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Hardware Detail

Item Reference:
HW0609    
Machine Type:
TROS
Serial Number:
  Transformer Read Only Storage - TROS
  As part of the development of the System/360 Model 40 in Hursley, the concept of the SCAMP TROS, the first read-only storage device used in an IBM computer, was further developed into this simpler transformer read only storage unit. The device was used to facilitate emulation of the older 1401 and 1410 computers in addition to the basic Model 40 control functions.

The unit contains 128 flexible circuit strips that make up 60 transformers, with a capacity of 256 words of 60 bit length. The strips could be replaced if one became defective. The old one would be removed, small holes punched in the printed circuit lands in the same places as the original, to represent the bit pattern, and the new one inserted in the correct position.

An explanation of how TROS worked can be found here.
Date of Origin:
Donor:

TROS

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TROS

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Location:
On Loan - Manchester Contact Details: Manchester Until: 0