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AGCRetrogaming

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Hello everybody

I do appreciate if someone can support me in this case, I'm trying to fix my sound rom in CPS2 - MVC B-Bord with eprom NEC D27C1000A-12 and I'm using the GQ-4x4.
I tried to use the generic device 27C1000, and other as 27C1001A, 27C010 but no success.

No I'm stuck to get this done.
Thanks everyone.
 
27C1000 is a non JEDEC EPROM, 010/1001 are JEDEC type. These are NOT compatible with each other so you need to use a 1000 if that's what was there.

Your GQ-4X should be able to burn it fine as a 27C1000 generic, but you need to make sure your EPROM is fully and properly erased or it won't write.
 
Hi xodaraP, thanks for the feedback, but yes is in there 27C1000 but still not writing with NEC D27C1000A-12 and also apparently I can read and check if is blank but I can't verify and write.
 
You need to be using an external power supply, USB won't provide enough to burn a lot of EPROMs.

Also, is the 27C1000 on the board factory? I have 3 CPS2 boards deshelled at the moment and all 3 have 27C010 type EPROMs for the Q-Sound
 
http://wiki.pcbotaku.com/wiki/CPS2_Eprom_and_Jumper_details
  • location 1 & 2.
  • Eprom size is always 128kb/1mbit.
  • Function of pin 2 can be either A16 or GND.
  • Function of pin 26 can be either A16 or GND.
To use a 27c1001/27c010, A16 goes to pin 2 and GND 26 - this translates to a COOC (closed/open)configuration for JP1,2,3,4 and JP5,6,8,9.

I would go by jumpers to determine replacement. NEC may not have been as consistent as ST or AMD with numbering, and I've never had luck with some of those odd pulls from random chip manufacturers reprogramming.
 
I was actually just looking at this earlier, I thought the jumpers determined size but it actually makes sense they determine JEDEC/non JEDEC type
 
Also found this on the After Burner Enhanced webpage:

AEE said:
If you are using a GQ-4X, when programming NEC 27C1000 EPROMs, use the M27C1000 setting and run a link from ZIF socket pin 2 to A16.
 
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