HP-41 MCODE, unused bits in chip 0

[Sylvain Cote]

(06-11-2017 05:22 AM)hth Wrote:  1. Are there other modules apart from ZENROM that use these bits?

I do not know

(06-11-2017 05:22 AM)hth Wrote:  2. How popular is ZENROM these days, do you use it?

Yes, frequently, MCED & RAMED are my go to interactive debugging functions when I need to inspect something in memory.

Sylvain