These chips are pre-programmed and out of the packet they work great on Corona boards giving you decent boots times, they do not work on Trinity boards as they are, however, timing files have been released to allow you to program them to work with RGH1.2 and they will boot the console instantly, to program them you will need to swap two wires around on the chip programming cable as the pinouts on these chips are slightly different.

Using these as they come are quite easy to install and the great thing is, it makes them ideal for use with the Deluxe MTX SPI nand flasher which do not program chips natively and are a lot cheaper than other programmers, great if you are only doing the one console, happens to be a Corona and you want to save a few £££.

You may also need a postfix adaptor, a good indicator to needing one are any of the resistors R2C6, R2C7 & R2C10 missing, for a definitive answer, remove the heatsink and visually inspect to see if there are traces going to post.