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A Big database for small calculators.

Last database update :
04-21-2014


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Pictures Model Aka Version Intro date End date Type Last update Progr RAM ROM Nb functions Alpha Nb keys Display type Display Graph XY Ext Print Sav Clock             Microprocessor                                     Functions                         Size Weight Batteries Ext power Power Twin Made in Link(s)                                                 Remarks                                                



   Keystone

Some models are also named Berkey Keystone. Berkey 2 Keystone Place Paramus, New Jersey USA.
Pictures Model Aka Version Intro date End date Type Last update Progr RAM ROM Nb functions Alpha Nb keys Display type Display Graph XY Ext Print Sav Clock             Microprocessor                                     Functions                         Size Weight Batteries Ext power Power Twin Made in Link(s)                                                 Remarks                                                
88  c1974-75 4 funct2009_04_13N0 5N18Panaplex8NNNNN %133x81x? 4xAA5VDC     
98  c1974-75 4 funct2010_02_14N1 5+2memN20VFD Orange8 1/2 + 1ledNNNNN % MR MC133x81x41260grsealed10.6VAC  USA  
108  197x 4 funct2009_04_13N1 8+1memN22Panaplex8NNNNN EX Sqrt +/- % M133x81x? sealedY     
ATLAS-RAND  197x 4 funct2009_04_13N0 5N18Panaplex8NNNNN %  4xAAY     
350Berkey Keystone 197x 4 funct2009_04_13N0 5N18Panaplex NNNNN %  YY     
370  197x 4 funct2011_05_27N0 5N18VFD ?8NNNNN %133x81x? sealedY  USA  
390  <=1973>=19734 funct2009_04_13N1 5+2memN20Panaplex8NNNNN % MR MC133x81x? 4xAA sealed10V6AC     
395exponent 1 <=1974>=19744 funct2009_04_13N1 8+1memN22Panaplex + 1led8NNNNNRockwell A1241PAEX Sqrt +/- % M133x81x? 4xAA sealed10V6AC     
2010  197x 4 funct2009_04_13N0 7N20Panaplex8NNNNN +/- EX %140x81x? 2xAA2V5DC     
2030Berkey Keystone 2030 1975 4 funct2009_04_13N1 7+4memN24Panaplex8NNNNN +/- EX % M+ M- MR MC159x83x38 sealed6V9DC     
2040  c1975 4 funct2009_04_13N1  N VFD ? NNNNN %152x81x? sealedY     
2050  1974>=1975Scient2009_04_13N1 18+1memN30Panaplex8NNNNN Rockwell 15473PAsin asin cos acos tan atan EX e^x LN X^2 LOG Sqrt +/- Pi M171x85x35 sealed6V9DC     
SC 650  197x 4 funct2011_05_27N0 7N20Panaplex8NNNNN +/- EX %140x81x? 2xAAY  USA  
SC 652  197x 4 funct2009_04_13N1  N VFD ? NNNNN %152x81x? sealedY     
SC 654  197x 4 funct2009_04_13N1  N VFD ? NNNNN %152x81x? sealedY     
SC 656Berkey Keystone SC656 197x Scient2010_09_29N1 18+1memN30VFD8 1/2NNNNN sin asin cos acos tan atan EX e^x LN X^2 LOG Sqrt +/- Pi M152x81x? sealedY     



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Copyright : all the pictures are my property. You can copy and save them but strictly for your own purpose. You are not authorized to modify, diffuse or use them (even partially) for another internet site, or for all other puplic diffusion. You are authorized to create links to MyCalcDB site, but I cannot garantee their reliability in the time. What I can garantee (exept errors) is only the database calculator's id number (for example: id=777 for the HP-55).