I have a Stern MPU-200 that has developed boot issues. Getting one flash which seems to point to the 6810 RAM chip. Removed and reseated the chip a couple of times while testing for successful boot on the bench, but no change. Stole a 6810 chip from another board and installed it, and the MPU-200 booted right up.

I'd like to replace the 6810 chip I borrowed. Checked the normal US sources and didn't seem to see any for sale. I did find them for sale at AliExpress (link at end of post).

Is there a better place to pick up a 6810 chip? Is there something else I can replace the 6810 chip with on the MPU-200 board?

https://www.aliexpress.com/item/Free-shipping-5pcs-lot-MC6810P-MCM6810P-DIP-new-original/32865753149.html?spm=2114.search0104.3.1.406f579ffDWW0X&ws_ab_test=searchweb0_0,searchweb201602_1_10065_10068_10130_10890_10547_319_10546_317_10548_10545_10696_453_10084_454_10083_10618_10307_538_537_536_10059_10884_10887_100031_321_322_10103,searchweb201603_51,ppcSwitch_0&algo_expid=c3ff037c-555f-4b0b-9de1-41cc2a91a651-0&algo_pvid=c3ff037c-555f-4b0b-9de1-41cc2a91a651

Thanks!. I see arcadechips.com carries a 1Mhz and a 2 Mhz version of this chip. Would either one of them work in early Stern SS games?

Also, does anyone know if there is something else I can replace the 6810 chip with on the MPU-200 board? lt would be nice to know if there is a substitute or not. I saw that with some of the sound boards one can swap out the CPU chip for one with some onboard RAM, and then with a jumper change it isn't necessary to use a 6810 chip at all. Anything like that on the MPU-200 board?