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TRS-80 Model 4P. The Model 4P (September 1983, Radio Shack catalog number 26-1080) is a self-contained luggable unit. It has all the features of the desktop Model 4 except for the ability to add two outboard floppy disk drives and the interface for cassette tape storage (audio sent to the cassette port in Model III mode goes to the internal ...
A Tower Mounted Amplifier (TMA), or Mast Head Amplifier (MHA), is a low-noise amplifier (LNA) mounted as close as practical to the antenna in mobile masts or base transceiver stations. A TMA reduces the base transceiver station noise figure (NF) and therefore improves its overall sensitivity ; in other words the mobile mast is able to receive ...
The Model II was replaced in 1982 by the TRS-80 Model 12, which has half-height ("thinline") double-sided floppy drives, and integrates most of the Model II electronics into a single main board. [16] [17] The video and keyboard card plugged into a single slot in the main board. An expansion card cage was available as an option, allowing six ...
The Model 16 sold poorly at first and was reliant on existing Model II software early on. [9] In early 1983, Tandy switched from TRSDOS-16 to Xenix. [8] The Model 16 evolved into the Model 16B with 256 KB in July 1983, [10] and later the Tandy 6000, gaining an internal hard drive along the way and switching to an 8 MHz 68000. The 16B was the ...
Tandy/Radio Shack TRS-80 Model I. In the mid-1970s, Tandy Corporation's Radio Shack division was a successful American chain of more than 3,000 electronics stores. Among the Tandy employees who purchased a MITS Altair kit computer was buyer Don French, who began designing his own computer and showed it to the vice president of manufacturing John V. Roach, Tandy's former electronic data ...
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