[Coco] Booting Nitros9.
varmfskii at gmail.com
Mon May 11 14:43:57 EDT 2020
Doesn't OS-9 search ROM for modules and mark for access so that they
can be used by the system, so they don't have to be copied into RAM.
Wasn't that the idea with the module in the FP ROM?
On Mon, May 11, 2020 at 1:09 PM Gene Heskett <gheskett at shentel.net> wrote:
> 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
> "There are four boxes to be used in defense of liberty:
> soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author)
> If we desire respect for the law, we must first make the law respectable.
> - Louis D. Brandeis
> Genes Web page <http://geneslinuxbox.net:6309/gene>
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