific Usage

8bit

---

 

 

0E0h-2E7h

No Specific Usage

---

---

 

 

 

 

 

 

 

 

 

 

 

 

MSR bit enables/disables into I/O

 

 

 

 

 

2EFh space. (UART1 MSR

 

2E8h-2EFh

UART/IR - COM4

8bit

---

51400014h[18:16], UART2 MSR

 

 

 

 

 

51400014h[22:20]). Defaults to

 

 

 

 

 

LPC.

 

 

 

 

 

 

 

2F0h-2F7h

No Specific Usage

---

---

 

 

 

 

 

 

MSR bit enables/disables into I/O

 

 

 

 

 

2FFh space. (UART1 MSR

 

2F8h-2FFh

UART/IR - COM2

8bit

---

51400014h[18:16], UART2 MSR

 

 

 

 

 

51400014h[22:20]). Defaults to

 

 

 

 

 

LPC.

 

 

 

 

 

 

 

300h- 36Fh

No Specific Usage

---

---

 

 

 

 

 

 

 

 

370h

Floppy Status R A

8bit

RO

Second Floppy.

 

371h

Floppy Status R B

8bit

RO

Second Floppy.

 

 

 

 

 

 

 

372h

Floppy Digital Out

8bit

Shw@

Second Floppy.

 

 

 

 

 

 

 

373h

No Specific Usage

8bit

---

 

 

374h

Floppy Cntrl Status

8bit

RO

Second Floppy.

 

 

 

 

 

 

 

375h

Floppy Data

8bit

Yes

Second Floppy.

 

 

 

 

 

 

 

376h

No Specific Usage

8bit

---

 

 

377h

Floppy Conf Reg

8bit

Shw$

Second Floppy.

 

 

 

 

 

 

 

378h-3E7h

No Specific Usage

---

---

 

 

 

 

 

 

 

 

 

 

 

 

MSR bit enables/disables into I/O

 

 

 

 

 

3EFh space. (UART1 MSR

 

3E8h-3EFh

UART/IR - COM3

8bit

---

51400014h[18:16], UART2 MSR

 

 

 

 

 

51400014h[22:20]). Defaults to

 

 

 

 

 

LPC.

 

 

 

 

 

 

 

3F0h

Floppy Status R A

8bit

RO

First Floppy.

 

 

 

 

 

 

 

Continued…

 

 

 

 

 

38

Page 38
Image 38
Compaq MSB900L user manual MSB900/L Detailed Technical Manual Map, Lpc

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.