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Help with Shock troopers 2

GarouSP

GarouSP

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Hi there,
I got a Shock Troopers 2 with P1 mask rom dead, its blown in the middle of eprom.
I don't had one 27c160 to change it so I tried with an 27c322.
The process was this: P1 have 1MB 27c322 is a 4MB eprom so I got the rom and copied p1, doubled it to 2MB and doubled to 4MB, when I teste it I only got blocks of colors, and nothing else, no text, no sprites, nothing, but I have all the sound and the game plays normally, at least based by the sound.
I don't know with I can use 27c322 to P1, if is possible probably I have to change jumpers?
If 27c322 can't be used for P1, 27c160 could really be used? If so the jumpers remains as is or need to be changed?
The plan is to double P1 file to fullfill 27c160, as 27c160 is a 2MB eprom and P1 file is 1MB.
 
No, you can't use a 27C322. 27C160 can be read 8 bit wide, 27C322 can only be read 16 bit wide.

EDIT: nevermind, program roms, not v roms. Use whatever you like!
 
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Shocktrooper is one of the game where I saw the most burnt P1.
It's also one of those game with 2 releases.

So... it's time to have fun: burn P1 from v1 and P1 from v2 in the same 27c160. Add a little switch to the cart so you can switch between the two bank and that's it: you have a 2in1 ShockTroopers.
 
Rom1 said:
Shocktrooper is one of the game where I saw the most burnt P1.
It's also one of those game with 2 releases.

So... it's time to have fun: burn P1 from v1 and P1 from v2 in the same 27c160. Add a little switch to the cart so you can switch between the two bank and that's it: you have a 2in1 ShockTroopers.
Click to expand...
Interresting, but i don't know how to bankswitch ||
 
GarouSP said:
Interresting, but i don't know how to bankswitch ||
Click to expand...
First, burn the 27c160 with a file that join P1 version 1 and P1 version B.
Then you solder the 27c160 with the A20 pin in the air.
Get a 2 positions (3 pins) switch: pin A20 will be connected to middle pin of the switch. Connect the other 2 pins of the switch to GND for one and 5V for the other.

That's all.
 
GarouSP said:
No deal, got the cross hatch screen, I’m blanking the eprom to try again later, any tips for this??
Click to expand...
Use romwak to double the rom.
Dump the file and check the CRC before soldering it in the PCB.
If it does not work then P2 is busted too.
 
Misos said:
Use romwak to double the rom.
Dump the file and check the CRC before soldering it in the PCB.
If it does not work then P2 is busted too.
Click to expand...
I used copy /b to double the rom, when I tried with 27c322 the game booted but I got only big colored squares.
My 27c160 came yesterday and I didn't erase it, I just program and put on the board, I don't know if my eprom programmer was the problem, it'a TL866 with an adaptor.
Anyway I put the eprom to erase and later I will try again.
Thanks for helpin me!
PS: Checking CRC of a doubled rom the result should be the same of the original file?
 
GarouSP said:
I used copy /b to double the rom, when I tried with 27c322 the game booted but I got only big colored squares.
My 27c160 came yesterday and I didn't erase it, I just program and put on the board, I don't know if my eprom programmer was the problem, it'a TL866 with an adaptor.
Anyway I put the eprom to erase and later I will try again.
Thanks for helpin me!
PS: Checking CRC of a doubled rom the result should be the same of the original file?
Click to expand...
It should be the same as the doubled file.
You can use Romwak or the cmd method both works fine.
 
Tried romwak and copy /b but I can’t get the same crc for both files, at least not the same md5, winrar crc32 not the same crc too
 

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Game booted now, but plays blind….
Sometimes a image appears then the game resets, sometimes no image at all and after demo the game resets.
When I put a credit I can start the game but the game freezes at character select, I know this by the sound.
Should I try to program the eprom again?
Maybe P2 or another mask rom with problem?
 
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I can check but I think that the crc would be different, it’s not the original rom.
Ps: I forgot to jumper JB3 but only this time,yesterday I jumped JB3, got do it and post the results here, maybe one day I forget my head at home…..
 
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