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Date Posted: 05:48:29 03/01/02 Fri
Author: Potter
Subject: Re: Info on line 21
In reply to: Kenobi 's message, "Re: Info on line 21" on 23:23:38 02/28/02 Thu

If you have one of the line18 code types then it does require the info to decide how to descramble (audio privacy, invert etc). It's quite easy to modify the code to sample on line 21 instead of 18 as this is set up in MAINLOOP or FRAMESTART as it's named in giln18a code EG

movwf Lines ; 1 Line (MakeHLine returns 1 in w)
nop
nop
nop
nop ;bsf GIDataCheck ; Indicate to check line 18 for GI Data
call MakeHLine ; Line 18

nop
nop
nop
movlw 2
movwf Lines
call MakeHLine ; Lines 19-20

nop
nop
nop
bsf GIDataCheck ;nop
movwf Lines
call MakeHLine ; Line 21

The 'bsf GIDataCheck' before line 18 is nopped and instruction now replaces a nop before the line21 call. This has to be done for the second frame as well (a little lower in the code)


>What's the purpose of that info?
>Anyway, does the 3chip will work even if the video
>signal doesn´t hace any info on line 18?

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