Intermec 6200 Reference Guide

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In the PEN*KEY 6000 Series system, shown in Figure BĆ4, the RAM disk stores

Windows and the application, along with data from the application.

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Figure BĆ5

In Figure BĆ5, a PC Card is used in place of the RAM disk.  The system considers

the PC Card as a disk drive.  There are several types of RAM and flash PC Cards

that can be used in this configuration.

Windows can run in either standard mode or enhanced mode.  The enhanced

mode, better known, was created by Microsoft to provide virtual DOS boxes,

which make it possible for Windows to run DOS programs within the Windows

environment.  Virtual DOS boxes insulate DOS programs from the hardware, in

essence simulating a DOSĆmanaged PC.  The main drawbacks to enhanced mode

are slower execution speed and larger code size.  Despite its name, the enhanced

mode is the slower of the two modes; and the size of the Windows code required

to support enhanced mode is up to 1 MB larger.
The standard mode, which is the native mode for Windows, does not support

DOS programs.  But the standard mode is significantly faster and smaller than

the enhanced mode.  Normally, the PEN*KEY 6000 Series Computer runs in

standard mode only.  This means that you cannot utilize both a DOS application

and a Windows application in the same environment on the computer.  If WinĆ

dows is running on the PEN*KEY 6000 Series Computer, all applications must

be Windows applications.  If DOS applications are needed, the PEN*KEY 6000

Series Computer should be operated in the DOS environment.  For the applicaĆ

tion developer, this is critical.  Some existing applications may require enhanced

mode to run; this is probably because of the following:

1. Applications were originally designed to run under DOS and were later

ported to Windows.

2. Applications make use of the Windows 32Ćbit memory model.