HP-41 MCODE, unused bits in chip 0

[Ángel Martin]

(06-11-2017 05:22 AM)hth Wrote:  I have some need for at least one unused bit in chip 0 (the status registers).

I am thinking of using the 2 unused key assignment bits that belong to the second half of the ENTER key. These are the MSB in nibble 7 of register 10 and 15. It seems the ZENROM uses these bits.

I have two questions:

1. Are there other modules apart from ZENROM that use these bits?
2. How popular is ZENROM these days, do you use it?
   

Håkan

I'm not aware of any module using them - but then I didn't know the ZENROM did either, so not sure this is a valuable input.

I never use the ZENROM, the AMC_OS/X and other advanced modules do all the power use I need.

Cheers,
ÁM