Hi Paul! Thanks! Yes, the S-100 Z80 CPU V2 is a respin to include new features. I don’t think there were any big fixes but we did tweak a few things to improve flexibility. The ROM is now a larger size for an improved debug monitor while keeping the small 4KB region. There is a new CPU clock jumper to get external clocking for V9938 or TMS9918 synchronization.
It is mostly just an update and refresh of the existing design. It was pretty solid from the beginning so not much is needed. It is solid enough to be useful as a tool for debugging the other CPU and peripheral boards.
Thanks and have a nice day!