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DIR10
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LAPLINKV.ZIP
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LAPLINKV.TXT
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1993-08-30
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59 lines
Traveling Software's LapLink-V and LapLink-Pro implement a "proprietary"
eight bit parallel data transfer scheme. In most cases, Traveling
Software furnishes both a parallel and serial cable with their software.
However, they also market one version of LapLink-V intended to be
included in a hardware bundle which comes only with the serial cable.
This version is full featured, and has all protocols for their serial,
four bit (LapLink-III compatible) and eight bit data transfer.
Unfortunately, Traveling Software publishes only their serial and
four-bit parallel interfaces. The eight bit data transfer scheme
appears to be an extension of the four bit method (That is, an eight bit
parallel transfer cable can be used for four bit parallel transfer).
Taking a trusted ohmmeter to an existing cable reveals the following
pinouts:
DB-25P DB-25P Printer Cable
Socket 1 Socket 2 Usage Color
Socket 1 Socket 1
1 1* Strobe Brown
2 15 D0 Red
3 13 D1 Orange
4 12 D2 Pink
5 10 D3 Yellow
6 11 D4 Green
7
8
9
10 5 Acknowledge Grey
11 6 Busy White
12 4 Paper Out Black
13 3 Select Brown/White
14 14* Auto Feed Red/Black
15 2 Error Orange/Black
16 16* Initialize Printer Lt.Blue/Black
17 17* Select Input Lt.Blue
18
19
20
21
22
23
24
25 25 Common White/Black
The asterisks indicate the lines that are added from LapLink-III, which
supported only the four bit protocol. Note also that the cable is
bidirectional; either end can be plugged into either the source or
destination machine. The four bit version of this cable also matches
Novell's specification for a parallel data link for their FileLink
data interchange utility.
One good way to start building a LapLink-V cable is to purchase a
standard parallel printer cable from your favorite computer store. Then
simply cut off the Centronics connector and use an ohmmeter or
continuity tester to determine which wire connects to each pin on the
connector. The chart above indicates the colors for the cable which I
used, which was purchased from MicroCenter.