Re: New GS/new accelerator

[Frank Carney <frankcTAKETHISOUT@ANDTHISALSOsrv.net>]

Delfs wrote:
> 
> The cache is a high speed memory.  The accelerator 'shadows' or copies the IIgs
> memory into the cache to run programs at high speed.  However, the accelerator
> must slow down to interact with the hardware on the IIgs.  So if you have a
> bigger cache, you can run longer in the fast memory (assuming no Rom or other
> hardware access is required.)  The speed will vary depending upon how much cache
> is used and how often the cache has to be refreshed or other IIgs hardware has
> to be accessed.
> 
> The results of cache performance can be both calculated and observed.  The
> latter is most effective when done using your normal software and a stopwatch.
> All software perform differently depending on the hardware required to access
> during execution.  (I won't go into the slow ram on the IIgs that allows
> compatability wilth old stuff.)
> 
> Hope this helps,
> Ed
> 
> Frank Carney wrote:
> 
> > Here is a serious question:
> > What does cache got to do with it?


Would it help to provide cache for ROM as well?
What about placing all RAM on the IIgs board with DRAM?
This should certainly be faster than the RAM in the IIgs.