Ah; that may be a hint. The Z80MC runs *cold". Everything is CMOS, nothing gets hot.
What are you using for a power supply? Could its voltage be insufficient? USB supplies are often weak, and the cables so thin that they have lots of voltage drop. I haven't seen this problem with the Z80MC (which draws less than 100mA), but it often happens with the Altaid 8800 (which draws close to 500mA).
Lee
--
Excellence does not require perfection. -- Henry James
But it *does* require attention to detail! -- Lee Hart
--
Lee A. Hart
Lee Hart