Spectre GCR Manual Manuals - Atari Documentation Archive

Mac Mode
.. We can sort of scrunch two Mac scan lines into one
color line. This gives a fuzzy picture of the entire Mac
screen; text isn't especially readable, although you can
stand it for awhile.
Neither one of these is particularly appealing, so we at least give
you the option of doing either. You can change anytime you're in Mac
mode with a key press.
If you're working in a small area of the screen, you may want to
stay in "half screen" mode, since you can see what you're doing.
Perhaps you can size the working window to half-screen; in that case,
you're in fine shape.
.. To toggle to half screen mode, press "SHIFf-(" on the
numeric keypad to the right of the main keyboard.
.. To toggle to scrunch screen mode, press "SHIff -)" on
the numeric keypad.
.. While in half-screen mode, to see the top half of the
screen, press "SHIFf->t" (asterisk) on the numeric keypad.
To see the lower half, press "SHIFf--" (minus sign)
on the numeric keypad. (The ">t" is on top of "_",
thus it's a bit intuitive).
When in "scrunch" mode, your color settings are going to be critical
to your visibility. We used to force them to an optimal setting, but
persistent complaints resulted in us taking that out; now, you can now
set them however you like in the ST's control panel, and we'll use
those settings.
To understand what's going on in scrunch mode, look at the ST's
hardware manual sometime. Each color dot onscreen is derived from
two memory bits, which can be one of four combinations. That forms a
number, 1-4; that number is used to determine which "color register"
to output from.
The screen is "scrunched" by taking one Mac dot, putting it into
one ST screen bit, taking the Mac dot underneath it, and putting that in
the other screen bit.
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