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From: bart <bc@freeuk.com>
Newsgroups: comp.lang.c
Subject: Re: Which code style do you prefer the most?
Date: Mon, 3 Mar 2025 12:29:22 +0000
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On 03/03/2025 12:13, Michael S wrote:
> On Sun, 02 Mar 2025 13:17:12 -0800
> Tim Rentsch <tr.17687@z991.linuxsc.com> wrote:
> 
>> Michael S <already5chosen@yahoo.com> writes:
>>
>>> On Fri, 28 Feb 2025 00:29:29 +0000
>>> Richard Harnden <richard.nospam@gmail.invalid> wrote:
>> [...]
>>>> Computer terminals, back in the day, were basically square,
>>>
>>> My impression is that even in early days 5:4 was more common than
>>> square.
>>
>> Measuring an old VGA monitor, which is pretty close to an old
>> computer terminal, shows an aspect ratio of 3:2 (width:height).
>> Certainly not square.
>>
> 
> Are you sure that you measured viewing area?
> The references that I find on the net suggest 4:3 ratio for viewing
> area, which makes sense, considering 4:3 ratio of pixels in VGA's main
> graphics mode (64x480).
> 
> 240mm x 180mm for IBM 8512 color display
> 212mm x 155mm for IBM 8513 color display
> 283mm x 212mm for IBM 8514 color display

It depends on the aspect ratio of the pixels. But from I remember, in 
640x480 mode, they were square, so the aspect of the full-frame image, 
assuming no overscan, would be 4:3. The CRT physical aspect is harder to 
measure (some may be masked by the enclosure for example).

Domestic TV sizes in that era (40 years ago) were also 4:3, in the UK at 
least. And a lot of monitors would have been about the same.

(I was then developing graphics hardware with increasing resolution, but 
one problem was finding suitable monitors, with a finer shadow mask for 
colour, that could accommodate higher line and frame rates.

Wide-screen didn't start become popular until much later. I do remember 
massive monitors like ones with a 5:4 display, or 1280x1024, that I had 
to lug to trade shows.)