Vintage Computer Festival Midwest 6.0 2011 Adding Machine

This is a glance at an electromechanical adding machine as part of the Vintage Computer Festival Midwest Version 6.0 and Emergency Chicagoland Commodore Convention held on Sept. 24-25, 2011 in Lombard, IL Input: rotary dials ALU: Strowger switches, step-by-step, SXS, stepping switches, or stepping relays Output: incandescent light bulbs Note: one of the light bulbs is burned out Vintage Computer Festival: Vintage Computer Festival Midwest: Chicago Class