Chapter 1. System Description
System Features
The following figure lists the devices and features of the PC 100 and PC 300 system board. It also
includes some of the options that may be added to these computers.
Figure 1 (Page 1 of 2). System Board Devices, Features, and Options
Device
Features
Microprocessor
Intel Pentium (75/100/120/133 MHz)
2
32-bit address bus, 64-bit data bus
8 KB internal (L1) write-through code cache
8 KB internal (L1) write-back data cache
Superscalar architecture (two execution units)
Math coprocessor function included in the Pentium
Microprocessor is upgradable for future Intel microprocessor technology
External Cache (L2)
DIP sockets for user-installable data/tag RAMs
256 KB asynchronous write-back unified (code and data)
Video Subsystem
Cirrus Logic GD5436 SVGA video controller
Plug and Play monitor support (DDC2)
Advanced Power Management
Local peripheral bus (LPB) interface
64-bit data path width on PCI bus
Integrated DAC
64-bit graphics accelerator
1 MB of 70 ns FP DRAM
Fast Page Mode DRAM
Sockets for additional 1 MB
Bus Architecture
ISA/PCI-bus-compatible I/O expansion slots
Synchronous 25/30/33 MHz PCI bus
50/60/66 MHz processor bus
Integrated L2 cache controller
Flash ROM Subsystem
256 KB flash ROM for POST/BIOS
RAM Subsystem
8 MB standard DRAM, upgradable to 128 MB
70-ns fast page (FP) or 60-ns extended data output (EDO), non-parity, dynamic
random access memory (DRAM)
Four 72-pin SIMM sockets in two banks
SIMMs (4 MB, 8 MB, 16 MB, or 32 MB)
Matched pairs required in each bank
CMOS RAM Subsystem
128-byte CMOS RAM with real-time clock, calendar, and battery
ISA/PCI Bridge
ISA/PCI interface
PCI bus-master EIDE interface
ISA-compatible interrupt controller
ISA-compatible DMA controller
DMA Controller
Seven AT-compatible DMA channels
Four 8-bit channels
Three 16-bit channels
Interrupt Controller
15 levels of system interrupts
AT bus interrupts are edge triggered
PCI bus interrupts are level sensitive
System Timers
Channel 0–System timer
Channel 1–Refresh generation
Channel 2–Tone generation for speaker
Audio Subsystem
On-board Piezo electric beeper
2
MHz denotes internal clock speed of the microprocessor only; other factors might also affect application performance.
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Technical Information Manual
Summary of Contents for PC 100
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