I don't remember all the details, but there was some reason why that was not
the way to do it -- maybe memory?  I probably have the code....somewhere ;-)

David

"Andrew C. Greenberg" wrote:

> On Thursday, November 22, 2001, at 09:30  PM, David P. Harris wrote:
>
> > I wrote a 4x8 character display routine in assembler for the Apple II
> > for Forth, so we could get a reasonable char/line.  It worked ok, but
> > had to use a lot of tricks and that addressing is mighty messy!  A lot
> > of work to cram the bits into the display memory.
>
> Well, in practice all you do is build a table of offsets, load the
> y-offset into the index register and use an indexed indirect mode to get
> to the correct byte.  The trick is making whatever you want to look
> good, because of the peculiarities in the color map.