Publication 1756-RM004B-EN-P - October 2000
6-2 Programming the MVI Module
In addition to the user application, the ROM disk image must also
contain, at a minimum, a CONFIG.SYS file and the backplane device
driver file (MVI56BP.EXE). If a command interpreter is needed, it
should also be included.
CONFIG.SYS File
The following lines must be present in the CONFIG.SYS file:
•
IRQPRIORITY=1
•
INSTALL=A:\mvi56bp.exe
The first line, IRQPRIORITY=1, assigns the highest interrupt priority to
the I/O backplane interrupt. If you want the serial ports to have the
highest interrupt priority, set IRQPRIORITY to 3.
Interrupts are assigned as follows:
•
Backplane Interrupt = Interrupt 1
•
Serial Port 1 = Interrupt 3
• Serial Port 2 = Interrupt 4
• Serial Port 3 = Interrupt 5
The second line loads the backplane device driver. In this example,
the backplane device driver file (MVI56BP.EXE) must be located in the
root directory (A:\) of the ROM disk.
If a command interpreter is needed, you should include a line similar
to the following in CONFIG.SYS:
SHELL=A:\TINYCMD.COM /s /p, where:
/s = “Exit” command cannot be used to stop the command interpreter.
/p = run Autoexec.bat.
TIP
One advantage of a compact flash is that you can
write files to it using the RY utility that ships on the
MVI ROM disk. By contrast, the ROM disk is read
only, and therefore requires utilities that both
create and download a new disk image to make
even the smallest change to it.
A typical scenario is to use a compact flash for
development and simply do a single image build/
download to the ROM disk for runtime units.
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