> 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.

There was one version of one of the CBM disk drives (I think it was the 8252LP) where a 6530 was replaced by a daughtboard containing (I think) an 6532 + a ROM + TTL glue. I don't know how universal that solution is, but I guess something could be worked out.