JavaGX4000

[Devilmarkus]

Today I decided to make my GX4000 emulator public.
You can access it here: https://sourceforge.net/projects/javagx4000/

Sources can be found in the SVN repository.

[Devilmarkus]

Need more info about sprite effects (by changing CRTC registers)

Reg. 9 seems to let the sprites repeat?!? (Always when is not 7 or only when is 0???)

Example:
http://java.cpc-live.com/csd/index.php?cpr=Plus.zip&dsk=lumiere.zip&boot=cpcpower

What is with X-repeats? Are they possible, too?

[robcfg]

Btw, when I try to run JavaGX4000.jar, I get the following error message:

Code Select Expand


---------------------------
Java Virtual Machine Launcher
---------------------------
Could not find the main class: JCPC.ui.GX4000. Program will exit.
---------------------------



Is there anything else I need to get it running?

[arnoldemu]

the sprite stuff is all driven off crtc internal values. they use the internal Raster counter, horizontal character counter, vertical line counter to and compare that against the sprite coords.

So for example if you set CRTC R9 to 31, sprite lines will repeat 4 times.

The sprite will also repeat if you use rupture/splitting, and position them in the appropiate places.

repeating horizontally/vertically is also possible by re-programming the x coordinate.

[mr_lou]

I also get an error message:

Code Select Expand


Exception in thread "main" java.lang.UnsupportedClassVersionError: JCPC/ui/GX4000 : Unsupported major.minor version 51.0
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
    at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Could not find the main class: JCPC.ui.GX4000. Program will exit.


[Devilmarkus]

I guess you can't see the applet, because your java version is outdated.

Compiled it backwards compatible to java version 1.5 (was 1.7)

Should run now.

About the sprites:
I have no proper clue yet, in which cases reg. 9 affects them, but it seems I'm on the right way:
(Screen looks fu**ed up because bad CRTC emulation / interrupt timings)

[robcfg]

It works indeed! Thanks Markus! 

[Devilmarkus]

Got a quiz question for all emu coders:
[attach=2]

How can I fix that? (MODE appears wrong in upper screen, and YES, I set MODE and ROM properly (I hope))