Tandy TRS-80 Model 4P

The Tandy TRS-80 Model 4P repackaged Model 4 compatibility and performance into a transportable case with a 9-inch display and two floppy drives. The keyboard clipped over the screen for travel.

Although heavy by later portable standards, the 4P gave existing TRS-80 users a self-contained system for work away from a fixed desk.

Notable Features

• Zilog Z80A at 4 MHz with 64KB standard; expandable to 128KB.
• The principal display was Built-in 9-inch green monochrome CRT; 80 x 24 text.
• Storage support consisted of Two built-in 5.25-inch floppy drives.

Historical Significance

• Although heavy by later portable standards, the 4P gave existing TRS-80 users a self-contained system for work away from a fixed desk.
• Radio Shack’s large retail network made demonstration, sales and support available well beyond specialist computer dealers.

Collector’s Notes

• Factory memory, drive configuration and regional badge should be checked because many surviving systems were upgraded.
• Original monitors, manuals, software, storage hardware and Radio Shack peripherals add historical context.

Specifications

Technical Information
Name	Tandy TRS-80 Model 4P
Manufacturer	Tandy
Launched	Thursday, September 1, 1983
Discontinued	1985
Launch Price	$1,799
Country	United States
CPU	Zilog Z80A at 4 MHz
Units Sold
CPU Speed	4 MHz
RAM	64KB standard; expandable to 128KB
ROM	Boot ROM with Model III compatibility loaded from disc
Display	Built-in 9-inch green monochrome CRT; 80 x 24 text
Graphics	128 x 48 block graphics; optional high-resolution graphics
Sound	Programmable beeper
Storage	Two built-in 5.25-inch floppy drives
Keyboard	Integrated keyboard forming the transport cover
I/O	Printer, serial, cassette and expansion interfaces
Operating System	TRSDOS 6 / LS-DOS; Model III compatibility loaded from disk