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Old 04 April 2017, 21:49   #1
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Wanted: 8372A fat agnus chip NTSC

Trying to upgrade a NTSC Amiga 500 so it will run PAL region public domain games. Heard that the 8372A has to be from a NTSC machine such as a 2000.
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Old 05 April 2017, 21:09   #2
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Agnus versions are a very complicated topic but CGS released a universal 1MB 8372A for PAL and NTSC, working on both PAL/NTSC: Part number 318069-02. When using 8372A, you can select PAL/NTSC mode on boot-up.

You can check this table Big Book of Amiga Hardware: Agnus

If your A500 rev 6a already have 318069-02 and you want to fully change from NTSC to PAL, you'll need to change the crystal, from 28.6363MHz (NTSC) to 28.37516MHz (PAL) and change JP4:

open JP4 = PAL
closed JP4 = NTSC

To change A500 rev5 from NTSC to PAL you have to change the crystal from 28.6363MHz (NTSC) to 28.37516MHz (PAL) and change the 8370 to an 8371 Agnus.

Last edited by act; 07 April 2017 at 01:04. Reason: rev5
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