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. > > ===== > Get a FREE 6Mb webmail box from go6502! - > http://www.geocities.com/profdredd > > As low as 2.99% Intro APR from NextCard! - > http://www.nextcard.com/index6.html?ref=aff0074521 > > PayPal is the FAST FREE and SECURE way to send > money! - > https://secure.paypal.x.com/refer/pal=profdredd%40yahoo.com > > __________________________________________________ > Do You Yahoo!? > Yahoo! Auctions - buy the things you want at great > prices > http://auctions.yahoo.com/ > - > This message was sent through the cbm-hackers > mailing list. > To unsubscribe: echo unsubscribe | mail cbm-hackers-request@dot.tml.hut.fi. __________________________________________________ Do You Yahoo!? Yahoo! Auctions - buy the things you want at great prices http://auctions.yahoo.com/ - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail cbm-hackers-request@dot.tml.hut.fi.
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