Abstract: A read only memory system with replaceable units is provided in which the replacement units have a variable capacity. In addition, the system is sufficiently flexible so that a replacement unit substituted for an original unit may subsequently be removed from the system once and the original unit restored. The read only memory system has a fixed main read only memory with a plurality of addressable units of uniform capacity in combination with a substitute memory of a greater capacity than the addressable units. A control is provided with the capability of selectively disabling units of a fixed memory. It also can selectively enable a portion of the substitute memory and substitute the enabled portion for a disabled fixed memory unit. The control is also capable of selectively varying the capacity of the substituted enabled unit.

Abstract: A cathode ray tube display system is provided for displaying a block comprising a plurality of alphanumeric characters arranged in a plurality of character lines having cyclic refresh means wherein each unitary or whole character is refreshed before the next succeeding character is refreshed. The system comprises means for repetitive raster scanning of the CRT tube in a raster of horizontal passes each traversing the whole one of said character; each of these horizontal passes comprises a subraster of vertical scan lines wherein each character position in said character line being traversed is scanned by a group of these vertical scan lines, and means are provided for modulating the light intensity along the vertical scan lines of each of these groups to selectively provide an alphanumeric character at the position being scanned by the group of scan lines.

Abstract: This text processing and display system has the capability of effectively defining and rearranging the format of any selectable section of the block or page of alphanumeric data being displayed. The system involves the combination of a display device for simultaneously displaying a block or page comprising a plurality of lines of alphanumeric characters in ordered display position, with sequentially accessible storage means for storing coded data representations of the displayed characters in a sequence of storage positions spatially corresponding to the positions of the characters in the display block.

Abstract: Disclosed is apparatus for and a method of decreasing the time duration of playback of recorded speech without distortion. Speech recorded at a normal rate is played back at a higher rate using two variable length buffers in alternating fashion to receive sampled speech segments. Threshold analysis logic circuitry is provided to continually compare the output voltage levels of both buffers and to switch the output between the buffers to a using device when the voltage level of both buffers is approximately zero and of an equal amplitude. In this way output to the using device consists of segments from both buffers joined with a minimum of generated noise and no associated dead zone without regard to any predetermined segment length.

Abstract: Disclosed is apparatus for and a method of decreasing the time duration of playback of recorded speech without distortion. Speech recorded at a normal rate is played back at a higher rate using two variable length buffers in alternating fashion to receive sampled speech segments. Threshold analysis logic circuitry is provided to continually compare the output voltage levels of both buffers and to switch the output between the buffers to a using device when the voltage level of both buffers is approximately zero and of an equal amplitude. In this way output to the using device consists of segments from both buffers joined with a minimum of generated noise and no associated dead zone without regard to any predetermined segment length.