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PacManPlus

Meteor Shower

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Hi Bob,

 

Is this kind of issue something that other 7800 programmers should be aware of when coding?

 

-John

 

The issue was that he was doing a LDA $04,X instead of a LDA #$04. The LDA $04,X was reading from location $04 which is the TIA collision register. It just happened that the value it got on the real hardware and on most emulators worked in this case, but MESS on the other hand was returning a value that didn't work. To be provide truely accurate emulation MESS should return the same value as the real hardware, but I am not sure what that should be.

Edited by DanBoris

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Yes, sorry - I was gone for a while.

This worked on real hardware and ProSystem so I never caught it. This was the offending line:

 

 

LDA	#PLYSHOT,X

 

It should have been

 

LDA	#PLYSHOT

 

MESS was loading $FF into 'A' which is the only value that would have made the program fail (I check for $FF to see if the object is disabled) :(

 

Thanks,

Bob

Edited by PacManPlus

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Update:

 

After talking with Dan Boris, I found an issue with Meteor Shower that caused it to not work with MESS. It is fixed, and included here.

 

Thanks,

Bob

 

Thanks for the update...Plays perfectly now. ;-)

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Great game! One comment: I have played it in emulation with Prosystem and I found the base shooter is a bright colour - as are the mountains in the background. Unlike the Intellivision original that inspired this, I find that when moving the base back and forth, it kind of blends in a bit with the background mountains, and in the heat of gameplay can get a bit lost in the background. Or is it just me..?

Edited by ls650

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After getting Bob's last few games I missed this one

I do hope another run is made or made available in the AA Store

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Great game! One comment: I have played it in emulation with Prosystem and I found the base shooter is a bright colour - as are the mountains in the background. Unlike the Intellivision original that inspired this, I find that when moving the base back and forth, it kind of blends in a bit with the background mountains, and in the heat of gameplay can get a bit lost in the background. Or is it just me..?

 

I think it is either "just (you)" or perhaps the color palette being used with ProSystem. On the actual system I don't encounter any blending, and don't see it under MESS either. Here are some captures straight from version 0.145u6:

 

post-18-0-27869400-1334710963_thumb.pngpost-18-0-26457100-1334710983_thumb.pngpost-18-0-36146900-1334711003_thumb.png

post-18-0-61359500-1334711019_thumb.pngpost-18-0-51595700-1334711038_thumb.pngpost-18-0-09104400-1334711057_thumb.png

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Looks great, cant wait til it comes out on cart form.

 

It already has. See post #70. You can PM Bob to see about buying one.

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Hi guys.

I can't get EMU7800 to recognize any of the roms on this thread. They are in the directory. What is the difference between SP and SH suffix? Thanks for any info.

Edited by KEWROCK

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What is the difference between SP and SH suffix? Thanks for any info.

Don't use an emulator, so can't help with that part, but the H is just the H from "sHower" in the name. That should be the NTSC version.

The P should be for PAL.

 

desiv

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Drats...

 

I really need to check 7800 more often...

 

I also need a power plug- mine finailly fried

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