Appendix

B. System address maps

 

 

 

 

 

 

 

 

Figure 35

(Page 2 of 2).

DMA I/O address map

 

 

 

 

 

 

 

 

 

 

 

Address (Hex)

 

Description

 

 

Bits

 

Byte pointer

 

 

 

 

 

 

 

00C8

 

Channel 6, Memory Address register

 

00–15

 

Yes

 

 

 

 

 

 

 

00CA

 

Channel 6, Transfer Count register

 

00–15

 

Yes

 

 

 

 

 

 

 

00CC

 

Channel 7, Memory Address register

 

00–15

 

Yes

 

 

 

 

 

 

 

00CE

 

Channel 7, Transfer Count register

 

00–15

 

Yes

 

 

 

 

 

 

00D0

 

Channels 4–7, Read Status/Write Command register00–07

 

 

 

 

 

 

 

 

 

00D2

 

Channels 4–7, Write Request register

00–02

 

 

 

 

 

 

 

 

 

00D4

 

Channels 4–7, Write Single Mask register bit

00–02

 

 

 

 

 

 

 

 

 

00D6

 

Channels 4–7, Mode register (write)

00–07

 

 

 

 

 

 

 

 

 

00D8

 

Channels 4–7, Clear byte pointer (write)

N/A

 

 

 

 

 

 

 

 

00DA

 

Channels 4–7, Master clear (write)/temp (read)00–07

 

 

 

 

 

 

 

 

 

00DC

 

Channels 4–7, Clear Mask register (write)

00–03

 

 

 

 

 

 

 

 

 

00DE

 

Channels 4–7, Write All Mask register bits

00–03

 

 

 

 

 

 

 

 

 

 

00DF

 

Channels 5–7, 8- or

16-bit mode select

00–07

 

 

 

 

 

 

 

 

 

 

PCI

configuration

space

map

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bus

number (hex)

 

Device

number

Function number

Description

 

 

 

 

 

(hex)

 

(hex)

 

 

 

 

 

 

 

 

 

 

 

00

 

 

00

 

00

Intel 82810-DC 100 Host bridge

 

 

 

 

 

 

 

 

00

 

 

01

 

00

Intel

84440BX VGA graphics

 

 

 

 

 

 

 

 

 

 

00

 

 

1E

 

00

Intel

82801

PCI–to–PCI

bridge

 

 

 

 

 

 

 

 

 

 

00

 

 

1F

 

00

Intel

82810

PCI–to–LPC

bridge

 

 

 

 

 

 

 

 

 

00

 

 

1F

 

1

IDE

controller

 

 

 

 

 

 

 

 

 

 

 

00

 

 

1F

 

2

USB

 

 

 

 

 

 

 

 

 

 

 

 

 

00

 

 

00

 

3

Intel

82801

SMBus

 

 

 

 

 

 

 

 

 

 

00

 

 

1F

 

5

Audio

multimedia

 

 

 

 

 

 

 

 

 

 

 

2 Upper byte of memory address register.

Appendix B. System address maps39

Page 47
Image 47
IBM 6278, 6288, 6268 manual Map, System address maps, Configuration

6278, 6268, 6288 specifications

The IBM 6278, 6288, and 6268 are part of IBM's extensive lineup of mid-range computers, specifically tailored for business environments in the late 1980s and early 1990s. These systems were designed to handle substantial data processing tasks, facilitating efficient business operations with robust performance and reliability.

The IBM 6278 was notable for its high-performance capabilities, making it suitable for a variety of applications ranging from transaction processing to complex computations. One of the main features of the 6278 was its multiprocessing capability, which allowed it to run multiple tasks concurrently. This was achieved through a combination of advanced hardware and software that optimized performance and resource allocation.

Similarly, the IBM 6288 was recognized for its versatility and scalability. This system incorporated enhanced memory management and was capable of handling larger workloads than its predecessors. The 6288 was designed with user-friendly interfaces and supported various input/output devices, making it easier for organizations to integrate into existing IT infrastructures. Additionally, it provided improved connectivity options, essential for modern networking needs at the time.

The IBM 6268, on the other hand, offered a balance between cost and performance, appealing to smaller businesses or those with less intensive data processing requirements. Despite being less powerful than the 6278 and 6288, the 6268 still managed to include essential features such as reliable data storage, effective processing speed, and compatibility with IBM's extensive software ecosystem.

All three models utilized IBM's proprietary operating systems, which were well-known for their robustness and security features. They were built with technologies such as error detection and correction, ensuring the integrity of data processing tasks. The architecture of these systems also allowed for easy upgrades, enabling businesses to expand their capabilities without a complete overhaul of their IT infrastructure.

In summary, the IBM 6278, 6288, and 6268 represented a significant advancement in mid-range computing technology during their era. Their main features encompassed multiprocessing, scalability, and user-friendly interfaces, making them valuable assets for businesses seeking reliable and efficient computing solutions. These systems laid the groundwork for future innovations in business computing, and despite their age, they remain a significant part of IBM's legacy in the computing industry.