Gp2x-7800: Atari 7800 Emulator For Gp2x V1.0.2


zx-81

zx-81

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ProSystem is the best emulator of Atari 7800 game console, running on Windows system.
It has been written by Greg Stanton, see http://home.comcast.net/~gscottstanton for details.

Here is a port on GP2X of the version 1.1 that i had previously ported to PSP.

What's new in this version :

- Merge diff from ProSystem v1.2
- Improve speed[cut]
- Improve emulation accuracy
- Add MMU hack stuff
- Add option to display frame rate
- New speed limiter function
- Improve volume handler
- Linked with my patched version of SDL
- New background image
- Bug fix in file requester

How to use it ? Everything is in the README.txt file.

You can download it here :
gp2x-7800 v1.0.2

Enjoy,

Zx[/cut]
 
Excellent it does seem faster. I've given it a quick go, but I've found that in Pole Position II that the text at the top is distorted. Almost like there's a mixture of resolutions. The top should be high-res and the bottom low-res or something like that. I'm pretty sure that this wasn't like this in the previous version.

EDIT: Yes definitely happening in other mixed resolution games like Impossible Mission in the elevator sections.
 
I tried this a bit. It seems a little faster. I am still getting very stuttery sound though.

Thanks for the update.
 
slaanesh said:
Excellent it does seem faster. I've given it a quick go, but I've found that in Pole Position II that the text at the top is distorted. Almost like there's a mixture of resolutions. The top should be high-res and the bottom low-res or something like that. I'm pretty sure that this wasn't like this in the previous version.

EDIT: Yes definitely happening in other mixed resolution games like Impossible Mission in the elevator sections.
Click to expand...
Yes you're right, i've that bug in the psp version 1.0.6 as well ... I will fix it asap. :(

EDIT: I've uploaded a new version on my blog ...
 
Last edited by a moderator:
Yep, that's it! Pole Position seems good now.

Oh and the new background is nice. I like it!

Adding the mmuhack.o seems to make it go faster, though I haven't done any specfic testing.

Another thing that could help speed up the emu would be the optimized ram timings. Do you have any plans to include support for this?

@ ZX-81: One more question. The emulators you have ported across are a fairly esoteric mix; may I ask why you have chosen these? I'm guessing that you have some sort of affection for these particular machines?

ie. The 7800 emu is the one I have most interest in as I own an 7800 console.
 
slaanesh said:
Yep, that's it! Pole Position seems good now.

Oh and the new background is nice. I like it!

Adding the mmuhack.o seems to make it go faster, though I haven't done any specfic testing.
Click to expand...
Yes it's a little bit faster ...

slaanesh said:
Another thing that could help speed up the emu would be the optimized ram timings. Do you have any plans to include support for this?
Click to expand...
I haven't tried this hack, do you have any pointer/URL on this ?

slaanesh said:
@ ZX-81: One more question. The emulators you have ported across are a fairly esoteric mix; may I ask why you have chosen these? I'm guessing that you have some sort of affection for these particular machines?
Click to expand...
I like old school games, that might explain :).
 
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Last edited by a moderator:
For the Optimized Ram Timings, you could have a look at the source code for gpSP.

I've been trying to compile however my devkit can't find the libSDL_fast.a :-/

Removing it from the Makefile of course gives unresolved references. Where can I get this lib?
 
slaanesh said:
For the Optimized Ram Timings, you could have a look at the source code for gpSP.

I've been trying to compile however my devkit can't find the libSDL_fast.a :-/

Removing it from the Makefile of course gives unresolved references. Where can I get this lib?
Click to expand...
Just link with the classical SDL lib (remove the '_fast' in the makefile). This is a patched version of SDL, where i've removed the Wait Vblank call etc ...
 
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zx-81: does your patched SDL provide an all-around speed advantage to general use as compared to the regular SDL? Any boost of speed would be of great use to everyone using SDL :)
 
Alex. said:
zx-81: does your patched SDL provide an all-around speed advantage to general use as compared to the regular SDL? Any boost of speed would be of great use to everyone using SDL :)
Click to expand...
I win up to 5 fps. In function GP2X_FlipHWSurface, i've just commented out the first few lines concerning the Blitter and wait Vblank stuff. It might result in graphical artefacts, so it can't be part of an official SDL version ;).
 
Last edited by a moderator:
I thought it only waited for vsync if you have SDL_DOUBLEBUF set in SDL_SetVideoMode.
 
getting faster :D
any idea why I get a blank screen on planet smashers ?
also, any plans for usb joystick support for the BOB?
 
1200XL said:
getting faster :D
any idea why I get a blank screen on planet smashers ?
Click to expand...
I really don't know, i've to test it on original emu and see what happens.

1200XL said:
also, any plans for usb joystick support for the BOB?
Click to expand...
I've no usb joystick to test with, and i'm a beginner on this kind of stuff :( ..
 
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