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Radio Shack TRS-80 Model 4P

See below for specifications and information on this system.

Specifications and information

Key Dates:  
Original Price:  
CPU: Zilog Z-80A
Memory: 64K RAM
Operating System: TRSDOS; CP/M
Input/Output: Built-in non-detachable but separate keyboard, 9" green monochrome monitor, dual floppy disk drives; serial port; external diskette drive port; parallel port
Resolution: Monochrome 128x48 graphics; 64x24 character display
Bus: TRS-80 Bus
Other Items in Collection: Quick Reference documentation; TRSDOS and CP/M system diskettes; complete Radio Shack service manual
Items Needed: Documentation

The TRS-80 Model 4P was a portable version of the Model 4. Both the Model 4 & 4P were 64K "flat" versions of the TRS-80 Model 3 ("flat" meant that a ROM BASIC did not break up the Z-80 processor's 64K address space; all 64K of RAM was available to programs). This meant that the machine could run either TRSDOS or the popular CP/M operating system. The Model 3 could run only TRSDOS. In turn, the Model 3 was a one-piece version of the TRS-80 Model 1. Got all of that?

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Last modified: April 17, 2003