Older computers with more than two speed (turbo) settings? \ VOGONS

Older computers with more than two speed (turbo) settings?

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First post, by Shponglefan

Posted on 2022-10-17, 02:33

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I was looking up the manual for the Epson Equity III+, a 286 based machine, and notice it mentions that these particular machines had a tri-select speed switch. This model could operate at 6, 8 or 12 MHz.

I know a lot of machines of that era typically had two speed settings, but I hadn't come across anything with triple settings. Does anyone know if there are other machines with multiple speed settings like that?

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Reply 1 of 4, by Grzyb

Posted on 2022-10-17, 02:47

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Commodore PC 10-III and 20-III can be switched between 4.77, 7.16, 9.54 MHz.

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Reply 2 of 4, by Horun

Posted on 2022-10-17, 02:57

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Interesting and thanks for the info !

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Reply 3 of 4, by Anonymous Coward

Posted on 2022-10-17, 04:11

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I think I've seen generic AT motherboards support multiple speeds as well, though they are toggled through the keyboard. Not sure what was actually happened though. Maybe it was just adding waitstates and disabling caches.

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Reply 4 of 4, by BitWrangler

Posted on 2022-10-17, 04:33

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Yah, I haven't come across it on a physical switch, but software turbo with 3 different speeds I've seen in faster 286 boards, like XT-ish speed, AT-ish speed and full speed. Can't remember what though, mostly "incidentally encountered" machines back in the day, nothing I know I've got.

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