Re: Double HIgh Resolution Question

[Eric Smith <eric-no-spam-for-me@brouhaha.com>]

"Bryan Parkoff" <BParkoff@satx.rr.com> writes:
>     If it is the case, why Apple II produce 560x192 instead of 280x192?

If you're talking about IIe double hires, it produces 560x192 when considered
to be monochrome, just as standard hires is 280x192 when considered to be
monochrome.  The color resolution (maximum number of pixels across the width
of the display which can have completely independent colors) is only 140x192
in either mode, because of the way NTSC color works, but double hires gives
you more color choices.

> I should be able to convert from 560x192 to 280x192 by removing a pair
> of dots each plot.  Each plot will only have one dot that will show 16
> colors on 280x192 instead of 560x192.  It will look much neater than
> 560x192 on emulator project.  What do you think?

Presumably you should do whatever makes the simulator[*] display look
closest to the display of a real Apple.

Eric


[*] In 1964, IBM defined "emulator" as regarding computers to be
simulation based on dedicated hardware or microcode.  Presumably you're
not developing hardware or microcode, so what you're working on is a
simulator.  Some people object to the use of the word simulator because
they think somehow that a simulator is less accurate than an emulator,
but there is nothing inherent in the definition of simulator that
requires or even implies this.

The first computer emulators were the options for the IBM 360/30, /40,
/50, and /65 which were implemented in a combination of hardware and
microcode, and allowed the user to run programs written for IBM's
earlier families of computers such as the 1401, 1410, 7010, and 7090.
Most later IBM mainframes dropped the emulator hardware and microcode,
and used pure simulators instead.