B&B Electronics 3PXCC2a Manuale Utente

Documentation No.3PXCC1x-2x-3903

Appendix A: Hardware I/O A-1

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

Appendix A: Hardware I/O Map

I/O Map of XT Class Machines

Hex Address

Address Function in XT Class Machines

000-00F

DMA controller (8237A)

020-021

interrupt controller (8259A)

040-043

timer (8253)

060-063

PPI(8255A)

080-083

DMA page register (74LS612)

0A0-0AF

NMI - non maskable interrupt

200-20F

game port joystick controller

210-217

expansion unit

2E8-2EF

COM4 serial port

2F8-2FF

COM2 serial port

300-31F

prototype card

320-32F

hard disk

378-37F

parallel print

380-38F

SDLC

3B0-3BF

MDA - monochrome adapter and printer

3D0-3D7

CGA - color graphics adapter

3E8-3EF

COM3 serial port

3F0-3F7

floppy diskette controller

3F8-3FF

COM1 serial port

A-2

Appendix A: Hardware I/O

Documentation No.3PXCC1x-2x-3903

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

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.

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