Model:-97S, differences from -97AGeneral:Name:I/O CalculatorCode-Name:RicochetFamily:TopcatFirsts:serial output, last TopcatIntroduction:Date:1977-12-1Price:$1375Discontinuation:Date:?Price:?Production-Run:?Physical:I/O-Ports:BCD serial input/ 4-bit output, compatiblewith TTL, DTL, CMOS, NMOS, and high-thresholdlogic familiesTemperature-Range:Operating:10 to 40 deg CCharging:10 to 40 deg CStorage:-40 to 50 deg CNotes::This model was designed at HP Fort Collins, Colorado and notCorvallis.  The code name referred to bouncing data in and out.Claimed 3-6 hours of use from a full charge.  Recharge times: OFF 6hours, ON 17 hours.(The notes do not attempt to supply all line definitions and signaltiming information.)Binary input values equate to instruactions as:000000001100102001130100401015011060111710008100191010.1011EEX1100ENTER^1101A (as in continue at label A)1110CHS1111no-opNote that the assignment of 1111 to no-op means that unused lineblocks can be left unconnected.Flags 0-3 are output.  All flags are controlled by their respectiveSF/CF instructions.  In addition, flag 3 is set by the machine ifdata entry is detected from the keyboard, so a clear flag 3 after anA instruction means that input was from the serial interface.  Notethat this flag setting does not alter the value output on the F3-line.Connector is a 50-pin telephone-type.  Pinout is:GND126LE-F3-227LOAD-F2-328INHIBITF1-429LOADF0530T/C-I1631J1I2732J2I4833J4I8934J8G11035H1G21136H2G41237H4G81338H8E11439F1E21540F2E41641F4E81742F8C11843D1C21944D2C42045D4C82146D8A12247B1A22348B2A42449B4A82550B8