Amiga 500 Rev.5 1MB ChipRam mod + using the Vampire for tests.

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Amiga 500 Rev.5, 512K + 512K Ram Expansion

8371 replaced with 8372A ECS Agnus which can address up to 1 MB of Chip RAM.

The Rev 5 mobo requires JP2 cut and the upper 2 pads blobbed.

On Agnus 8372A Pin 41 is used to select pal/ntsc and as the socket pin is connected to ground, this selects NTSC. Isolated pin on the Agnus and we have PAL.

Using the Vampire Gold 2.7 Maprom function to use in Rom diagnostics software.

Testing 1MB Whdload Games