What A2000 MoBo can have 1MB chip RAM ?

[rkauer]

Sorry, fellows.

Just put the 8372 (A if NTSC or B if PAL) in the socket to be able to deal with 1 Mb ChipRAM. Oh, and that damm strap (J500, I think)must be closed.

Need a very hard hacking to give the 2000 hability to manage 2 Mb Chip (8375 Agnus, modified Gary, some ttl hacks, etc)

[rkauer]

Yeah, for A500 that is true. Note this: we talking about A2000, who comes with straps instead!

It's just a matter of close J500 and change the Fat Lady (Fat Agnus on low-end Amigas)...

[rkauer]

And a FINAL information: ANY Agnus 8372 are able to manage 1 Mb ChipRAM...

[rkauer]

J101 !?!?!?!?

Is not the J500 (RAM adress)) ?!?!?

[rkauer]

I might have a related problem.  I have a early 2000B machine Rev 4.4.  When I got it, it had Kickstart 1.2 in it and already had 1MB Chip enabled.  Problem is when I try to do PAL screen goes black and video is jumpy.  Switch back to NTSC and it works ok.  So PAL does not work.  What could cause this?  It has a 8372 Agnus.

 Machine locked by the 1.2 ROM / Workbench. Upgrade the ROM & WB to 1.3.