IC memory card having start address latch and memory capacity output means

摘要

An IC memory card includes one or more memory devices for storing data, a memory latch for storing a start address set from outside of the card, a circuit for generating a signal representing the memory capacity of the card and for outputting the signal outside of the card, and a comparator for comparing the start address set in the memory latch with an address sent from an address bus and for making the data stored in the memory devices accessible from the outside of the card when upper bits of the two address are identical to each other. A computer system employing a plurality of such IC memory cards receives the memory capacities of the cards and assigns start addresses to the cards in sequence. Intervals between start addresses of cards adjacent in sequence are based on the memory capacities of the cards. Thus, a plurality of cards of varying memory capacities may make up a memory map having a continuous range of memory with no empty memory regions therein.