Fastest "Turbo XT"
People on the net always seem to forget that the 8086/NEC V30 were also around. :)
These were about twice as fast at same clockspeed.
Non-"castrated"* PC compatibles and Turbo XTs also existed.
Amstrad PC1512, Olivetti M24, Tandy 1000 SL etc.
Then, there used to be 80186 PCs around, too.
Siemens PCD-D, BBC Master 512.. All from the early 80s.
They all were rudimentary CGA and BIOS compatible, at least.
If external components were used, such as PIT, PIC etc, then better IBM PC compatibility was possible with 80186 systems.
And at 8 MHz, they were comparable to slow ATs, at least.
Ergo, the stickers on those old game boxes weren't lying, really.
Games running on 8086 PCs faster than 4,77 MHz were kind of playable.
Edit: Typos fixed.
Edit: This old thread/topic is an interesting read, too.
It covered the different duty cycles of Intel/NEC, for example:
Clock doubling circuit for Turbo XT's!
Edit: Here's an article of an 7.16 MHz overclock for the IBM PC 5150.
https://ctrl-alt-rees.com/2020-12-31-my-maxed … -doscember.html
https://www.youtube.com/watch?v=Y7NNCWvt1nY
(*Sounds slightly offensive, maybe, but that's how an Intel developer called the 8088 in the day. Rightfully, imho. source )
"Time, it seems, doesn't flow. For some it's fast, for some it's slow.
In what to one race is no time at all, another race can rise and fall..." - The Minstrel
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