This is done in the factory with an intermediate connector. The factory either did not install it or it has been removed - along with the DPDT interlock switch at the coin door. If I were a betting person I suspect it was never installed at the factory. I have an Indiana Jones (not mine) in my possession that has exactly the same thing. No intermediate connector and no DPDT interlock switch.

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You have a few more hacks to undo if you want to achieve factory nirvana.

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If you ordered a 62256, this is a static RAM (SRAM). You will still need batteries. You will have to remove the old IC to install the new one. It is recommended to install a socket. If you install a socket then it would be recommended to use a non-volatile RAM (NVRAM) rather than a SRAM. This obviates the need for the batteries. Note that NVRAM is usually a 6264 compatible IC and this means you will need to make the corresponding changes on the CPU board to change the configuration from 62256 to 6264. It is possible to purchase a 62256 compatible NVRAM. This would be FM18W08. Also note that if you purchase the FM1608 (DIP-28) from Marco these are recycled/recovered ICs that are original Ramtron brand and are USED. They are not new.

If you are installing a socket then get a 6264 and make the board modification to support 6264 instead of 62256.

• 62256 NVRAM = $39.95. Total = $39.95
• 6264 NVRAM = $24.95. 1.5k resistor = $0.01. Total = $24.96

Personally, I think that's a no-brainer. The FM16W08 is relatively cheap. The FM18W08 is much more expensive.

This board is a digital logic board. Every discrete resistor on the board is 0.25W (1/4W). The bussed resistors are probably 0.125W or 0.2W depending on what the production line had on hand.

I know you don't know what I consider normal specification but without a specification, I generally assume the power rating is 0.25W. You can always use a resistor with a higher power rating but those are often larger in size since they dissipate more energy (heat) and may not fit in the allocated space on the board.

0.125W (1/8W) resistors do exist but they aren't commonly used. Presumably because they are small and fat fingers (not yours specifically but as a generalization) don't like small things.

I believe Marco is the most expensive of any merchant selling these. Marco is often the most expensive of any merchant selling anything (pinball related). They do a great service by stocking a lot of things and their labeling is second to none. A great range of products and often a one stop shop for anything pinball. That's what you're paying for.

There are other merchants that do carry it but the definitive source is Mr. Pinball in Melbourne, AU. See https://shop.mrpinball.com.au/product/ic-wpc-asic/?currency=USD for the product.

These chips typically only get damaged when someone using the wrong tool tries to extract it from the PLCC socket. Sometimes, alkaline corrosion spreads to them as well.

How about posting an image of yours? Others can then inspect what you have and advise you on what to connect to where.

Small correction. The terminals are labeled NO/NC/C. The C is "common" not "ground". For those that are interested in learning more search for "spdt" or "1 form c".