Specifications

Computer Architecture and Maintenance (G-Scheme-2014)

• Wait states:

• System board 1

• Adapter 1

Standard Feature

• ROM size 40KB or 64KB

• ROM shadowing No

• Optional math coprocessor 8087

• Coprocessor speed 4.77MHz

• Standard graphics None standard

• RS232C serial ports 1 (some models)

• UART chip used NS8250B

• Maximum speed (bits per second) 9,600bps

• Maximum number of ports supported 2

• Pointing device (mouse) ports None standard

• Parallel printer ports 1 (some models)

• Bidirectional No

• Maximum number of ports supported 3

• CMOS real-time clock (RTC) No

• CMOS RAM None

Expansion Slot

• Total adapter slots 8

• Number of long/short slots 6/2

• Number of 8-/16-/32-bit slots 8/0/0

• Available slots (with video) 4

Q.State Feature of AT mother Board

Ans. Every system unit for AT models has these major functional components:

■ Intel 80286 (6MHz or 8MHz) microprocessor

■ Socket for 80287 math coprocessor

■ Eight I/O expansion slots (six 16-bit, two 8-bit)

■ 256KB of Dynamic RAM (base model)

■ 512KB of Dynamic RAM (enhanced models)

■ ROM-based diagnostics (POST)

■ BASIC language interpreter in ROM

■ Hard/floppy disk controller

■ 1.2MB hard disk floppy drive

Prepared By – Prof. Manoj.kavedia (9860174297 – 9324258878 ) (www.kavediasir.yolasite.com)

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