Commodore PC-20

The Commodore PC-20 paired the PC-10 architecture with a factory hard disk for more capable business use.

It provided a clear step up within Commodore’s early PC-compatible range without changing software compatibility.

Notable Features

• A factory hard disk distinguishes it from corresponding PC-10 configurations.
• Drive capacity and display adapter varied by production series.

Historical Significance

• It provided a clear step up within Commodore’s early PC-compatible range without changing software compatibility.

Collector’s Notes

• Model suffix, motherboard revision, supplied display adapter, drives and original Commodore keyboard should be documented.
• Memory, storage, displays and expansion hardware should be documented because configurations often changed during a system’s working life.

Specifications

Technical Information
Name	Commodore PC-20
Manufacturer	Commodore
Launched	Sunday, January 1, 1984
Discontinued	1990s
Country	West Germany
CPU	Intel 8088 at 4.77 MHz
Units Sold
Form Factor	Desktop PC-compatible computer
Power	Internal mains supply or battery/adapter for portable models
Networking	Optional modem, serial networking and Ethernet or Token Ring adapters
Operating System	Commodore MS-DOS and compatible PC operating systems
Expansion / I/O	ISA expansion, serial, parallel, video and storage interfaces; exact complement varies
Keyboard	Detached PC-style keyboard
Storage	5.25-inch floppy plus factory hard disk, commonly 10MB or 20MB
Sound	PC speaker; optional sound cards
Colours	Adapter-dependent colour
Graphics	Monochrome or CGA-compatible graphics
Display	External monochrome or colour monitor
ROM	IBM-compatible BIOS ROM
RAM	256KB–640KB
CPU Speed	4.77 MHz