Things are tough right now ...

They're tough for everyone :( But when coronavirus hit here in the UK, the museum had to close its doors to the public, and we lost practically all our income overnight.

Please Donate Via Just GivingNo visitors, no workshops, no events, no school visits... no income. We know that things are tough for everyone right now, but if you can afford to help us through these tough times please donate what you can.

Stay safe, stay at home! There's over 36,000 exhibits here! That should keep you occupied for a bit - get searching!

Or come and get involved on our social media channels ...

        Twitch   Facebook             Online Gift Shop   

Thank you.

ICT Type 550/2 Electronic Calculator

ICT Type 550/2 Electronic Calculator and Type 239/2 Gang punch
Field Engineering Manual TLS-001-1
1964

The Type 550/2 Electronic Calculator is a major item in the range of 80-column Data Processing Equipment. It can be programmed to carry out a wide range of calculations incorporating addition, subtraction, multiplication and division.
-
The Two Units
The electronic calculator is composed of two units, the gang punch (Type 239/2) and the calculating unit.

(a) The gang punch provides the input and output facilities for the equipment. Information to be processed is read from punched cards and transferrec?to the calculator. The results of processing are punched either into the same cards or into specially desig- nated cards atthe punching station of theType239/2 Gang Punch.

(b) The calculating unit converts, stores and processes the informa- tion read by the input and passes the results back for recording in punched card form.
Data is processed according to instructions drawn from control panels which are quickly interchangeable. The program of processing is determined by plug wires inserted into these panels by the operator.

Operations are carried out, within the program capacity of the madhine, at a speed of 6,000 card passages an hour, regardless of the complexity of the calculations. 50 program steps (200 primary cycles) are available for each card.

kindly donated by Julia Haylett on behalf of her husband Albert John Haylett who worked for ICT


Reference Number :

Date Published : 1964

Manufacturer : ICT

Platform : 550/2

 

 

 

 

 

This exhibit has a reference ID of CH10778. Please quote this reference ID in any communication with the Centre for Computing History.
 

ICT Type 550/2 Electronic Calculator

Click on the Images For Detail






Help support the museum by buying from the museum shop

View all items

Founding Sponsors
redgate Google ARM Real VNC Microsoft Research
Heritage Lottery Funded
Heritage Lottery Fund
Accredited Museum