By Jan Axelson
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Additional info for Parallel Port Complete: Programming Interfacing & Using the PC'S Parallel Printer Port
If Win32 Then ‘DLL procedure names are case-sensitive in VB4. ‘Use Alias so Inp and Out don’t have to have matching case in VB. Dll” _ Alias “Out16” (ByVal PortAddress As Integer, ByVal Value As _ Integer) #End If Listing 2-2: Declarations for Inp and Out in version 4 programs, 16-bit or 32-bit. But sometimes a port is intended just for use with a single application. For example, an application may communicate with instrumentation, control circuits, or other custom hardware. If other applications have no reason to access the port, direct I/O with Inp and Out should cause no problems, and is much simpler than writing a VxD.
This file (Listing 2-1) contains the declarations you must add to any program that uses the new subroutine and function added by the inpout DLL. Each Declare statement names a subroutine or function, the argument(s) passed to it, and the name of the DLL that contains the subroutine or function. The use of Alias in the Declares enables Visual Basic to use alternate names for the routines. This feature is handy any time that you don’t want to, or can’t, use the routines’ actual names. In this case, the inp and out routines were compiled with PowerBasic’s DLL compiler.
For example, nStrobe and C0 are the same signal. nStrobe tells you that the signal is a low-going pulse whose function is to strobe data into a peripheral, but the name tells you nothing about which register bit controls the signal. C0 tells you that you that the signal is controlled by bit 0 in the Control register, and 20 Parallel Port Complete Accessing Ports Table 2-3: Differences between original Centronics interface and PC interface Pin (Centronics) Original Function New (PC) Function 14 signal ground nAutoLF 15 oscillator out no connection 16 signal ground no connection 17 chassis ground no connection 18 +5V no connection 33 light detect Ground return for nSelectIn 34 line count no connection 35 Ground return for line count no connection 36 Reserved nSelectIn The PC's D-sub connector has just 25 contacts, compared to the Centronics connector's 36.
Parallel Port Complete: Programming Interfacing & Using the PC'S Parallel Printer Port by Jan Axelson