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It could hold an additional three 8″ disk drives or up to four 8.4 MB hard drives (the Model II allowed three external floppy drives to be daisy-chained to it). In 1981, the 64K Model II computer was $3,350 and the "primary unit" 8.4 MB hard disk another $4,040 by mail-order from Radio Shack's dealer in Perry, Michigan ; MSRP in the company's ...
The two computers were often marketed by Tandy/Radio Shack as a complementary pair. A diskless Model 4 with 16KB RAM cost $999; with 64KB RAM and one single-sided 180K disk drive it cost $1699; with 64KB RAM and two drives it cost $1999. An upgrade for Model III owners cost $799 and provided a new motherboard and keyboard. [6]
The Model 100 line also had an optional bar code reader, serial/RS-232 floppy drive and a Cassette interface. Also available as an option to the Model 100 was an external expansion unit supporting video and a 5 1 ⁄ 4" disk drive, connected via the 40-pin expansion port in the bottom of the unit.
Radio Shack introduced a 5 MB external hard disk for the TRS-80 Model III/4 in 1983. It is the same hard disk unit offered for the Model II line, but came with OS software for Model III/4. An adapter is required to connect it to the Model I's E/I. [69] The unit is about the same size as a modern desktop computer enclosure. Up to four hard disks ...
An external floppy drive can be connected to a port on the back. The machine itself supplies power to the external drive, so only Tandy's floppy drive unit is usable with the EX and HX. The external drive is the standard 360 KB 5.25" format; in 1988 a 720 KB 3.5" model was offered.
A Disk/Video Interface expansion box was released in 1984, with one single-sided double-density 180 KB 5-1/4 inch disk drive and a CRT video adapter. This allows the Model 100 to display 40 or 80 column video on an external television set or video monitor. One empty drive bay permits the installation of a second disk drive. [12]