The KIM Clone is working nicely with the SD card system but a few small problems were found and are being addressed. One was simply a matter of needing 74HCT parts for some of the address decoding. Now I’m working on smaller issues, mostly software but at least two hardware issues. A RAM test was running for about 24 hours without errors and I leave the KIM Clone running most of the day, all day, giving me a lot of confidence that it’s stable. For those in the engineering business, we know that endurance testing is always a big deal, and getting through a long run time is very satisfying.