41CX plug-in modules

[Garth Wilson]

MAOstrov, you might be thinking instead of the Extended I/O module, not the Extended-Functions/Extended-Memory module. The HP-IL module gives you all the basics, but the XIO's added functions definitely improve the capability and flexibility. I bought my HP-IL and XIO modules merged from the start, ie, the XIO module was built into the HP-IL module (so the two together only take one port), before I ever saw it; so I tend to forget which module the various words are in.

In many cases, you won't absolutely need a module that may initially sound necessary; it's just that the module offers advantages. For example, there's a module for using the HP3421A data-acquisition unit with the 41, but it's really just to keep you from having to look up individual 3421 commands, IIRC. I used the 3421A at work for a while in the 1980's I did fine without the module.