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Questions tagged [commodore-pet]

Questions regarding the Commodore PET range of microcomputers.

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30 votes
5 answers
10k 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 ...
rwallace's user avatar
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21 votes
4 answers
2k views

Obscure uses of the Commodore 8050/1541 disk drive

When I was working for a foundry consultancy, we did the following Download routines to add delays when writing certain tracks. This was a security feature. When the program started, it would try ...
cup's user avatar
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49 votes
6 answers
7k views

Can a PET 2001 be physically damaged from BASIC?

In the early 1980s my primary school was the proud owner of a Commodore PET 2001. There was a commonly held belief among the young geek fraternity that there existed a BASIC command—perhaps a ...
Flup's user avatar
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17 votes
3 answers
3k views

C64/PETSCII block graphic symbol: was there ever a logical reason for their "ASCII" codes?

You know those block graphic symbols that allows you to draw lines, corners, intersections, fine bar charts, etc. they are useful and one can do a lot of stuff, but their code arrangements always ...
Gunther Schadow's user avatar
16 votes
2 answers
2k views

PET space arcade game with surprisingly good graphics

We had PET computers in my high school, 4032's IIRC, and a few classic games to go with them - the excellent Space Invaders port, Star Trek of course, and a few others. These all used PETASCII for ...
Maury Markowitz's user avatar
16 votes
1 answer
1k views

How did the Commodore PET 80 column display work?

Some variants of the Commodore PET (e.g. the 8000 and 9000 series, as well as some other versions with an aftermarket add-on) produce an 80x25 character display. Their character set is fixed in ROM ...
Jules's user avatar
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15 votes
2 answers
2k views

How should I repaint my Commodore PET?

I have an original Commodore PET from 1977, that I have recently electrically restored, but there are some rust spots on the case. It seems that I should at least do something to inhibit further ...
Edward's user avatar
  • 273
9 votes
3 answers
2k views

What's the first use of the term, "1977 Trinity"?

The term "1977 trinity" has been used, here on Retrocomputing SE and elsewhere, to refer to a set of three computers that started shipping in mid- to late-1977: the Apple II, the TRS-80 ...
cjs's user avatar
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9 votes
3 answers
555 views

Origin of dealer networks

Roughly speaking, the two main ways to sell computers are, and particularly were in the old days, Three digit price tag sold to individuals => mass market, department stores and suchlike. Four digit ...
rwallace's user avatar
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5 votes
1 answer
394 views

Were there any standard tricks to fix PET upper/lower case differences?

I have a Commodore PET 4016 like the one described here but did not grow up with any Commodore computers and I am still learning where it fits in their line-up and even how to use it. After buying a ...
natevw's user avatar
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5 votes
1 answer
755 views

What were Commodore's keyboard layouts before the VIC-20?

Starting in 1980 the VIC-20 keyboard seems to have become sort of a standard for Commmodore, being re-used on the MAX Machine (in membrane form), C64, C16 and (with additional keys added) the 128. ...
cjs's user avatar
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