NEO-257: Difference between revisions
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*A*,B*: Inputs | *A*,B*: Inputs | ||
*Y*: Outputs | *Y*: Outputs | ||
*Select: Output A if | *Select: Output A if LOW, B if HIGH. | ||
*Some pins marked as ground could be "enable" pins | *Some pins marked as ground could be "enable" pins | ||
[[Category:Chips]] | [[Category:Chips]] | ||
Revision as of 09:49, 7 May 2011
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.
- A*,B*: Inputs
- Y*: Outputs
- Select: Output A if LOW, B if HIGH.
- Some pins marked as ground could be "enable" pins