[fpc-devel] Improving i8086 performance..

Jim Leonard trixter at oldskool.org
Fri Dec 27 16:57:56 CET 2013

On 12/27/2013 9:35 AM, Kostas Michalopoulos wrote:
> If you want to do speed tests, try some emulator. For example PicoXT
> (which emulates an XT clone):
> http://www.picofactory.com/free/software/pc-xt-emulator/

That emulator is not cycle-exact, so it doesn't have the same 
characteristics as the real hardware.  PCem comes closer, but is also 
not exact.

Because MUL/IMUL/DIV/IDIV on 808x has variable execution times based on 
the inputs, it is best for the OP to test on real hardware if he wants 
an accurate comparison.
Jim Leonard (trixter at oldskool.org)
Check out some trippy MindCandy: http://www.mindcandydvd.com/
A child borne of the home computer wars: http://trixter.oldskool.org/
You're all insane and trying to steal my magic bag!

More information about the fpc-devel mailing list