I/O Map of AT Class Machines

 

 

Hex Address

Address Function in AT Class Machines

000-01F

DMA controller #1 (8237A-5)

020-03F

interrupt controller #1 (8259A)

040-05F

timer (8254)

060-06F

keyboard (8042)

070-07F

NMI - non maskable interrupt & CMOS RAM

080-09F

DMA page register (74LS612)

0A0-0BF

interrupt controller #2 (8259A)

0C0-0DF

DMA controller #2 (8237A)

0F0-0FF

80287 math coprocessor

1F0-1F8

hard disk

200-20F

game port joystick controller

258-25F

Intel Above Board

278-27F

parallel printer port 2

2E8-2EF

COM4 serial port

2F8-2FF

COM2 serial port

300-31F

prototype card

378-37F

parallel printer 1

380-38F

SDLC or bisync com 2

3A0-3AF

bisync com 1

3B0-3BF

MDA - monochrome adapter

3BC-3BE

parallel printer on monochrome adapter

3C0-3CF

EGA - reserved

3D0-3D7

CGA - color graphics adapter

3E8-3EF

COM 3 serial port

3F0-3F7

floppy diskette controller

3F8-3FF

COM1 serial port

Any eight-byte space not used by one of the devices listed in the table and not used by any other equipment in your system may be used for the serial port.

A-2

Appendix A: Hardware I/O

Documentation Number 232CCxx4502

B&B Electronics Mfg Co – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104 B&B Electronics Ltd – Westlink Comm. Pk – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445

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B&B Electronics 232CC2B, 232CC1B, 232CC2A, 232CC1A manual Map of AT Class Machines

232CC2A, 232CC1B, 232CC2B, 232CC1A specifications

B&B Electronics is renowned for its reliable and high-quality connectivity solutions, particularly in the realm of serial communication. Among its distinguished offerings are the 232CC2B, 232CC2A, 232CC1B, and 232CC1A devices. Each of these products serves distinct yet essential roles in converting RS-232 serial communication to RS-485 or RS-422 standards, making them invaluable in various industrial and commercial applications.

The 232CC2B and 232CC2A are both robust models designed for half-duplex and full-duplex communication, respectively. The 232CC2B offers superior protection with built-in surge suppression, ensuring that the data remains intact even in electrically noisy environments. This model supports up to 1 mile of data transmission, making it ideal for applications in large industrial settings. The 232CC2A, on the other hand, enables full-duplex communication, providing a continuous data stream that increases efficiency and reliability for intensive data applications.

In contrast, the 232CC1B and 232CC1A are more compact, low-cost alternatives tailored for simpler applications that require fewer features. The 232CC1B supports half-duplex communication, suitable for applications where data traffic is moderate. Its small footprint makes it ideal for projects where space is at a premium. Meanwhile, the 232CC1A is designed for full-duplex communication and maintains a reliable data connection while minimizing latency, which is essential for real-time data processing.

All four models utilize advanced isolation techniques to protect users and connected devices from electrical interference and potential damage. These devices are also equipped with LED indicators to provide real-time status updates of data transmission, allowing ease of monitoring and troubleshooting.

In summary, B&B Electronics’ 232CC2B, 232CC2A, 232CC1B, and 232CC1A products represent a comprehensive range of solutions for serial communication conversion. Their varying features and capabilities cater to diverse industrial needs, ensuring reliable communication across a multitude of applications. Whether for complex industrial automation setups or simple data logging tasks, these devices stand as a testament to B&B Electronics’ commitment to quality and performance in the field of connectivity solutions.