The Memory Modules (HP-41C Only)
Memory modules added RAM main memory to the calculator, allowing more programming steps and/or more data registers.
The original HP-41C had a main memory of 63 registers of 7 bytes each. Each register could hold either a number, a 6-character string, or up to 7 program steps in the Focal language (program steps used a variable number of bytes).
Each memory module added 64 registers, and the calculator could hold up to 4 of them, for a grand total of 319 registers. While this was considered huge for the time (a little more than 2 kilobytes,) all expansion slots were used. User groups found a way to merge two memory chips in a single module, thus freeing two expansion slots. HP designed a module holding all four in one slot, the so-called Quad Memory Module. The later HP-41CV had the quad module built-in.
Read more about this topic: HP-41 Extension Module
Famous quotes containing the word memory:
“With memory set smarting like a reopened wound, a man’s past is not simply a dead history, an outworn preparation of the present: it is not a repented error shaken loose from the life: it is a still quivering part of himself, bringing shudders and bitter flavours and the tinglings of a merited shame.”
—George Eliot [Mary Ann (or Marian)