DOSBox CPU cycles meaning ? \ VOGONS

DOSBox CPU cycles meaning ?

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First post, by tigrou

Posted on 2020-06-04, 07:39

tigrou Offline

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Posts: 28
Joined: 2014-01-19, 16:42

If I set "3000 cycles" in DOSBox , what does it mean exactly ?

Does it mean DOSBox is going to execute 3000 instructions per second, regardless the instructions ?
Or, does it mean DOSBox will run 3000 CPU cycles / ticks each second, some instructions (eg: DIV) taking more time than some others (eg : ADD)

I know some emulators take care about how much time each instruction take, is it the same for DOSBox ?

Last edited by tigrou on 2020-06-04, 09:22. Edited 1 time in total.

Reply 1 of 1, by jmarsh

Posted on 2020-06-04, 11:20

jmarsh Offline

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Joined: 2014-01-04, 09:17

DOSBox generally treats all instructions as taking one cycle, with a few exceptions (port read/writes, repeated string instructions etc).

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