[stella] My version of a scrolling demo

[Eckhard Stolberg <Eckhard_Stolberg@xxxxxxxxxxxxxxxxxxxxx>]

John said he doesn't mind some competition and he wondered how much
difference a six sprite routine would make to the scrolling display,
so I did two little demos by myself. They work like Kurt has sugested
it, so I hope he isn't disapointed about my programming skills as well. ;-)
Both feature a font which is 7 (double)scanlines high and up to 8
pixels wide (+ 248 blank pixels after a character, if you want to).
The character set has ASCII characters from $20 to $7e and the text
can be added conveniently in ASCII form to the scource code.

SCRLBAR6.BIN uses single scanline resolution and can have 3056
characters. Since it was a bit hard to read on a real VCS, SCRLBAR5.BIN
uses double scanline resolution and can hold only 3015 characters.
On a Supercharger both programs can only hold 4 characters less than on
a real cart or an emulator.

These BINs are sligtly optimized versions of two BINs that I posted
two days ago, but that Glenn hasn't approved yet. If both post make it
through at the same day, I apologogize for the double post.


Ciao, Eckhard Stolberg.

Attachment: Scrlbar5.bin
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Attachment: Scrlbar6.bin
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