[Coco] Booting Nitros9.
gheskett at shentel.net
Mon May 11 13:08:46 EDT 2020
On Monday 11 May 2020 12:14:51 Alex Evans wrote:
> This RAM being faster than ROM thing is mostly a (relatively) recent
> phenomenon (like when RAM started to used more complex access
> characteristics to make up for being so slow). On most classic home
> computer platforms it is just as fast or even faster (for instance,
> ROMs were moved into RAM on Amigas because they could be patched, and
> because accelerators had faster access to on board memory than they
> did to system memory RAM or ROM). With things like CoCoSDC, SuperIDE,
> and CoCoFlash, you can rewrite the ROMs easily enough, and I believe
> booting from ROM would be faster than booting from disk.
Actually Alex, its pretty much maches niches, it still takes the coco3 11
seconds to move a megabyte. Disk or ram, I have tested both.
> On Mon, May 11, 2020 at 5:41 AM Jeff Teunissen <deek at d2dc.net> wrote:
> > On Mon, May 11, 2020 at 3:07 AM Dave Philipsen <dave at davebiz.com>
> > > OS9 could easily be built into ROM. It may be practical for an
> > > embedded system where the operating system never gets updated. But
> > > you will almost always need some sort of read/write media for a
> > > typical system so you might as well just boot the operating system
> > > from that media.
> > >
> > > Another drawback of using ROMs is that they, and other forms of
> > > non-volatile storage, usually have slower access times than RAMs.
> > > So you may limit yourself on the maximum CPU speed whereas loading
> > > the system into RAM generally means it can run faster.
> > Except on a CoCo 1 or 2, where programs in ROM can run twice as fast
> > as programs in RAM.
> > --
> > Coco mailing list
> > Coco at maltedmedia.com
> > https://pairlist5.pair.net/mailman/listinfo/coco
Cheers, Gene Heskett
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