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Tandy Radio Shack

The TRS-80 model 4 (ref 26-1068/69) was one of the last models of the TRS-80 series (and perhaps the less known). It ran at 4 MHz and displayed 80 columns x 24 lines in Model 4 mode, but was fully compatible with the TRS-80 model 3 and in Model 3 mode actually displayed 64x16 and ran at the Model 3's 2 MHz.

It had 64 or 128 KB RAM, the 64 upper KB being used as a ram disk. It had one or two 5.25" floppy disk (184 KB each) and ran 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 (ref. 26-1070). The only difference being double sided drives -384 KB, instead of single sided drives.

A portable version of the Model IV called Model 4P (ref. 26-1080) was also marketed few time after.


Dwight Briney specifies:
A graphics adapter was also available for the Radio Shack TRS-80 Model IV in 1983. It came with a graphics programming language (BASICG). I used BASICG to program a basketball shot chart program that was used for a few seasons until I finally converted it to the IBM compatible Hercules graphics adaptor that had higher resolution.
It all seems pretty primitive now, but it worked great at the time.

Special thanks to Charles Harris who donated us this computer !

MANUFACTURER  Tandy Radio Shack
TYPE  Professional Computer
YEAR  1983
KEYBOARD  Typewriter style 83 keys with numeric keypad
CPU  Zilog Z80
RAM  64 KB (up to 128 KB)
ROM  14 KB
TEXT MODES  64 x 16 / 32 x 16 / 64 x 40 / 80 x 24
COLORS  Monochrome green phosphore
SOUND  Built-in speaker
SIZE / WEIGHT  47.5 (W) x 52 (D) x 31 (H) cm
I/O PORTS  Tape (500 or 1500 bauds), Centronics, I/O ports compatible with Model III, Serial (4D)
BUILT IN MEDIA  One or Two 5.25'' disk-drives
OS  TRSDOS 6.0 or 1.3, LDOS, CP/M
POWER SUPPLY  Built-in power supply unit
PRICE  From $1990. In later years the price came down to about $1000
By 1990 the Model 4D was being closed out at $599

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