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qpchw.doc
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1991-02-06
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DATAPATH Q-PC Hardware Characteristics Driver
SUMMARY
=======
QPCHW is the Datapath Q-PC hardware characteristics driver. Its purpose
is to provide a standard way for applications to find information relating
to the hardware configuration of the Q-PC cards in the system.
The Datapath Q-PC Initialization program QINIT, and the Datapath Configuation
File Editor QCONFIG, inform the hardware characteristics driver of the values
set in Q-PC configuration files. The Datapath Q-PC Hardware Characteristics
Driver Controller QPCHWCTL can be used to display and change the information.
QPCHWCTL is useful for trouble shooting.
The following hardware characteristics are defined (their default values
are given in brackets):
Q-PC board base address (0300H)
Q-PC board interrupt request number (IRQ) (10)
Q-PC board DMA channel (7)
Q-PC board memory size X (2048)
Q-PC board memory size Y (1024)
Q-PC board memory fold (1024)
Q-PC board memory planes (0x0f)
Currently, applications do not use the interrupt number or the DMA channel.
USAGE
=====
If you change any of the hardware characteristics from their default values,
you MUST install QPCHW. This is done by running QPCHW from the autoexec.bat
file when the PC boots up.
eg add the line
qpchw
to your autoexec.bat file. Note that QPCHW should be run before QINIT.
The memory sizes are very often different from the default. (The default size
is small enough to fit on most boards.) QINIT will work out the memory sizes
when it initializes the Q-PC board and QPCHW.
Another characteristic that is often changed is the base address of the Q-PC
board. To change the base address you would:
1. Change the links on the board to select the required address (see the
Q-PC Manual for information on installing the hardware).
2. Install the Q-PC initialization software and configuration files
(read the file QSETUP.DOC on this disk).
3. Edit your autoexec.bat file to install QPCHW, as described above.
Reboot your computer to load QPCHW.
4. Use QCONFIG to create a new Q-PC configuration file specifying the
new board base address (read the file QINIT.DOC on this disk).
5. Initialize the Q-PC board (and QPCHW) using QINIT and the new file.
It is not necessary to install QPCHW if you use the default values for the
hardware characteristics. In view of the fact that the memory sizes are very
often different from the default, it is recommended that QPCHW be installed.
SUPPORT
=======
Please report any problems to
Mark Ferguson
DATAPATH Ltd
Alfreton Road
Derby
DE2 4AD
V2.00 11 July 1990
V2.01 11 Jan 1991