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Thank you, Alex this is it https://www.ultimateretro.net/en/motherboards/3134 I found pinout for the riser and will look for a suitable riser

I have Intel ADVANCED/RH system board without riser Please, help me with riser P/N, pinout, or PC model number. That board supports Pentium MMX and has ATI 264VT video, Intel 82439HX system controller, National PC87306 SuperIO. Riser connector has one key.