badjohn
  • Member for 3 years, 11 months
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  • Warwickshire, United Kingdom
Why didn't early color TV sets accept RGB input?
21 votes

Early colour TVs predated VCRs and home computers by many years. Even if it did not cost much, adding an RGB input would still be a cost for something that no one would use. However, it would have ...

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What video connections were common in Europe?
21 votes

In the UK in the 1980s and the early 1990s, no video input at all was common. Early video recorders and set top boxes (for the new digital channels) would use RF out. You would disconnect the aerial ...

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What programming languages were most commonly used on the AS/400 in the 90s?
Accepted answer
14 votes

IBM i is actually the name of an operating system rather than the hardware. So, it is the successor to OS/400 rather than AS/400. The current hardware is IBM Power Systems. These can also run Aix ...

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Did many programs really store years as two characters (Y2K bug)?
8 votes

I worked with IBM minicomputers (S/36, S/38, and AS/400) in the 1980s and 1990s. The very ugly programming language RPG was popular. It looked very different from Cobol but had similar abilities. ...

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Any ways to have an architecture with a different base than base16?
5 votes

You have some good answers already but here is a specific example. The first computer that I used, back in 1974, was not in any way a base 16 system. The smallest addressable unit of memory was a 24 ...

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Which part of a computer does the conversion between binary to hexadecimal?
4 votes

Hexadecimal notation is not very significant to how computers work. It is primarily just a convenient, compact way to represent the bits in a byte. For example, if I wanted to specify the exact ...

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How did people use ed?
3 votes

If you are used to a modern editor then it is likely that using ed seems impossible but this applies to many modern items. How did people cope before they existed? You need to try to imagine that ...

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Why did F1 become the Help Key?
3 votes

In addition to the 3270 terminals described by Raffzahn, there were also the 5250 range. These were used by IBM's midrange systems: S/34, S/36, S/38, and AS/400. The AS/400 lives on today but has ...

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What was the last release of OS/400 to support CISC hardware?
2 votes

There was a little overlap of CISC and RISC. V3R6 was the first release to support RISC and had similar function to the CISC release V3R1. This was followed by V3R2 for CISC and V3R7 for RISC. From ...

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Understanding INKEY$ in ZX BASIC
1 votes

Raffzahn's answer is excellent and deserves to be the accepted answer but I would like to add another viewpoint. It only appears to be impossible for the program to get to line 30 because of an ...

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