So I ordered one of the NVRam DMD+ chips so that I can pull the batteries from my board and not have to worry about it. It appears there are two memory controllers on my CPU board. I labeled them A and B in the picture attached. First, can someone tell me which of these I will need to replace? I believe it is A, but want to make sure before I cause any problems. Total newbie question I know.

Second total newbie question - there are some updates to the ROM firmware which I think would be beneficial (ability to bypass OPTOs when they go out, etc) so I have ordered a set of ROMs from someone who burns them. It was listed as 'Stern Pinball Roller Coaster Tycoon ROM Upgrade Set CPU 7.02 Display 7.01'

I am assuming that my labeled C and D chips are the CPU and display ROMs that I will be replacing? I feel dumb asking, but I don't want to plug anything in the wrong slots and cause problems.

Thank you!
Adam

IMG_3838.jpg

(also notice my missing Q5 transistor. Hopefully that will be replaced tomorrow with great success!)

Ok thank you! I totally brain-farted on marking the sound chip as D. That makes perfect sense.

Thanks guys! And to answer flecom, I ordered both - an NVRAM replacement so I can pull the batteries, and updated display and CPU ROMs as the machine currently has the base / original chips and reviewing the changelog there are a number of things that will be nice to have / fix.

It's kinda funny to me that this is a 2002 board, but I feel like I'm working on an old 286 computer again as a kid. Just missing some SIPPs

But of course this all depends on my soldering the new replacement transistor in later today, and not blowing everything up to begin with!