Re: TWGS without fast GALs (was Re: ORCA/C v2.0)

[voss@i40s16.ira.uka.de (Stefan Voss)]

In article <fmlin.3str@terapin.com>, fmlin@terapin.com (Frank M. Lin) writes:
|> 
|> [stuff deleted]
|> Use new GALs: As indicated in the sidebar "10 Megahertz Barriers",
|> some operations are unreliable when you drive a 65c816 processor
|> faster than 4 MHz.  GAL chips on the TWGS intercept these instructions
|> and add additional cycles when they excute to provide reliable
|> operation at faster speed.
|> 
|> You need a revision E ( or later ) #3 GAL to operate the TWGS at 10
|> MHz; Applied programmed that chip to compensate for certain 16-bit
|> instructions that do not excute properly at 10 MHz. [..]
|> 

O.K., my TWGS came with a #3E GAL (no GAL update), so I can go to 10 MHz. 

|> 
|> You can order the TWGS 3E GAL directly from Applied as a single
|> item, but I suggest that you get the set of four high performance
|> GALs ( #2, #3, #4, and #5 ) if you are going to the trouble and expense of
|> ordering.  Those high performance parts increase the likelihood of
|> the success with your 10 MHz upgrade.
|> [..]

That's the point. Previous articles say that AE doesn't sell these high
performance GALs anymore, but there are offers for that 14-MHz 65SC816.
So again: Has anybody gone beyond the 10 MHz without the fast GAL set, but with
a fast processor ?
Any information is welcome.

|> 
|> frank m. lin
|> fmlin@terapin.com

Stefan Voss
(voss@ira.uka.de)