From: 01ksdavis@bsu-ucs.uucp
Newsgroups: alt.sys.amiga.demos
Subject: Re: PAL switch methods
Date: 2 Sep 92 14:18:33 GMT

In article <92244.141822IO10781@MAINE.MAINE.EDU>, IO10781@MAINE.MAINE.EDU (Even better than the real thing.) writes:
> 
>   Ok. Now this is all a little hazy, but I think we made the switch
> like this:
> 
> 1) Go out and buy, scrounge up, whatever a simple on/off switch, and
>    some fine wire. What guage you ask? No clue. Just get something
>    really fine. It has to fit into a small space.
> 2) Now, open up your computer and expose the Agnus chip. (must be a
>    fatter or superfat Agnus)
> 3) Use a tiny piece of plastic (I used a little piece of hardish
>    celophane packaging which didn't bend too badly) to isolate pin
>    #7 on the Agnus chip. Now. This is the hazy part. Which pin is
>    pin #7 I am not sure. All I can be sure of is that it's 7 pins
>    in from one of the corners. At least that'll limit your search
>    down to 8 tries at most.
> 4) Anyway, after isolation, use the wire to connect the pin on the
>    Agnus to the switch and then to a ground. I used the drive casing
>    which is a ground for other things anyway. For ease of use, I bored
>    a hole in the bottom section of the casing right next to the drive
>    and stuck the switch through it. This way I can take the cover off
>    for susequent modifications without having wires holding the two
>    parts together.
> 5) There you have it. I believe it boots in PAL when grounded and in
>    NTSC when not grounded. Maybe it's the other way. Anyhow, one try
>    will answer this question.
> 
>   I have an Amiga 500 with a revision 5 motherboard. I don't know how
> this will work on a revision six or if there are any problems or
> ambiguities at all. I've never seen a rev 6 anyhow. As for 2.04 ...
> well, ... that's up to you to discover. At worst you'll just always
> have to boot in NTSC but have a nifty little switch sticking out of
> the casing. Tell everyone it's a panic button.
>   I hope this information helps. If not, well, tough luck I guess.
>   I did receive one piece of mail regarding my initial post about
> a PAL/NTSC switch. Whomever it was (I forget) said not to bother
> with a switch at all, since future Workbenches will support booting
> in PAL or NTSC. The only thing is, how much are you willing to pay
> and how long do you want to wait?
>   If anyone successfully instals a switch, please send me mail with
> a decription of which pin #7 is. Thanks.
> 
> .---------------.-------------------------------------------------------.
> |  ___________  |  MST3000 * Monty Python * Ren&Stimpy * IRC * Erasure  |
> | (__  ., . ._) | Calvin & Hobbes * //\ *  The Muppets  *  Duran Duran  |
> | ___) |\ | |   | Douglas Adams * \X/--\migas * IO10781@Maine.maine.edu |
> `---------------'-------------------------------------------------------'
	There are also software booters out there that will trick your system
into thinking it is a PAL system.  As far as I know, this works fine except for
a slower execution speed.  Utilities (as far as I can tell) are not affected.

	Some software booters (like the one I have) won't work an an Amiga 1000
for some reason.


			Kyle