RE: 1 or 2 MHz interrupt on PC

ncoplin_at_orbeng.com
Date: 2001-05-08 10:46:51

Hi Spiro,

>I did measurements and saw that I had a resolution of about 4 Ás, that is,
>my maximum frequency was about 250 kHz. That's because taking the time-
>stamp
>So, possibly, with a faster CPU, you could achieve 1 MHz. Anyway, I'm not

The speed limitation in this case seems to be reading from the I/O area on a
PC. This is because the bus slows down (for ISA at least). The best I've
ever come across is approx 1MHz read rate from the I/O area on a PIII-600
using 8bit accesses. I expect the limiting case is not much faster than
this.

- nick


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