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PSP2600 -- any way to replicate Space Invaders double-shot hack?


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#1 WaverBoy OFFLINE  

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Posted Fri Apr 12, 2019 7:22 PM

So, I was wondering, that good old double-shot hack for Space Invaders for which you hold down the reset switch before you turn on the console...is there any way to replicate that in the PSP2600 emulator?

#2 Nukey Shay ONLINE  

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Posted Sat Apr 13, 2019 1:10 AM

The emulator is based off Stella (which allows you to hold the key assigned to the switch as a game is loaded).  If this is not possible for PSP, use a hack that already has the glitch in place for all game selections.

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#3 WaverBoy OFFLINE  

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Posted Sat Apr 13, 2019 11:51 AM

The emulator is based off Stella (which allows you to hold the key assigned to the switch as a game is loaded).  If this is not possible for PSP, use a hack that already has the glitch in place for all game selections.


Thank you SO MUCH!!!

#4 WaverBoy OFFLINE  

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Posted Sat Apr 13, 2019 2:31 PM

The emulator is based off Stella (which allows you to hold the key assigned to the switch as a game is loaded).  If this is not possible for PSP, use a hack that already has the glitch in place for all game selections.

 

Unfortunately the 2600 emulator for PSP must require the .a26 file extension for ROMs, as that's what all the other 2600 ROMs in the emulator have, and this .bin file isn't showing up in the emulator.  I tried renaming the .bin file extension to .a26, but it didn't work.  Thoughts?



#5 Nukey Shay ONLINE  

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Posted Sat Apr 13, 2019 3:23 PM

Both .a26 and .bin refer to binary rom files. Some prefer to use the .a26 file extension, as the name is specific to the 2600 hardware.  Renaming the file should have worked, unless the emulator expects that a game profile already exists.  Do any other hacks function?  You might try "Beast Invaders", which predates the creation of Stella 2.0 by 5 years (and has the glitch present by default).

 

http://atariage.com/...ftwareHackID=36

 

EDIT: Just checked my laptop, and the old version of Stella has this entry in it's database...so it should work (unless hacks were removed when creating the PSP build).

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Edited by Nukey Shay, Sat Apr 13, 2019 3:41 PM.


#6 WaverBoy OFFLINE  

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Posted Wed Apr 17, 2019 1:51 AM

Both .a26 and .bin refer to binary rom files. Some prefer to use the .a26 file extension, as the name is specific to the 2600 hardware.  Renaming the file should have worked, unless the emulator expects that a game profile already exists.  Do any other hacks function?  You might try "Beast Invaders", which predates the creation of Stella 2.0 by 5 years (and has the glitch present by default).
 
http://atariage.com/...ftwareHackID=36
 
EDIT: Just checked my laptop, and the old version of Stella has this entry in it's database...so it should work (unless hacks were removed when creating the PSP build).


The Beast Invaders hack works, but it would be nice to be able to play the original game with the double shot. Renaming the file using the .a26 file extension doesn't work; my MacBook still says it's a bin file when I highlight it, and it doesn't show up in the emulator. Any ideas? Thanks for your help!

#7 Nukey Shay ONLINE  

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Posted Wed Apr 17, 2019 1:04 PM

You might have file extensions hidden in your browser, which would explain why your mb still says it's a .bin.

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#8 WaverBoy OFFLINE  

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Posted Fri Apr 19, 2019 7:19 PM

You might have file extensions hidden in your browser, which would explain why your mb still says it's a .bin.

 

You were correct about my Mac settings; I switched it to show all file extensions and was able to change the extension properly to .a26 so that it no longer shows as a .bin file, thank you.  However, it still doesn't show up in PSP2600.  I downloaded the last ROM you posted that already had the .a26 extension; that doesn't show up either.  Nor does the ROM for Space Rocks I downloaded, even after properly changing the file extension.  Perhaps these games just aren't compatible with PSP2600.  :-(


Edited by WaverBoy, Fri Apr 19, 2019 7:37 PM.


#9 Nukey Shay ONLINE  

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Posted Sat Apr 20, 2019 12:41 AM

You might be limited to only game Roms that existed in Stella's profile database prior to 2005.

 

At least Jeff's hack works.

 

Q: Stella has supported Cheetah codes for ages.  Does PSP2600?

The code for NTSC Space Invaders double-shot is 760000 (i.e. 760 00 0 = Rom address $760, change value to $00, no additional bytes).






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