Re: Vertical Retrace Interrupt (?)

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1 total messages Started by Court Demas Wed, 05 Aug 1992 14:56

#422

Author: Court Demas
Date: Wed, 05 Aug 1992 14:56

11 lines
771 bytes

Oops.  It's on the CRT Controller (03d4h).  The Vertical Retrace End
is Index 11h and the bits are:
D5 - Enable Vertical Interrupt (0=Enable)
D4 - Clear Vertical Interrupt (0=clear)
D3-D0 - Vertical Retrace End - "The vertical retrace will end when the low
order 4 bits of the horizontal scan counter equal this value"

thanks..

-court

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