PN 80-153
Five IC’s on a SBC: 6502, 6522 VIA,  2716 EPROM, 2x 2114 SRAM, 74LS10 decoder

PCB images by Glen Deas, thanks!

(Clock modification with crystal,  Don Sawyer)

This is a revision, connecting phi2 to pin 11 of the ‘LS10, “to improve memory response”, so the wire is soldered!