(Topic ID: 240985)

Williams System 6 6802 mod... remove BOTH rams (IC 13 & IC 16)?

By pinball-museum

39 days ago

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  • Latest reply 39 days ago by pinball-museum
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#1 39 days ago

This removes a RAM at IC 13 but does this ALSO remove the 2nd RAM at IC 16? There are two next to each other and the same kind. I want to eliminate both if possible which is why I am asking. The following information states the removal of the RAM at IC 13 but does not speak of IC 16. It seems like it would make sense for both of them to be eliminated as it seems like they work together.

These are NOT the CMOS RAM, that is at IC 19.

As per PinWiki:

"The typically stuffed 6808 microprocessor can be replaced with the more easily obtained 6802 microprocessor. The 6802 uses the same instruction set architecture and pinout, making it "backward compatible" with the 6808. The 6802 incorporates an internal 128 x 8 bit RAM memory. With the proper strapping, the 6810 RAM located at IC13 may be removed when a 6802 is installed. Factory strapping grounds pin 36 of the 6808/6802 socket via jumper J1. Pin 36 must be pulled high by tying pin 36 to 5V via a 4.7K pullup resistor. This enables the 6802's internal RAM. The 6810 at IC13 can then be removed or (if not socketed) simply left in place.

- Replace the 6808 with a 6802
- Remove jumper J1
- Install a 4.7K resistor at R4"

Can I also remove IC 16 completely just like IC 13?

#2 39 days ago

No, the 6802 internal RAM only replaces IC13. IC16 is still needed with a 6802.

#3 39 days ago

That's too bad. I guess if I'm going to order one RAM and socket I might as well just order 2 and save my money on buying a 6502.

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