The biggest change is the amount of memory management overhead.
When we brought up the MPC support we discovered that for code to
be effective we needed to exercise a lot of attention to detail especially
in conditional branches and calls where the W cannot be changed without
changing the STASTUS and as many as three ROM memory
management bits need to be changed (5 instruction conditional).

Walter Banks
http://www.bytecraft.com


> I am considering migrating to the '77from the '74. Are there
> any 'undocumented features' that any of you have discovered on
> it?
> Does the Usart work properly?
> Are there any funny IO effects?
> Does the brown-out actually work (every time)?
> Do you have lead-time problems (16C77-04 IPQ)?