GQ-4X: Difficulty reading 32Kbyte masked ROMs?

MajorHavoc

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Reading the ROMs on my Marble Madness cart. Majority are masked ROMs and a few AMD EPROMs. The 16Kbyte read just fine.

The two masked ROMs that are 32Kbyte (201_E13 AND 202_D13) will not read as generic 27256 or 27C256. I can read the first half of them if I read them as 27128s.

Any ideas? I have no desire to drag out my Data I/O this evening! :)
 
Reading the ROMs on my Marble Madness cart. Majority are masked ROMs and a few AMD EPROMs. The 16Kbyte read just fine.

The two masked ROMs that are 32Kbyte (201_E13 AND 202_D13) will not read as generic 27256 or 27C256. I can read the first half of them if I read them as 27128s.

Any ideas? I have no desire to drag out my Data I/O this evening! :)

42 people look at this and still no response.

*FrEe BuMp*
 
Reading the ROMs on my Marble Madness cart. Majority are masked ROMs and a few AMD EPROMs. The 16Kbyte read just fine.

The two masked ROMs that are 32Kbyte (201_E13 AND 202_D13) will not read as generic 27256 or 27C256. I can read the first half of them if I read them as 27128s.

Any ideas? I have no desire to drag out my Data I/O this evening! :)

Do they show up as some pins not connected? If so, does your reader have an ignore option?

On my reader (TOP2049) I can ignore the pins not connected message and it still reads the chip.
 
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