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[wickermanbr]

Hi friends.

First, sorry for my bad English. I'm from Brazil 

PHWiki says that is possible to eliminate GBA slowdown by replacing the supercard SDRAM module:


There's not much that you can do about this, short of taking your Supercard apart and putting in a faster SDRAM module.


Somebody did it ? It works ?

Somebody have more detailed information about this ? Or where I can find ?

[754boy]

Well I honestly think that they were just being sarcastic. But I suppose with enough technical know-how and the right parts, one could probably do it. 

[rarefluid]

The SDRAM chip is a Hynix HY57V561620CT-H (133MHz) http://www.chipcatalog.com/Hynix/HY57V561620CT.htm.
As you can see here http://www.kurobox.com/downloads/Hardware/kurosdram.pdf you could use a Hynix HY57V561620CT-6 (166MHz), which is faster. It has different cycle times etc. though, so you wouldn't be able to use it without a changed firmware, which you probably won't get...
Also the Supercard seems to have a 50MHz clock generator, so I presume the CPLD (Lattice LC4128V 75T100, 7.5ns tPD (propagation delay)) and the SDRAM are running at that speed too. So to get a faster system I'd say you'd first have to replace the CPLD. There are versions with 2.7 and 5ns tPD, but they are pricey: ~40/30$ (http://www.mouser.com/catalog/624/188.pdf).

Maybe there are some more hardware specialist around that can clarify things...
As much as I'd love to do this myself: It is stupid, expensive and probably won't work out because of missing firmware. So we'd better leave this alone altogether :/

[dantheman]

Thank you for the technical details.  I have quoted you in the PHWiki article - http://wiki.pocketheaven.com/SupercardGBASlowdowns