Specifications

Computer Architecture and Maintenance (G-Scheme-2014)
■ 20MB or 30MB hard disk drive (enhanced models)
■ Serial/parallel interface (enhanced models)
■ CMOS clock-calendar and configuration with battery backup
■ Keylock
■ 84-key keyboard or 101-key Enhanced keyboard (standard on newer models)
■ Switchable worldwide power supply
System Architecture
• Microprocessor 80286
• Clock speed 6MHz or 8MHz
• Bus type ISA (Industry Standard Architecture)
• Bus width 16-bit
• Interrupt levels 16 (11 usable)
• Type Edge-triggered
• Shareable No
• DMA channels 8 (7 usable)
• Bus masters supported Yes
• Upgradeable processor complex No
Memory Architecture
 Standard on system board 512KB
 Maximum on system board 512KB
 Maximum total memory 16MB
 Memory speed (ns) and type 150ns Dynamic RAM chips
 System board memory-socket type 16-pin DIP
 Number of memory-module sockets 18 or 36 (2 or 4 banks of 18)
 Memory used on system board 36 128KB ×1-bit DRAM chips in 2 banks of
18, or
 18 256KB ×1-bit chips in one bank
 Memory cache controller No
 Wait states:
 System board 1
 Adapter 1
Standard Features
 ROM size 64KB
 ROM shadowing No
 Optional math coprocessor 80287
Prepared By – Prof. Manoj.kavedia (9860174297 – 9324258878 ) (www.kavediasir.yolasite.com)
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