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Computer Summaries
Computer Architecture

Computer Block Diagram

PC Schematic

by Vaughn Aubuchon

Here is a brief summary computer block diagram of a typical Personal Computer.


The von Neumann (CISC) architecture employs a single bus. CISC stands for Complex Instruction Set Computer. A single-bus system is illustrated.
The Harvard (RISC) architecture utilizes two busses - a data bus and a separate address bus. RISC stands for Reduced Instruction Set Computer.

Relationships are shown between the CPU, DRAM, local bus, and the peripherals which connect to the motherboard. The ISA bus, SCSI Bus, PCI bus and USB Bus are shown. Some typical computer parameters are given, along with a Graphics Resolution chart.


Personal Computer Block Diagram

Primary Personal Computer Hardware
Block Diagram Components
in the PC shown above:

Mother board PC components: CPU, Math Co-processor, SRAM cache, DRAM, Video RAM, BIOS ROM, PCI Bridge
Peripherals: Monitor, Keyboard, Mouse, EISA Hard Drive, Floppy Disk, CD ROM, printer, scanner, USB drive


Later intel PC architectures
incorporate a 3-chip chipset,
consisting of -

CPU - Central Processing Unit
Northbridge - Connects CPU with DRAM, S-RAM cache, video RAM and Southbridge
Southbridge - Connects peripherals to the Northbridge chip

Screen Graphics
Resolution Table

(w x h)


640 x 480


1024 x 768

iMac (WXGA)

1280 x 720


1280 x 1024

iMac (HD+)

1600 x 900


1600 x 1280

iMac (FHD)

1920 x 1080

iMac (QWXGA)

2048 x 1152

iMac (QHD)

2560 x 1440

Wikipedia Display Resolution List

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Tags: pc block diagram, pc hardware architecture

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This Vaughns Personal Computer Block
Diagram was last updated on 2020-01-31.