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1994-03-08
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54 lines
Pal -> NTSC
This is a simple hack that can be performed by anyone but best left to
someone with a fair knowledge of electronics. The idea is to stretch
your software to fill the botton third of the screen when using NTSC
software, there is nothing worse that buying software only to see it
doesn't use all of the screen. Many a PC owning friend has asked why
does it have that black spot at the bottom?
Well I wondered too! but no longer, I had noticed when using my Amiga
that it sometimes boots up in NTSC, you know when the screen won't
display anything past 200 lines. When if it can boot when it wants to,
why can't it boot when I want to!
The first thing you require in order for this mod to work is a Fat Angus
No 8372A, you can check this out with a program called Sysinfo. (There is
a version on CU Amiga Disk 46 Dec 92). You also need one SPDT switch and
two 500mm hook up wire. To make job secure a low wattage soldering iron.
Right, from here on in your own your own, anything you do you take full
responabilty for, if you are unsure, STOP! and let your techie do the job.
REV 6 Boards
------------
Opening up your Amiga 500 and exposing the motherboard you reveal the
ECS Angus Chip near the main CPU 68000, looking closer you can see a
jumper pads marked on the board JP4, this is between the two chips. This
jumper should be in fact open as is the case with PAL Amiga's, now the
idea is to connect a switch between the jumper therefore connecting it
in one mode and disconnecting in the other. What in fact this does is
take to earth off Pin 41 of the Angus Chip and make it boot Pal. Solder
a wire to each pad and connect it to the switch that can be mounted on
the outside of your machine.
REV 5 Boards Only works if a Angus 8372A installed
------------
Opening your case you will find you do not have a jumper marked JP4, so
your mod is a little more difficult, what you must do is bend pin 41 of
the Angus chip out and carefully solder one wire to the pin, the other
wire is then grounded. Install the switch as per REV 6 boards and you
have NTSC mode as well.
The switch can be thrown at any time, even if the machine is running but
the effect will not take place until a warm boot, now you should find
that your NTSC software will fill the screen, it does on my monitor
anyway. Of course this mod can be performed on Amiga 2000's as well.
Of course there is always the easy way of using a simple program called
60Mhz or Action Replay Mk III has a Pal/NTSC mod. I find this way more
reliable........
Happy Hacking!