I just posted the first of many short instructional videos that cover specific mainframe instructions here. The link to it is on my assembler resources page here. The first video covers the PACK instruction. I’ll try to post one video each day, five days a week, so join in and learn assembly language one instruction at a time. Each video will cover instruction semantics, examples of using the instruction, and demo executions of the instruction in VisibleZ. The notes for each instruction are included in a Powerpoint document. You can already find some introductory assembler videos on the resources page. If you have an instruction you would like to hear about soon, drop me a line and let me know. I’ll try to build a video for it as soon as possible.