How to increase Chip Ram ?

[Zac67]

WhichAmiga may be wrong, but a 8367 Agnus is a DIL type and would not be upgradable.

If there's a PLCC type in place (should be with the composite output), you can very easily swap that with an ECS type, change 2 jumpers and you've got 1 MB. For 2 MB it's the Mega-chip route.

@shaf
There are (very) different rev 4 mainboards. 4.0 usually is the A1000 chipset German 2000, the A500 chipset American 4.0 rev is extremely rare. 4.1 onwards is always A500 chipset (PLCC Agnus) & Buster.

[Zac67]

I wonder if it's feasible to build PLCC to DIP adaptors for this purpose (assuming both chips are hardware IO-for-IO compatible and just in different packages)

They're surely signal compatible but unless you'd want to upgrade a machine very special to you it's so much easier to get a later board (or whole machine). Actually, it might be a good idea to start with a 1200 - saves you the Megachip.