Find the differences (A500)

[Xumet]

Hello,

(warning! very noob question! :shhh

I've two "different" A500 motherboards:




- All motherboards are A500 rev6A
- The second one have extra memory chips on board.
- The second one have some soldered wires

Why these differences? Different motherboards "sub-version" or just "human made"?

Thanks a lot
Xavier

 

[Justin]

looks like the 1mb chip ram mod

 

[demolition]

Agree, the lower board was modified to have 1MB chip mem.

 

[Xumet]

Then, can I add an extra 1M to the second one to have 2M? :nuts:

 

[roy_bates]

Then, can I add an extra 1M to the second one to have 2M? :nuts:

nope,not as far as know.

 

[demolition]

Not chipmem, unless you find a MegAChip upgrade which is rare and expensive:
http://amiga.resource.cx/exp/megachip

You can add some fast mem though, and here's an example of a 4/8MB expansion:
https://www.amibay.com/showthread.php?t=32896&highlight=kipper2k

 

[Xumet]

 

[AndyLandy]

Yep, looks like both boards are r6a boards, but the second one has had an extra 512k of ChipRAM hacked onto the board.

The only way to have more than 1MB ChipRAM on a board like this is to use a different revision of Agnus, which probably means an A500+ Agnus in a Megachip or similar; or an A3000 Agnus and a lot of hackery to fit the extra RAM.

 

[Xumet]

Thanks!