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Date Posted: 19:20:03 03/24/03 Mon
Author: Potter
Subject: Re: How to invert the video using code?
In reply to: Phil 's message, "How to invert the video using code?" on 01:25:30 03/22/03 Sat

It's just a matter of selecting the correct gate in the 4066 to turn on by writing a control byte to portB at the appropriate time IE in the code at 'NORMAL' in MAKEHLINE you'll see MOVLW VIDEO & MOVLW INVERSE where these constants are bit patterns for the 4066 and the correct one is chosen by the state of DOINVERT which is bit 3 of the MODE register.

>Hi Mike.
> After a few weeks away, no joy with paldig code, the
>system here must be incompatable. Have managed to iron
>out the probs with 16f84dan.asm, however still dont
>know how to code the chip to invert the video. The pic
>chip is locking, as before, and is stable, however the
>video is always inverted. Before the pic processor, I
>tried an inverter using an op amp and the result was
>ok however suppressed sync was causing dropouts.
>Thanks fo reading

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