Apparatus for displaying at least two parameters of populations of particles on a cathode ray tube

Claim 1

Apparatus for displaying on a conventional cathode ray tube (CRT) with X-Y deflection circuits two parameters of populations of particles where said particles are being analyzed and/or sorted by apparatus which provides for each particle a pair of substantially concurrent analog signals representative of two properties of each particle of said populations comprising; analog-to-digital converter means for converting each of said analog signals to a digital number; a pair of digital storage means each with a predetermined amount of addressable storage locations for sequentially storing said digital numbers; means for overwriting, in the sequence in which stored, previously stored digital numbers when said storage is exceeded; means for reading said pair of storage means, including a pair of digital-to-analog converters for respectively receiving said stored digital numbers and driving the X-Y deflection circuits of said CRT; and including means for unblanking said CRT.