Re: Jeri board and extra things

From: Jeri Ellsworth (cm_easy_at_yahoo.com)
Date: 2001-05-02 17:54:59

Hi,

Sorry guy's I didn't intend this message to be posted
here.

Jeri
--- Jeri Ellsworth <cm_easy@yahoo.com> wrote:
> Thanks for the spec's!  I'm going to look them over
> in
> a few day's.  I have to work on some memory bandwith
> issues and see how I'm going to handle 1280 mode :(
> 
> Jeri
> --- Professor Dredd <profdredd@yahoo.com> wrote:
> > Okay Ruud,
> > 
> > --- Ruud Baltissen <Ruud.Baltissen@abp.nl> wrote:
> > > If one can reprogram his PC's FLASH-BIOS, it
> > cannot
> > > be so difficult to add
> > > this feature to our new design as well.
> > > On the other hand I like the suggested idea of
> > > loading the KERNAL in SRAM
> > > but not from EPROM but from disk like an OS.
> Even
> > a
> > > combination should be
> > > possible.
> > 
> > He're what I had in mind. At power up the entire
> > KERNAL is copied from a ROM into RAM. Then patches
> > are
> > loaded from a special RAM area that is not part of
> > the
> > main map and is not succeptible to power loss.
> > 
> > The special RAM should be outside the main memory
> > map
> > in the same way C-128 VDC RAM is. It could be made
> > "power-safe" a number of ways like (just off the
> top
> > of my head":
> > battery-backup like in Apple IIgs
> > NOVRAM like in modems
> > FlashROM like in PC BIOS
> > 
> > That is what I mean by PRAM and I am not sure what
> > technology would be best suited for such a design.
> > Whatever technology is used, here is the type of
> > thing
> > the PRAM will be used for:
> > custom key matrix
> > system clock
> > user customizeable KERNAL patches
> > 
> > Another good thing to put there would be system
> I/O
> > configurations defaults. For instance, what if you
> > want to address a second SID chip at $DE00, but
> you
> > already have Turbo 232 registers mapped there?
> > Suppose
> > you could map them both there and select between
> the
> > two with a softswitch? Then, you'll need someplace
> > to
> > store your user-defined default configuration so
> the
> > KERNAL can set the softswitches on powerup.
> > 
> > Just an idea. I have no clue how it might be done.
> > 
> > =====
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