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TRS-80 Model 4

This article is about the TRS-80 Model 4s, successors to the Model III). For an overview of all computers using the TRS-80 and Tandy names, see List of TRS-80 and Tandy-branded computers.
TRS-80 Model 4
ManufacturerTandy Corporation
TypeHome and small business computer
Release dateApril 26, 1983 (1983-04-26)
Introductory price$1999 (64K, 2 floppy drives, RS-232C), $1699 (64K, 1 floppy drive, no RS-232C)[1]
DiscontinuedLate 1991 (Late 1991)[2]
Operating systemTRSDOS 6.2,[3] LS-DOS 6.3[4], TRSDOS 1.3, LDOS 5.3, CP/M 2.2 or 3.0
CPUZilog Z80A @ 4 MHz, 6+ MHz with Z80B / Z80H, or HD64180 / Z180
Memory64 KB or 128 KB, 1 MB plus with third-party upgrades
DisplayModel 4 mode: 24 rows, 80 or 40 columns, Model III mode: 16 rows, 64 or 32 columns, block graphics
Graphicsoptional 640 by 240 pixels for $249 extra
Soundbeeper
Backward
compatibility		TRS-80 Model III
PredecessorTRS-80 Model III
Successornone

The TRS-80 Model 4 is the last Z80-based home computer family by Radio Shack, sold from April 1983 through late 1991.

  1. ^ "1984 Radio Shack Computer Catalog RSC-10 page 18". radioshackcatalogs dot com. Tandy/Radio Shack. 1984. Retrieved November 25, 2022.
  2. ^ "1990 Radio Shack Computer Catalog RSC-21 page 34 (effective thru fall 1991)". radioshackcatalogs dot com. Tandy/Radio Shack. 1990. Retrieved November 25, 2022.
  3. ^ "1985 Radio Shack Computer Catalog RSC-12 page 28". radioshackcatalogs dot com. Tandy/Radio Shack. 1985. Retrieved November 25, 2022.
  4. ^ "LSI Delivers". 80 Micro (Advert). May 1987. p. 10. Retrieved October 22, 2019.

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