26 Nov
2007
26 Nov
'07
3:45 p.m.
--- Jim Brain <brain at jbrain.com> wrote:
Roy J. Tellason wrote:
From memory, the first memory location in ram
corresponded to a pixel 8 in and 8 down from the top
left corner of the screen. Then you went toward the
screen as you *ascended* in memory. Then...you
proceeded to the next line, 1 pixel above where you
started. So instead of having a normal rectangular
coordinate layout, each 8 x 8 *character* was inverted
kind of. 5 to 7 lines of BASIC code to convert to true
rect. coordinates. But with boolean operators you
could do it in 2.
Of course most other computers are more *normal*
w/regards to the way their vid mem is layed out. This
applies to all *known* peecee video cards also. Anyone
know of exceptions?
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On Friday 23 November 2007 22:01, Chris M wrote:
> The 64 has the weirdest video memory layout you
could ask for (afaik), and
> the books aren't always cheap (eBay). A
few of
them are a necessity. I went
> looking for some and was astounded at the
prices
they were getting. Maybe
> that's died off. If you can find someone
with a
whole cache of stuff, you'd
> luck out.
>
Lots of the books are now online at Project64, so
depending on your view
of orphaned data, you can print reference materials
out.