Excel-ASM16 features 24 different case-insensitive instructions. There are three different operands that are used in each instruction REG ; refers to any of the 16 general purpose registers E.G. R0, ...
For a bit of context, Excel's XLS file format dates back to 1987. It was superseded by XLSX in 2007. Had this been used, it would have handled 16 times the number of cases. At the very least ...