Tandy 64 Jr. - An intro for the PCJr.

[riq]

So, I couldn't figure out why one machine was faster than the other one, but I was able to make the intro run flicker-free (or at least as flicker-free as I could... sometimes a little line appears at the bottom-left) in both machines.

Changes:
* Detects if machine is PCjr A (faster one) or B (regular one).
* Detects if runs in <128Kb: aborts
* Detects if runs on NEC v20 / emulator: aborts
* Detects if machine is not PCjr: aborts
* More stable raster bar, a tiny bit faster.
* Raster-bar covers the full scroll letters (before, a line was missing).

I would appreciate if someone can test it and tell if it runs without flicker.
Thanks!

binary: https://github.com/c64scene-ar/tandy64/ ... andy64.exe
source code: https://github.com/c64scene-ar/tandy64/tree/ibm_pcjr

[jscrow]

Works great, perfect graphics, no flicker. Awesome!

[riq]

Works great, perfect graphics, no flicker. Awesome!

Thanks for testing it! And good to know it works ok!