home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Collection of Tools & Utilities
/
Collection of Tools and Utilities.iso
/
olrdrs
/
yarn_068.zip
/
DOS4GW.DOC
< prev
next >
Wrap
Text File
|
1994-01-11
|
22KB
|
589 lines
DOS/4GW Configuration Guide
WATCOM International Corporation
Waterloo, Ontario, Canada
1 Configuring DOS/4GW
This chapter explains how to use the DOS4G environment variable to
suppress the banner that is displayed by DOS/4GW at startup. It also
explains how to use the DOS16M environment variable to select the switch
mode setting, if necessary, and to specify the range of extended memory in
which DOS/4GW will operate. DOS/4GW is based on Rational Systems' DOS/16M
16-bit Protected-Mode support; hence the DOS16M environment variable name
remains unchanged.
1.1 Suppressing the DOS/4GW Banner
The banner that is displayed by DOS/4GW at startup can be suppressed by
issuing the following command:
set DOS4G=quiet
Do not insert a space between DOS4G and the equal sign. A space to the
right of the equal sign is optional.
1.2 Changing the Switch Mode Setting
In almost all cases, DOS/4GW programs can detect the type of machine that
is running and automatically choose an appropriate real- to protected-mode
switch technique. For the few cases in which this default setting does
not work we provide the DOS16M DOS environment variable, which overrides
the default setting.
Change the switch mode settings by issuing the following command:
set DOS16M=value
Do not insert a space between DOS16M and the equal sign. A space to the
right of the equal sign is optional.
The table below lists the machines and the settings you would use with
them. Many settings have mnemonics, listed in the column "Alternate
Name", that you can use instead of the number. Settings that you must set
with the DOS16M variable have the notation req'd in the first column.
Settings you may use are marked option, and settings that will
automatically be set are marked auto.
Changing the Switch Mode Setting 1Chapter 1
-------------------------------------------------------------------------------
+-------+---------------+-------+----------+-----------------------------------+
| | | |Alternate | |
|Status |Machine |Setting|Name |Comment |
+-------+---------------+-------+----------+-----------------------------------+
|auto |386/486 w/ DPMI|0 |None |Set automatically if DPMI is active|
|req'd |NEC 98-series |1 |9801 |Must be set for NEC 98-series |
|auto |PS/2 |2 |None |Set automatically for PS/2 |
|auto |386/486 |3 |386, 80386|Set automatically for 386 or 486 |
|auto |386 |INBOARD|None |386 with Intel Inboard |
|req'd |Fujitsu FMR-70 |5 |None |Must be set for Fujitsu FMR-70 |
|auto |386/486 w/ VCPI|11 |None |Set automatically if VCPI detected |
|req'd |Hitachi B32 |14 |None |Must be set for Hitachi B32 |
|req'd |OKI if800 |15 |None |Must be set for OKI if800 |
|option |IBM PS/55 |16 |None |May be needed for some PS/55s |
+-------+---------------+-------+----------+-----------------------------------+
The following procedure shows you how to test the switch mode setting.
1. If you have one of the machines listed below, set the DOS16M
environment variable to the value shown for that machine and specify a
range of extended memory. For example, if your machine is an NEC
98-series, set DOS16M=1 @2M-4M. See the section, "Fine Control of
Memory Usage" later in this chapter for more information about setting
the memory range.
+--------------------+---------+
| Machine | Setting |
+--------------------+---------+
| NEC 98-series | 1 |
| Fujitsu FMR-60,-70 | 5 |
| Hitachi B32 | 14 |
| OKI if800 | 15 |
+--------------------+---------+
Before running DOS/4GW applications, check the switch mode setting by
following this procedure:
2. Run PMINFO and note the switch setting reported on the last line of
the display. (PMINFO, which reports on the protected-mode resources
available to your programs, is described in more detail in the
chapter, "Utilities".)
If PMINFO runs, the setting is usable on your machine.
3. If you changed the switch setting, add the new setting to your
AUTOEXEC.BAT file.
Note: PMINFO will run successfully on 286 machines. If your DOS/4GW
application does not run, and PMINFO does, check the CPU type reported on
the first line of the display.
2 Changing the Switch Mode Setting Configuring DOS/4GW
-------------------------------------------------------------------------------
You are authorized (and encouraged) to distribute PMINFO to your
customers. You may also include a copy of this section in your
documentation.
1.3 Fine Control of Memory Usage
In addition to setting the switch mode as described above, the DOS16M
environment variable enables you to specify which portion of extended
memory DOS/4GW will use. The variable also allows you to instruct DOS/4GW
to search for extra memory and use it if it is present.
1.3.1 Specifying a Range of Extended Memory
Normally, you don't need to specify a range of memory with the DOS16M
variable. You must use the variable, however, in the following cases:
* You are running on a Fujitsu FMR-series, NEC 98-series, OKI
if800-series or Hitachi B-series machine.
* You have older programs that use extended memory but don't follow one
of the standard disciplines.
* You want to shell out of DOS/4GW to use another program that requires
extended memory.
If none of these conditions applies to you, you can skip this section.
The general syntax is:
set DOS16M= [switch_mode] [@start_address [- end_address]] [:size]
In the syntax shown above, start_address, end_address and size represent
numbers, expressed in decimal or in hexadecimal (hex requires a 0x
prefix). The number may end with a K to indicate an address or size in
kilobytes, or an M to indicate megabytes. If no suffix is given, the
address or size is assumed to be in kilobytes. If both a size and a range
are specified, the more restrictive interpretation is used.
The most flexible strategy is to specify only a size. However, if you are
running with other software that does not follow a convention for
indicating its use of extended memory, and these other programs start
before DOS/4GW, you will need to calculate the range of memory used by the
other programs and specify a range for DOS/4GW programs to use.
DOS/4GW ignores specifications (or parts of specifications) that conflict
with other information about extended memory use. Below are some examples
of memory usage control:
Fine Control of Memory Usage 3Chapter 1
-------------------------------------------------------------------------------
set DOS16M= 1 @2m-4m Mode 1, for NEC 98-series machines, and use
extended memory between 2.0 and 4.0MB.
set DOS16M= :1M Use the last full megabyte of extended memory, or
as much as available limited to 1MB.
set DOS16M= @2m Use any extended memory available above 2MB.
set