Bb-electronics PC Watchdog Timer Card ATRWDT Instrukcja Użytkownika Pobierz pdf (Strona 20)

Documentation Number ATxWDT-1303 Appendix A 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 Maps

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

1 2 ... 15 16 17 18 19 20 21 22 23

Brak uwag

Bb-electronics PC Watchdog Timer Card ATRWDT Instrukcja Użytkownika Strona 20