On 02/09/2018 10:57 AM, Warner Losh via cctalk wrote: > For those that don't want to read through the entire datasheet, > https://electronicerror.blogspot.com/2007/08/undocumented-flags-and-instructions.html > has a good summary.
RIM and SIM were always documented for the 8085. Not doing so would have made it difficult to use the added features, such as "half" and TRAP interrupts, in addition to bit-bang serial I/O. In the Calmos document cited by Al, the discussion of added flags and instructions begins on PDF page 39 and is much clearer. --Chuck
