[Coco] How much memory
Richard E. Crislip
rcrislip at neo.rr.com
Sun Nov 28 15:14:05 EST 2010
On Saturday 27 November 2010 15:25:00 Frank Swygert wrote:
> I agree with Aaron. Fast memory that OS-9/Nitros-9 can use would be
> One little nit though -- BASIC can't address 512K, not without a lot of
> modification anyway. BASIC is still limited to 64K without bank
> some of the RAM or using some other tricks. A RAM drive was a nice
> utilize the full 128/512K or RAM in a CC3 and speed things up at the
> time. A program could then be written in a modular form and
> modules as needed quickly. That was one trick I used in "CoCo Family
> Recorder", a modular genealogy program. At least I seem to recall
> that... was a long time ago!
> Date: Fri, 26 Nov 2010 22:21:43 -0500
> From: Aaron Wolfe<aawolfe at gmail.com>
> On Fri, Nov 26, 2010 at 9:48 PM, Becker,
Gary<Gary.Becker at amd.com> wrote:
> > > I was just wondering, how much memory could a CoCo3
> > > BASIC can only address 512K. NitrOS-9 can address a lot more,
> > > has a fixed amount of system resources and after they are
> > > additional RAM is wasted. A RAM drive is a good way to utilize a
> > > bunch of additional RAM. Compiling C programs from a RAM
> > > definately a lot faster than from a HDD. Which of these three
> > > is better?
> > >
> > > 1 1.5 Meg of memory that is able to run at 25 MHz.
> Assuming we are talking about CoCo3FPGA, I vote for option 1. As
> mentioned, with OS9 it is difficult to actually consume 512k with
> processes to start with, due to limited space in the system page.
> There is OS9 L3 and/or maybe some future projects that would open
> the system area enough to use more ram for processes. If so, it
> be preferable to have this ram be fast as possible.
> IMHO, a ram drive just isn't much use when the CPU is 25Mhz and
> primary storage is 460kbps.. everything is very, very quick without
> ram drive. I would not give up any "fast ram" that may be useful for
> processes in exchange for a ram drive.
> > > 2 512K at 25 MHz and 8 or more Meg for a RAM Drive that can
> > > accessed at 3.5 MHz or less.
> > >
> > > 3 Eight or more Meg of RAM that can be accessed at 3.5 MHz or
> > >
> > > Please limit to these three options.
> > >
> > > Gary
That's How I did it with an address database I modified from the
Rainbow. It is also the trick I used to modify a geography program from
the Rainbow. That program drew the outline of states and you got to
guess its capatol. I copied the addresses of the finished drawings as
bitmap to disk and loaded them rather than allowing the program to
draw it. It went much faster.
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