NOV CHAP XROM Number question

[BitWiz]

I am making sure I don't duplicate an XROM numbers and when I looked at the NOV-CHAP.ROM file from the Clonix-Nov_Upgr_20201016.zip file the first word of the ROM is 0x01F (XROM 31). I confirmed this with the ROM2RAW program.

However, the NOV CHAP ROM manual (https://www.google.com/url?sa=t&source=w...XMGfHuYIPW) says the XROM # is 16. Also the .ROM in that repository also has the XROM # of 31.

Is the manual incorrect or am I interpreting the first word wrong?

As usual, thank you.

Mike