NEO-257

Quadruple 74HC257 2-to-1 multiplexer with common select line, making 16 switches in one chip. Used in dual slot MVS systems to select one of the two C ROM (and S ROM ?) buses.

Select signal comes from one of the "SLOT" outputs of NEO-F0 ?

Pinout
Information provided by Channelmaniac.



OpenOffice Draw file:


 * A*,B*: Inputs
 * Y*: Outputs
 * Select: Output A if LOW, B if HIGH.
 * Some pins marked as ground could be "enable" pins