Abstract: A hand-held electronic game machine includes a computer accommodated in a case and a liquid crystal display (LCD) panel provided at an upper portion of a front surface of the case. When an external memory is inserted to a receiving port formed on a rear surface of the case at a portion opposite to the LCD panel, a first character data being set in advance in the computer is compared with a second character data stored in a predetermined area of the external memory. Prior to such comparison, the computer displays the characters represented by the second character data on the LCD panel. If the first and second character data are coincident with each other, the computer can access to the external memory.

Abstract: An electronic gaming (e.g., video game) device includes a pseudo-stereo sound generator. Plural independent sound generating circuits produce audio signals under microcomputer control. The microcomputer may route the outputs of the plural sound generating circuits independently to one or the other (or both) of two independent audio channel outputs so as to produce pseudo-stereo sound. A selecting circuit automatically mixes the two audio channel outputs together and provides them in monaural form to an internal loudspeaker when no stereophonic headset is connected. A microcomputer controls generation of sounds and music in accordance with a musical pitch (frequency) data structure, a musical duration data structure and a musical score data structure stored in an interchangeable memory cartridge. The musical score data structure specifies pitch and duration in terms of address offsets into pitch and duration data structures.