Re: For the TWGS and The Zip cards

[ToasterKing <ToasterKing@mindlessPLOP.com (Delete "PLOP" to reply)>]

In article <19990330220918.20282.00000354@ng25.aol.com> Supertimer,
supertimer@aol.com writes:
>Hi, you must have not heard yet.  The information in Nathan's
>accelerator FAQ is outdated.  Ever since Western Design
>Center came out with the improved 14Mhz 65C816 chip design,
>replacement GAL chipsets are no longer needed.
>
>The GALs were designed as traps for certain 65C816
>instructions that would fail at high speeds, slowing down the
>CPU when those instructions were executed.  However, the
>new 65C816 design no longer fails when those instructions
>are executed at high speeds.  Thus, it is now actually
>detrimental in terms of performance to get the replacement
>GALs!  One of the GALs also traps a bug in the old 65C816
>which, when run at even normal TWGS speeds, caused
>conflicts with the RamFAST card.  But this GAL is ALSO no
>longer needed...if you have the 14Mhz 65C816 installed,
>the card will work with the RamFAST with the original GAL
>chips.

Howdy-doo there!  I've been wondering this for quite some time now...
How involved would it be to take the existing design of each GAL and
modify it, in order to produce copies of the GAL chips that do not have
ANY of the traps that are no longer needed, since having the traps slows
down processing?  Correct me if I'm wrong, but doesn't the ORIGINAL GAL
chipset (not the high speed replacement!) also cause the TWGS to consume
CPU cycles for instructions that would normally fail?  Anyway, about the
chips, I don't know anything about chip-making or EPROM burners so I
don't know how involved it would be.  Is there someone who frequently
visits this NG who knows how and has the equipment to do this?  And
again, is it necessary?

-TK

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