The Application Pacs
The ROM-based application 'pac' modules added up to 4 kilobytes of read-only memory (some up to 8 kilobytes, but these were simply two independent 4K modules in the same box). Most modules held dozens of programs written in the HP-41C programming language, Focal.
Programs in the ROM modules could be called from a user program, using the ubiquitous XEQ function. In the program code, XEQ appeared as "XROM" when it was used to call a ROM program.
Read more about this topic: HP-41 Extension Module
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—Albert Einstein (1879–1955)