PAL on A2000

[psxphill]

Is there a jumper on the Amiga 2000 like on the A4000 that allows you to "lock" the computer into either NTSC or PAL?

It depends on the Agnus revision.

OCS Agnus was fixed to 50 or 60hz and couldn't be changed ever.

Some ECS Agnus detected 50 or 60hz through a pin, but on some ECS Agnus that pin was used for something else and the 50 or 60hz default was internally set but could be overridden by software.

I'm sure there is a commodore service bulletin online that covers what needs to be done to replace one Agnus with another and the details about the different Agnus were in there. It's possible that the decision to revert to specific Agnus chips may have been as a result of the extra work required when servicing old motherboards that didn't have the 50/60hz jumper.

[psxphill]

According to schematics there is a solder blob J102 connected to Agnus chip PIN41 TEST.
Normally the pin is connected to GND, but when you break it, the pin goes to 5V (through resistor).
I'm pretty sure I made that mod before and it worked.

I love schematics!

It depends on the Agnus chip. This document should cover it.

http://www.amigawiki.org/lib/exe/fetch.php?media=de:parts:agnus_reworks.pdf

It looks like rev 6.4 boards should ship with J102 open on NTSC and PAL machines.

I have no idea what revision of motherboard or agnus that tonyvdb has.

[psxphill]

I looked at the BBoA website picture of v4.3 motherboard and the FAT LADY is written on it and has a J102 jumper next to it, so it looks like v4.3 MBs had the FAT AGNUS installed.

Fat agnus just means it's not the A1000 agnus, which was also used in the german A2000. It only refers to the packaging size and the only functionality change was support for ranger memory @ c00000. Later changes like 1mb or 2mb chip ram and switchable 50/60fps can only be determined by the part number, they were all fat agnus.