Electromechanical calculating machines from the 1960's
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Rotary calculators

Printing calculators
Friden 1217
Lagomarsino Totalia S4GT
Marchant 416-S
Monroe 570
Monroe 580
Monroe Mach 1.07
Monroe PC-1421
Olivetti Divisumma 26
Olivetti Logos 27-2
Olivetti Tetractys
Precisa 166
Victor 73-85-54
Victor 79-88-54
Victor 10-871
Walther Diwa 32

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Other calculating devices

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Wanted

  
Monroe 580        
 
Manufacturer
   Monroe International Corp.
Orange, New Jersey, USA
 
Mechanism
   oscillating rack
 
Capacity
   12 x 10 x 21
 
Years produced
    
 
Price when new
   $1050 in 1968, $950 in $1969
 
Size (W x D x H)
   in.
cm.
 
Weight
   lb. oz. (kg)
 
Features
   high speed multiplication and division
automatic decimal point placement
back transfer
  click on photo to enlarge    
         
This machine is a refinement of the Monroe PC-1421, with many of the early teething troubles resolved. This machine is a few inches longer than the PC-1421, with the extra space added in front of the keyboard. This was possibly to allow for remote solenoid control of the machine – an option that was never realized in production. The half-cent roundoff option from the PC-1421 is standard equipment on this machine. Although a button is labeled “memory”, it only allows direct access to the control register, so it would be useless for any memory problems with require intermediate multiplication. (Svc Manual)