Computer News 80

Open forum for users of the TRS-80 Model I/III/4 computers. Post questions, and answers. Post items for sale.

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Location: Casper, Wyoming, United States

Tuesday, July 20, 2004

What is the difference between Model 4 and Model 4D

Many have asked us "What is the difference between a Model 4 and a Model 4D.  The only difference is that the Model 4 D was the last TRS-80 Radio Shack manufactured so it will always have a green screen (green letters on a dark grey backgound. And it has double-sided double density full height disk drives that will hold 360K of storage space.
If you remove the black face plate you will find that the drives are half height. You can replace these original drives with any half height 5.25" double-density disk drive.
Adding double side drives to any Model 4 will give you a computer that is the same as a Model 4D 

Saturday, July 17, 2004

Visit the Computer New 80 Catalog Site

Need parts or software for you TRS-80 Model 4 or 3 check out our on line catalog at