NEO-257: Difference between revisions
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[[File:Neo-257_pinout.png]] | [[File:Neo-257_pinout.png]] | ||
OpenOffice Draw file: [[File:neo-257.odg]] | |||
*A*,B*: Inputs | *A*,B*: Inputs | ||
Revision as of 00:43, 3 December 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.
OpenOffice Draw file: File:Neo-257.odg
- A*,B*: Inputs
- Y*: Outputs
- Select: Output A if LOW, B if HIGH.
- Some pins marked as ground could be "enable" pins