[gx4000] some tests

[nitrofurano]

just some tests - this one is for cpc+ (gx4000) display mode 1 (as shown at <!-- m --><a class="postlink" href="http://www.boriel.com/wiki/en/index.php/ZX_BASIC:Released_Programs_-_AmstradCPC#test01_displaymode1">http://www.boriel.com/wiki/en/index.php ... splaymode1</a><!-- m --> )

[nitrofurano]

here is one for the display mode 0

[nitrofurano]

for display mode 1 again, optimized