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Additional Pictures 

 

Different font sizes found on an early SR-51 (TOP, Serial No. 0001589)
and a later SR-51 (BOTTOM, Serial No. 0044521).


 
The printed circuit board (PCB) of an early SR-51 gives production codes 
of week 42 year 1974 on the SCOM chip holding the firmware! 


horizontal rule

If you have additions to the above article please email: joerg@datamath.org.

© Joerg Woerner, July 14, 2002. No reprints without written permission.