Still messing with the Amiga2000! (From Backup 10-November-2014)

There are a lot of different revisions of the Amiga 2000 Mobo,

But these are the three most common configurations:

Oldest with just 512k of ChipRam (Old Fat Agnus) (old Denise [graphics])

then there are versions with 512k ChipRam + 512k Fast (PLCC Fat Agnus) (old Denise)

Then there are new revisions that offers: 1mb Chip (new denise) (1mb capable Fat Agnus)

My Amiga2000 is a rev4.3

Originally with a PLCC chip with 512k chip 512k fast.

This version it's easily convertable to what is called "Full-ECS"

To do it we need to replace the old Denise Rom 8362R8 with the new one 8373R3.

  FatAgnus have to be upgraded too... 

from 8371 (capable of addressing only 512k of Chipram)

to a "smarter" 8372A (capable of addressing 1mb of Chip)

(there is no way to add 2mb of chip if not with an additional MegaChip Card)

Then we need to super carefully cut with a cutter, the connection pads: J500 and J200

and then, the last step, to move the J101 jumper to the left.

Thats it, now the machine use whole it's onboard memory as ChipMem (1mb)

instead of its usual 512kChip + 512kFast