Sequential access memory for e.g. printer, has output buffer, central unit and comparator for allowing memory to effectuate reading of plane memory while preventing data read in plane memory from being applied on input/output

摘要

The memory (MEM) has a comparator, an output buffer, and a central unit preventing execution of read or write command if high order address of extended address is different from that of high order address allocated to the memory. The buffer, the unit and the comparator are arranged to allow the memory to effectuate reading of a plane memory (MA) while preventing data read in the memory (MA) from being applied on serial input/output. An independent claim is also included for a method of manufacturing a plane memory addressable with an extended address.