Description - IBM 5170 Technical Reference

Description
The system board is approximately 30.5 by 33 centimeters (12 by
13 inches) and uses very large scale integration (VLSI)
~ technology.
It
has the following components:
• Intel 80286 Microprocessor
• System support function:
- 7-Channel Direct Memory Access (DMA)
- 16-level interrupt
- System clock
- Three programmable timers
• 64Kb read-only memory (ROM) subsystem, expandable to
128Kb
~
• Either a 256Kb or a 512Kb random-access memory (RAM)
Subsystem
• Speaker attachment
• Complementary metal oxide semiconductor (CMOS) memory
RAM to maintain system configuration
• Real-Time clock
• Battery backup for CMOS configuration table and Real-Time
Clock
• Keyboard attachment
• 8 input/output (I/O) slots:
- 6 with a 36- and a 62-pin card-edge socket.
- 2 with only the 62-pin card-edge socket.
System Board 1-3