> e.g. 8'b1101_1101 : leading width specifier, and the internal underscore which is ignored but provides visual clarity ... some of which were extensions provi

> e.g. 8'b1101_1101 : leading width specifier, and the internal underscore which is ignored but provides visual clarity ... some of which were extensions provided by Metaware's High C/C++ compiler back in the 1990s: 0x2x1101_1011 0x10x_bad_feed_face 0_777