Ah ja. The hardest to find parts today are the 6530-x chips, a multi fonction chip with 1 K mask programmable ROM, mask programmable chip select, I/O lines, timers and 64 Bytes of RAM. They are only available by scraping a real KIM. The nearest replacement is the 6532, witch utilizes I/O, Timer and 128 Bytes RAM. The I/O is almost the same - just two pins have to be shortened, but the chip select is fixed and not equal to none of the 6530-x. I made a design for a KIM clone years ago, but I never did build it actualy. These 6530s are just hard to replace - and if I start to replace, I could also drop most of the other additional stuff not needed today, like cassete interface or 50 mA loop, exchange the direct controlled LED by some 'intelligent' ones and the and would be a 199x KIM but no replika ... So where is the sense... Gruss H. -- Ich denke, also bin ich, also gut HRK