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Questions tagged [trs-80]

Use for questions regarding the z80-based Tandy Radio Shack computers, the TRS-80 Model I, II, III, and 4. Computers using another processor, such as the 6809-based TRS-80 Color Computer, should use a different tag ([color-computer] in that case).

6
votes
1answer
213 views

How did the original TRS-80 generate video?

I'm curious how the original (Model 1) TRS-80 generated video. I understand that an RF modulator was used but what kind of circuitry did it use to feed the RF modulator? The TRS-80 Color Computer ...
5
votes
3answers
398 views

What to check before powering on TRS80 Model III in unknown condition [duplicate]

Having managed to source a TRS-80 Model III that I'm told hasn't been powered on for quite some time (and I suspect this is a massive understatement), I'm worried that the first thing that might ...
4
votes
1answer
149 views

Which DOS for a TRS-80 Model 4P?

Looking at the TRS-80 Disk Software Page, there's a rather extensive selection of DOS options that seem to work with the 4P and also claim high compatibility with the Tandy "TRSDOS" option. ...
8
votes
4answers
522 views

Columns of text in early microcomputers

As discussed in some previous questions here, 80-column text was established by IBM as the standard for business computing as early as the sixties, but monitors capable of displaying that resolution ...
29
votes
5answers
8k views

Why were early personal computer monitors not green?

Green was traditionally the most common color for computer monitors; it combines strain-free readability with low cost. Given this, it's surprising that the first versions of the Commodore PET and ...
6
votes
3answers
407 views

Origin of Dongles

The first time I ever heard of a dongle was when it was used on a text processor called Wordcraft on the Commodore 8032. It was around 1980. We had three machines and had to share the dongle amongst ...
9
votes
2answers
401 views

Who coined the nickname “Trash-80” and what was the source of their animosity?

In the U.S. in the early 1980's (1980-1982, roughly), the TRS-80 Model I/III computers were commonly referred to by teens and youngsters as the "Trash-80". The best reason I can attribute to this ...
4
votes
2answers
118 views

Was the TRS-80 Model 1 ever actually sold new with that name?

When Tandy introduced the TRS-80, the computer we know now as the "Model 1" or Model I" was simply called the TRS-80. No "Model" designation was necessary. The early releases were as follows: TRS-80, ...
6
votes
1answer
193 views

Did Radio Shack initially attempt to get a monopoly on commercial software for the TRS-80 Model I?

This question is about the era of the TRS-80 Model I, ca. 1977-1979. Originally there was no software you could buy, other than BASIC itself, which was in ROM. You would write your own, or type in ...
58
votes
5answers
13k views

Is it safe to turn on a 40-year old TRS-80?

My father is a retired programmer. When I was in high school in the late 1970s, he purchased a TRS-80 model 1 (on which I learned to program in BASIC). At some point in the early 1980s it, together ...