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On 03/03/2025 12:13, Michael S wrote:For home micros; Spectrums, BBCs, C64s etc, the TV was the monitor.On Sun, 02 Mar 2025 13:17:12 -0800It 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).
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
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.)
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