Compuprint 9058 Programmer Manual Manuel d'utilisateur Page 139

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The Parallel Interface
A78408098-003
C.10
1284 Active (NSelectIn)
Compatibility Mode: Set low by host to select printer.
Negotiation Phase: Set high in conjunction with Host Busy being
set low to request a 1284 mode.
Reverse Data Transfer
Phase:
Set high to indicate that bus direction is printer
to host. Set low to terminate 1284 mode and
set bus direction host to printer.
Reverse Idle Phase: Same as Reverse Data Transfer phase.
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