CheapNeoGeo
Kula's Can,
- Joined
- Mar 17, 2002
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- 311
Does anyone know what Video Ram Chips a Neo Geo MVS 4 slot uses?
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Video Ram
- Thread starter CheapNeoGeo
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Nightmare Tony
*Account control passed, on to Tony's family.Ex Ro
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- Sep 19, 2001
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The same as every other Neo Geo pretty much, two TMM2018s, aka CXK5814. This is assuming you are getting the 8000 video ram error.
CheapNeoGeo
Kula's Can,
- Joined
- Mar 17, 2002
- Posts
- 311
This is the error message it gives.
video ram error
address write read
00008007 5555 5545
The system that gives it I am looking to buy to see if I can not get it up and running properly and if I can't get it running I would have a spare one for parts. So I don't really loose out.
video ram error
address write read
00008007 5555 5545
The system that gives it I am looking to buy to see if I can not get it up and running properly and if I can't get it running I would have a spare one for parts. So I don't really loose out.
Nightmare Tony
*Account control passed, on to Tony's family.Ex Ro
- Joined
- Sep 19, 2001
- Posts
- 1,029
Ah, another internal RAM one. If it read 8000 straight, then it would be a snapped trace. Since it is 8 bytes into the RAM, the numbers tell me that bit D4 at location 0007 failed. So its interal to the RAM.
There will be two vdieo RAMs, marked TMM2018 or CXK5814. One of the RAMs is bad.
A little trick to tell you which it is, short out pins 13 and 14 one one chip, then turn it on. This will pull bit D2 to ground. When you turn it on:
If the 5555 reads 5554, then that is the bad RAM there. If it reads 5455, then its the other RAM.
Be sure and put sockets in their places, so they are easily replaceable. Power spikes usually zap these two most of the time.
There will be two vdieo RAMs, marked TMM2018 or CXK5814. One of the RAMs is bad.
A little trick to tell you which it is, short out pins 13 and 14 one one chip, then turn it on. This will pull bit D2 to ground. When you turn it on:
If the 5555 reads 5554, then that is the bad RAM there. If it reads 5455, then its the other RAM.
Be sure and put sockets in their places, so they are easily replaceable. Power spikes usually zap these two most of the time.