Please I have MS-DOS 6.22 that runs on a Pentium 4 3. Drivers Onion Vinegar. 0 GHz machine with 512MB of ram. I use this machine to run a legacy application.
The legacy application uses serial port to communicate with an external hardware. The problem is that the connection is not stable sometimes it fails and so the program fails to communicate and terminate. X86 yes the serial bios can be set manually DAVEINCAPS the com1 and com2 were set exactly the way you described the Plug and Play Operating System (PnPOS) was set to yes.
I will set it to No and try to communicate again and get back to you with the results. Another question what does PnPOS does?
7.1 TESTCOM Diagnostic Program. To test your serial port under MS/DOS. The configuration file name is TESTCOM.CFG. For MS-DOS substitution (if. (see the part about interface logic in the Typical RS232-Hardware Configuration module for. If you are using a serial data port.
While I am searching for a solution for this problem I found that newer processors requests a privileged instruction to access the ports and so if this privileged instruction is not issued the processor sends an exception and does not execute the I/O instructon. Since the application run in user-mode, so there something called I/O permission bitmap and it a bit and so based on the value in this bit either the user-mode I/O instruction is executed or not. Therefore some applications might generate an exception if the I/O permission bitmap is not set and so assume that connection has problem and hence application fails to communicate. I am wondering is this problem also applicable to MS-DOS 6.22 and to my case?
Contents • • • • • • • • • • • • Features [ ] DOSBox is a program, configured either by a set of command-line arguments or by editing a configuration file. For ease of use, several graphical have been developed by the user community. A popular feature of DOSBox is its ability to capture and record gameplay footage.
The video is using the Zip Motion Block Video codec. In its uncompressed state the footage is almost an exact replica of the actual program. The video recording feature was added in version 0.65. In earlier versions, one had to rely on custom modifications and a third-party screen recorder to record video, but the quality and emulator performance was generally very poor.
The DOSBox project has a policy of not adding features that aren't used by DOS games if they take significant effort to implement, are likely to be a source of bugs or portability problems, and/or impact performance. Perhaps the most common hardware feature of DOS-era PCs that the official version of DOSBox doesn't emulate is the that was used to connect printers. As an alternative, the function of modern OSs can be used to capture the output of DOSBox. For similar reasons, no support for and is added into official versions, though support for them is available in some unofficial enhanced SVN builds. Hardware emulation [ ] DOSBox is a full emulator, capable of running DOS programs that require the CPU to be in.
Other similar programs, such as or for Windows and OS/2, provide and rely on virtualization capabilities of the family processors. Since DOSBox can emulate its CPU by interpretation, the environment it emulates is completely independent of the host CPU. On systems which provide the, however, DOSBox can use to accelerate execution several times faster than interpretive CPU emulation. [ ] The emulated CPU speed of DOSBox is also manually adjustable by the user to accommodate for the speed of the systems DOS programs were originally written for. DOSBox can emulate a wide range of graphics and sound hardware.