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Date Posted: 10:22:42 06/30/02 Sun
Author: Manuel
Subject: Re: Thank you Potter
In reply to: Potter 's message, "Re: Thank you Potter" on 06:43:16 06/30/02 Sun

I have the scope with external and tv sync triggering.
In the file rev7a.zip of the DAve2 site, i compile rev7a.asm with any modification, the file rev7a.hex change, reference rev7a.hex of dave2 .

Can i modify the configuration word i the hex file, to change Oscillator type

: 02 1FFE 00FD 0FD5


THANK YOU FOR ASNWERS POTTER



>Master was a name for a little fellow in school shorts!
>
>I use the full MPLAB package (latest is 5.5?) so the
>paths to the linker and include files are correct. If
>you use MPASM or MPASMWIN alone just make sure the
>include file for the chip you're working on is in the
>directory and that case sensitivity is off, and
>produce INHEX8M output file.
>A 10MHz cro is just OK (I used a 15MHz) if it has 'TV
>sync' triggering and external triggering for more
>advanced troubleshooting IE generate a sync pulse from
>the PIC on the line you want to look at more closely
>with a simple command EG (in main loop)
>bsf portA,2 ;set RA2 high to trigger cro
>.
>. call makehline ; make line 18 for example
>.
>.
>bcf portA,2 ;reset RA2
>
>I haven't seen any specific tools for these packets
>but they may exist in the form of another PIC
>triggered like the cro above to collect the data and
>send it in serial form to your PC for
>collection/analysis - that's what I did but my system
>is very different to yours. If you have standard
>Jerrold line 18 mode packets the work's already done
>for you but there's much to be learnt here.
>
>
>>I have problems when i compile with MPASM.
>>What version do you uses? and options
>>
>>Can i study the data packet information with a scope
>>10Mhz?
>>
>>There are tools in the internet for study the data
>>packet information ?
>>
>>
>>
>>I have NTSC system THANK YOU MASTER¡
>>
>>
>>
>>
>>
>>>Not sure what the difference is between those 2 code
>>>versions but it sounds like it is in the way it
>>>detects the edges or at least the polarity
>>>(rising/falling) - carefully compare the lockon,
>>>makevbi and makehline routines and you may find a
>clue
>>>and I guess it's a fairly simple modification
>>required.
>>>Giln18 is for mode change packets on line 18 (NTSC)
>>>can you see this on a cro?
>>>If you have variable burst attenuation you will need
>>>to use the data packet information to 'fix' it.
>>>
>>>My system is PAL B/G 50Hz and I had to write my own
>>>code to deal with it but 'borrowed' techniques from
>>>all the code versions I could study.
>>>
>>>
>>>>All channels have sync pulse suppressed and not
>>>>inverted, with the code rev7a all channels works
>very
>>>>good.
>>>>With rev7t1a some channels its very hard to lock.
>>>>
>>>>Which is the difference between rev7a and rev7t1a
>>>>about sensitivity of the edge detectors?.
>>>>
>>>>ANOTHER QUESTION POTTER
>>>>
>>>>In my system the sync pulse and the burts is
>>attenuate
>>>>in two levels. dont have random video inverted, and
>>>>audio is clear. The original descramblers are
>>JERROLD.
>>>>Is this system for the code giln18?

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