Recently I have become aware of a fault in all NESRGB boards shipped between 15th and 23rd of January 2014.
The latest batch of NESRGB boards have a new RAM chip, the
previous boards used a
two parts are functional equivalents, however, the use of AS7C3256A-12TCN
a subtle bug in the program. The background colour value is not updated in
Faulty board operation. The background is grey in many games:
By removing the AS7C3256A-12TCN and soldering a CY7C1399BN-15ZXI in its place, correct operation will be restored.
This solution is only suitable if you are skilled at SMT soldering. If you have never soldered SMT parts before please do not attempt this procedure.
To remove the old RAM chip:
To solder on the new RAM (CY7C1399BN-15ZXI) chip:
See the software page for programming details.