Abstract: When a drop of the voltage of a battery is detected, a detector outputs two kinds of alarm signals in accordance with the degree of voltage drop. Two PALs for generating an alarm signal input the respective alarm signals to a selector. An alarm signal from another PAL which generates an alarm signal in accordance with the state of a panel switch and a sound signal from a speaker data generator which generates various sound signals in accordance with a signal from a CPU are also supplied to the selector. The selector selects one from these signals so as to drive a speaker. Since a means for generating an alarm signal is provided separately from the speaker data generator, an alarm sounding operation is ensured.

Abstract: An information processing apparatus includes a program memory (4, 40) and circuitry for switching mapping schemes so as to deal with both direct and bank mapping schemes without alteration of programs. The program memory (4) includes a first memory area (14, 15) formed of a plurality of memory blocks for storing a first program (100) for the bank mapping and a second memory area (16, 17) utilized as a memory block for storing a second program for direct mapping. In the bank mapping, each memory block is mapped into a same address area of an address space of the processor. In the direct mapping, the first and second memory areas are mapped in one-to-one correspondence into the address space. Alternative program memory (40) includes a first memory block (50) storing a first program and a second memory block (60) storing a second program. A predetermined identification information ("JA") is stored in a predetermined memory location of the second memory block.