In article <5b81nh$…@news.mel.aone.net.au>, elmer…@wb.com (Elmer Fudd) says:
>I know the first channel (by default) is set in MODE 0 (interrupt on
>terminal count) and is responsible for the ticks that occur 18.2
>times/second, by triggering hardware interupt 0.
>BUT! What do the other channels output too?
The 8253 (later 8254, intergrated in the 82C206 etc)) has three
timer channels
The 2nd is triggering the dram memory refresh, the dma channel 4.
The 3rd is used for the speaker sound (there is a gate circuit).
Osmo
Hi all!
I’m playing around with the 8253 timer and need some information on
what the three timer channels actually control on a standard IBM-PC
compatible mainboard.
I know the first channel (by default) is set in MODE 0 (interrupt on
terminal count) and is responsible for the ticks that occur 18.2
times/second, by triggering hardware interupt 0.
BUT! What do the other channels output too?
Are there any Guru programers that can answer this question?
Cya
Ian S.