 
| Sender: |
|
| Date: |
Fri, 6 Mar 1998 14:54:22 -0800 |
| Reply-To: |
|
| Content-type: |
text/plain; charset=US-ASCII |
| Subject: |
|
| From: |
|
| Content-transfer-encoding: |
7BIT |
| MIME-Version: |
1.0 |
| Organization: |
General Magic |
| Comments: |
|
| Parts/Attachments: |
|
|
On 6 Mar 98 at 14:52, Wilson B. Vicentini wrote:
> I am with a problem in which would need to know as the Pentium
> processor works in relation to measured of time, and as it would
> be described this architecture for intervals of time. Could anybody
> supply me some explanation, or pointers, or goods?
The CPU does not, directly, measure time.
The PC system implementation calls for a timer interrupt (IRQ 0)
about every 55ms, and the handler for this IRQ updates the system
time maintained by the BIOS.
This is adequate for normal "time of day" purposes, but not fine
enough resolution for many real-time applications. Recent versions
of Windows include a high-resolution timer as part of multimedia
support. Alternatively, you can find several useful articles about
writing such timers, in back issues of Doctor Dobbs' Journal; these
are available on CD-ROM.
David G
|
|
|
