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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).

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How to use the MOD operator in TRS-80 model 100 BASIC?

I'm finding the MOD operand is not working when I enter it in the BASIC prompt. This is how I write it out. PRINT 1 * MOD(23) ?SN Error I have looked into a reference guide and it is too broad on ...
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1answer
99 views

Decoding the Workings of the TRS-80 BASIC Game “Escape!”

I've decided to port Chase! to Swift, apparently because I am insane. In any event, I'm trying to collect the various switches in versions from the era. One of these is unique, found here under the ...
0
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1answer
146 views

Expanded Ram Options for the TRS-80 Model 100 possible into the megabyte range?

I have a trs-80 model 100. I have all the option rams used. I've seen some quite useful ideas from other collectors on the internet for other TRS-80 model computers of using mouser electronic parts to ...
6
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1answer
181 views

Would a replacement screen from a TRS-80 model 102 work for a model 100?

A few weeks earlier I have purchased an "as is" but working model 100 laptop. I've fixed some of the issues by soldering new capacitors for the screen, but the lines are still there. Would buying a ...
6
votes
1answer
242 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
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3answers
420 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
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1answer
208 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. ...
9
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4answers
595 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
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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
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3answers
420 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 ...
10
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2answers
434 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
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2answers
133 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
209 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 ...