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Modify the Real Time Clock Driver(more).

Posted on 1997-07-07
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Last Modified: 2013-12-16
Hello! I want to have a more information about making or modifying the real time clock driver in win95 or in dos.
I will make a new device that supply real-time to PC.
and I will make the new-RTC driver replaced a old driver.
The experts "ESI" suggested that steals the interrupt, but
I don't know the method to steal. would you tell me the method.
Thanks in advance.
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Question by:mgkim
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Accepted Solution

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ESI earned 30 total points
ID: 1749351
Change the pointer of the interrupt to your part of code.
The address is in page 0, at 0x1C if I'm not wrong
(so long I had'nt to do low-level programming...)
Stop the initial interrupt b4 making the change, or
you probably will jump somewhere in the memory ;-)
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Author Comment

by:mgkim
ID: 1749352
Sorry! "ESI" : I don't understand your answer. what is the pointer of the interrupt? is it the interrupt handler?
I guess that RTC-driver will be excuted when any application want to get the current time. then will interrupt be issued?
Also, I know that the RTC-drvier is not active, is passive.
It issues the interrupt when alarm is setting. Is my guess is wrong?
Anyway, thanks to your answer, sincerely!
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Expert Comment

by:ESI
ID: 1749353
I figure out there are 2 differents interrupts, one that raise the alarm, and the other, the timer int. that raise about 18.2 times per second.
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Author Comment

by:mgkim
ID: 1749354
Thanks to "ESI"'s response!
Will you introduce some reference(books)? or will I ask about more information using e-mail? otherwise will I ask more in this site?
my e-mail address : mgkim@hyowon.cc.pusan.ac.kr

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LVL 3

Expert Comment

by:ESI
ID: 1749355
Try to ask, as I have no docs anymore (look for a DOS Interrupts  book) ask in this site after you had a look in the KB of microsoft indeed !
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