Explanation Of I/O Signals - Toshiba 4560 Service Manual

18.12 Explanation of I/O Signals

18.12.1 REQ1, ACK2, ADFRXD signals
This is the communications input circuit for the main unit PPC. "1" indicates 5 V, and "0" indicates 0 V.
Connector logic and CPU input port logic are the same.
18.12.2 ACK1, REQ2, ADFTXD signals
This is the communications input circuit for the main unit PPC. "1" indicates 5 V, and "0" indicates 0 V.
Connector logic and CPU output port logic are the same.
Nov. 1997 © TOSHIBA 18 - 59 4560/4570 RADF