EEPROM Programming Help

Sirsalt

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Hi,

I'm trying to update my Mr. Do's Castle to the "cherry" romset, and am having issues programming the D27128-3.

I'm using the GQ-4X, which I've had for about 3 years, and have programmed many ICs with.

This is the first one I've not been able to program. I have the GQ software updated to the current version, and the only device close to what I'm trying to program that comes up in the list is the D27128A.

I'm assuming there's a difference between the D27128A and the D127128-3 that's causing it to not program. There are 2 D27128-3 IC's on the the Castle PCB, and both will not program. They timeout at 1%. In the log I get an "ubable to get deviceID" alert.

I connected external power just to make sure it wasn't a power issue, and I get the same results.

Any help would be appreciated.
 
The 27128 is a 21Vpp device. The 27128A is a 12.5Vpp device.

I'm not familiar with the GQ-4X, but you need to set the programming voltage at 21V and then the timing algorithm for 27128A should work.
 
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