TRS-80 Model I
buseyl at yahoo.com
Sun Feb 4 13:39:35 CST 2007
--- Chuck Guzis wrote:
> On 4 Feb 2007 at 0:56, Tony Duell wrote:
> > And another oddiity. The whole design of the Apple
> ][ seems to have been
> > to save a chip if at all possible (provided the
> machine still works --
> > just). And yet the kayboard was encoded in
> Why? It meant you
> > couldn't implelement a lower case keyboard in
> software (there are the
> > well-known shift key mods where you run a wire
> the shift keyswitch
> > to one of the single-bit inputs on the games
> connector, which shouldn't
> > have been necessary).
> Thank you for absolving me of being the first to use
> the term
> "gutless wonder". :)
LOL. That has a certain ring to it.
It gives character. :)
> In a way, I suppose the disk controller was a clever
> design. But it
> locked the CPU into 2MHz operation. The use of a
> simple arithmetic
> checksum for each sector was not perhaps the most
> reliable solution
> either. But the biggest problem is that disk
> and writing
> required 100% attention from the CPU. On most other
> computers that
> used dedicated LSI controllers, the possibility
> existed for
> overlapped computation/disk access.
Oh yes, that's a huge gotcha with the disk II. It
could make communications software or data logging
There were other disk systems for the Apple though
none as ubiquitous.
I like the Disk II. I don't think it was the ultimate
disk system, just a clever/ cheap one (for Apple at
Looking for earth-friendly autos?
Browse Top Cars by "Green Rating" at Yahoo! Autos' Green Center.
More information about the cctech