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Zepper
 Post subject: Gradius II dump?
PostPosted: Wed Dec 14, 2016 12:53 pm 
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Board pictures. A pirate cart with cheating.


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lidnariq
 Post subject: Re: Gradius II dump?
PostPosted: Wed Dec 14, 2016 12:54 pm 
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It's a VRC2 with a pirate IRQ.

... Wait, that looks really familiar.

'cuz it is...
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Zepper
 Post subject: Re: Gradius II dump?
PostPosted: Wed Dec 14, 2016 3:45 pm 
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Fine. How could I dump it with kazzo? Is possible to do it?
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lidnariq
 Post subject: Re: Gradius II dump?
PostPosted: Wed Dec 14, 2016 3:49 pm 
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Dump it as though it were the ordinary licensed VRC4 Gradius 2. CHR is identical and PRG will only differ in the last 2 KiB.

Sorry, I should have actually looked at my traces from when Fisher asked; it's actually VRC2b layout.

However, it won't work in any emulator. There's no mapper allocated to this board.
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zxbdragon
 Post subject: Re: Gradius II dump?
PostPosted: Wed Dec 14, 2016 7:16 pm 
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lidnariq wrote:
Dump it as though it were the ordinary licensed VRC4 Gradius 2. CHR is identical and PRG will only differ in the last 2 KiB.

Sorry, I should have actually looked at my traces from when Fisher asked; it's actually VRC2b layout.

However, it won't work in any emulator. There's no mapper allocated to this board.


dumper and read eeprom,The data is different.
dumper:data is 2k patch to PRG, ROM size :128+128
eeprom:ROM size :2k patch+128+128

all G2 pirate working my build nestopia plus! r314
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Fisher
 Post subject: Re: Gradius II dump?
PostPosted: Sun Dec 25, 2016 6:06 am 
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Location: -29.794229 -55.795374
First of all, MERRY CHRISTMAS!!!

I have a pirate "Kid Dracula" (Akumajou Special: Boku Dracula-kun) that runs on similar hardware.
Is ROM dumping / PAL dumping / scanning worth the effort?
I mean, can this really help documenting and further understanding the hardware?

Does your cartridge have the same bug as mine?
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zxbdragon
 Post subject: Re: Gradius II dump?
PostPosted: Sun Dec 25, 2016 8:21 am 
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Posts: 430
Fisher wrote:
First of all, MERRY CHRISTMAS!!!

I have a pirate "Kid Dracula" (Akumajou Special: Boku Dracula-kun) that runs on similar hardware.
Is ROM dumping / PAL dumping / scanning worth the effort?
I mean, can this really help documenting and further understanding the hardware?

Does your cartridge have the same bug as mine?


Akumajou Special: Boku Dracula-kun..... I DUMPED,but IRQ not emu

you can dumped 16L8AN?
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Fisher
 Post subject: Re: Gradius II dump?
PostPosted: Sun Dec 25, 2016 9:18 am 
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With Lidnariq's help, I have read the PAL chip as an EPROM.
Later he figured out the logic on the IC based on the data.
I see no reason this could not be made again with this other PAL.

Should I? I think I will!!
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lidnariq
 Post subject: Re: Gradius II dump?
PostPosted: Sun Dec 25, 2016 11:15 am 
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If you want to build a generic harness for dumping PAL16L8, connect pins 13-18 to your ROM reader data lines, but also put ≈4.7kΩ resistors from your ROM reader address lines to those six pins.
This will let the address line drive the pin if the PAL is configured to have the pin be an input, but will let the data line be read if it's an output.
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Fisher
 Post subject: Re: Gradius II dump?
PostPosted: Sun Dec 25, 2016 3:19 pm 
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Location: -29.794229 -55.795374
Do you mean like this?
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zxbdragon
 Post subject: Re: Gradius II dump?
PostPosted: Sun Dec 25, 2016 3:52 pm 
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Akumajou Special: Boku Dracula-kun


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Zepper
 Post subject: Re: Gradius II dump?
PostPosted: Sun Dec 25, 2016 3:54 pm 
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Back to the subject... :| :|

So, it's NOT possible to dump it with Kazzo because of this extra chip/data?
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zxbdragon
 Post subject: Re: Gradius II dump?
PostPosted: Sun Dec 25, 2016 4:02 pm 
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zxbdragon
 Post subject: Re: Gradius II dump?
PostPosted: Sun Dec 25, 2016 4:03 pm 
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Joined: Mon Dec 12, 2011 8:15 pm
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lidnariq wrote:
If you want to build a generic harness for dumping PAL16L8, connect pins 13-18 to your ROM reader data lines, but also put ≈4.7kΩ resistors from your ROM reader address lines to those six pins.
This will let the address line drive the pin if the PAL is configured to have the pin be an input, but will let the data line be read if it's an output.

this cart 16l8an+ax580c ,VRC4 +IRQ?
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Joe
 Post subject: Re: Gradius II dump?
PostPosted: Sun Dec 25, 2016 4:30 pm 
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Joined: Mon Apr 01, 2013 11:17 pm
Posts: 437
Zepper wrote:
So, it's NOT possible to dump it with Kazzo because of this extra chip/data?

It is possible. Use VRC2b.
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