DATAMATH  CALCULATOR  MUSEUM

Additional Pictures 

 

 The minirex 75 on the charging craddle.

 The PCB's of the minirex 73 (left), minirex 74 (middle) and minirex 75 (right). 

The minirex 73 uses a US-built AMI S2144, a copy of the MOSTEK MK5020A. 

The minirex 74 uses a GDR-built U820, a copy of the Texas Instruments TMS0105.

The minirex 75 uses an original calculator chip, the TMS0105.


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

Joerg Woerner, May 23, 2002. No reprints without written permission.