The ONLY TRS-80 that used cassette tape was the Model I. The Model II had an 8" floppy drive, the Model III had 2 5.25" floppy drives. There WERE no "next gen Model IIIs", the Model I, II, III, and IV were all their own generation.
I bow to your superior knowlege sir! So, it must have been a model I (give me a break it was over 30 years ago) sorry for the alzhiemers moment.