Specifications

Chapter 4 Hardware Reference
36 Users Guide ReadyBox
Parallel Interface
The ReadyBox provides a parallel port connector on the I/O panel with a 25-pin ribbon cable that
connects to the floppy/parallel connector on the specific ReadyBoard.
The ReadyBox provides the standard D-shell 25-pin (DB25) parallel connector, which supports the
following protocols:
• SPP (Standard Printer Port)
• Bi-directional SPP
• ECP (Enhanced Capabilities Port)
• EPP (Enhanced Parallel Port)
Refer to the specific ReadyBoard Reference Manual for more information and to the following table for
the parallel port pin assignments.
Table 4-2. Parallel Interface Pin/Signal Descriptions
Pin # Signal Description
1 Strobe* Strobe* – This is an output signal used to strobe data into the printer. I/O pin
in ECP/EPP mode.
2PD0
INDEX*
Parallel Port Data 0 – This pin (0 to 7) provides parallel port data signals.
Index – Sense detects the head is positioned over the beginning of a track
3PD1
TRK0*
Parallel Port Data 1 – This pin (0 to 7) provides parallel port data signals.
Track 0 – Sensing detects the head is positioned over track 0.
4PD2
WPRT*
Parallel Port Data 2 – This pin (0 to 7) provides parallel port data signals.
Write Protect – Senses the diskette is write protected.
5PD3
RDATA*
Parallel Port Data 3 – This pin (0 to 7) provides parallel port data signals.
Read Data – Raw serial bit stream from the drive for read operations.
6
PD4
DSKCHG*
Parallel Port Data 4 – This pin (0 to 7) provides parallel port data signals.
Disk Change – Senses the drive door is open or the diskette has been changed
since the last drive selection.
7 PD5 Parallel Port Data 5 – This pin (0 to 7) provides parallel port data signals.
8 PD6 Parallel Port Data 6 – This pin (0 to 7) provides parallel port data signals.
9 PD7 Parallel Port Data 7 – This pin (0 to 7) provides parallel port data signals.
10 ACK*
DS1*
Acknowledge * – This is a status output signal from the printer. A Low State
indicates it has received the data and is ready to accept new data.
Drive Select 1 – Select drive 1.
11 BUSY
MTR1*
Busy – This is a status output signal from the printer. A High State indicates
the printer is not ready to accept data.
Motor Control 1 – Select motor on drive 1.
12 PE
WDATA*
Paper End – This is a status output signal from the printer. A High State
indicates it is out of paper.
Write Data – Encoded data to the drive for write operations.
13 SLCTIN
STEP*
Select In – This output signal to the printer is used to select the printer. I/O pin
in ECP/EPP mode.
Step – Low pulse for each track-to-track movement of the head.