|NUT processor NOP's (beginner's question)|
Message #1 Posted by Diego Diaz on 9 May 2010, 1:42 p.m.
There are some words (mainly in the class 0) that NUT processor considers as NOP's.
Some of them have been used for different purposes, the most well known being ENBANK (H'100, H'140, H'180, H'1C0) and WROM (H'040).
Another two are used by HEPAX module: ROMBLK (H'030) and WPTOG (H'1F0).
Willian Doug Wilder's M-code table shows WREG0 to WREG7 (H'200, H'240, H'280, H'2C0, H'300, H'340, H'380 & H'3C0). Although I have been unable to find further references to their usage.
Still three words remain apparently unused: H'080, H'0C0 & H'2B0.
So my question is: Are they *really* unused? and, therefore, can any of them be used to extend the functionality of a new born module?
Your comments will be much appreciated.