TRS 80 Model 4

TRS 80 Model 4 ( Model Number: 262-1069 ) - 01
	   
The TRS 80 model IV is one of the last model of the TRS 80 serie 
(and perhaps the less known). 
It is fully compatible with the TRS 80 model III (except its 80 columns). 

It has 128 kb RAM, the 64 upper KB being used as a ram disk. 
It has one or two 5.25" floppy disk (184k each) and runs under 
TRSDOS 6.0 or 1.3, LDOS or CP/M. 

A transformation kit "TRS80 model III -> model IV" was available. 

The Model 4 was followed by the Model 4D. 
The only difference being double sided drives, 
as opposed to single sided drives. 

A portable version of the Model IV called Model 4P was also marketed
few time after. 

(www.old-computers.com)
	   

Manufacturer Tandy Radio Shack Name TRS 80 Model 4
Type Professional Computer Origine USA
Introduction Date 1983 End of production ???
Built in Language ??? Keyboard Full-stroke keyboard with separated numeric keypad
CPU Zilog Z80 Speed 4 Mhz
Coprocessor ??? Amount of Ram 64 KB (up to 128 KB)
Vram ??? Rom 14 kb
Text Modes 64 x 16 / 32 x 16 / 64 x 40 / 80 x 24 Graphic Modes ???
Colors monochrom Sound ???
Size / Weight ??? Built in Media One or two 5.25" disk-drives
I/O Ports Tape (500 or 1500 bauds), Centronics, I/O ports compatible with Model III OS ???
Power Supply Internal Introduction Price ???
Sold ??? Serial Number 000321
Other Extras None Bought Where Brugge
Bought When March 25, 2002 Condition Good
Price Paid 30 Specs of my Model 2 Disk Drives
Setup Today ???

Bottom view Serial Number

	   
	   
TRS 80 Model 4-01:

Bought via an ad on the internet (Brugge) on 25/03/2002

Paid 30  for it ( 60  for TRS 80 model III & TRS 80 model 4)