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PortTalk Windows NT I/O Port Device Driver 2.2
Accessing I/O Ports in protected mode is governed by two events, The I/O privilege level (IOPL) in the EFLAGS register and the I/O permission bit map of a Task State Segment (TSS). Under Windows NT, there are only two I/O privilege levels used, level 0 & level 3. Usermode programs will run in privilege level 3, while device drivers and the kernel will run in privilege level 0, commonly referred to as ring 0. This allows the trusted operating system and drivers running in kernel mode to access the ports, while preventing less trusted usermode processes from touching the I/O ports and causing conflicts. All usermode programs should talk to a device driver which arbitrates access. The I/O permission bitmap can be used to allow programs not privileged enough (I.e. usermode programs) the ability to access the I/O ports. When an I/O instruction is executed, the processor will first check if the task is privileged enough to access the ports. Should this be the case, the I/O instruction will be executed. However if the task is not allowed to do I/O, the processor will then check the I/O permission bitmap.
The I/O permission bitmap, as the name suggests uses a single bit to represent each I/O address. If the bit corresponding to a port is set, then the instruction will generate an exception however if the bit is clear then the I/O operation will proceed. This gives a means to allow certain processes to access certain ports. There is one I/O permission bitmap per task.
6th April 2002 - Version 2.2.
Fixed a debug message typo in the IoExample.
13th January 2002 - Version 2.1, tested on Windows 2000 SP2 and Windows XP RTM.
Added uninstall.exe to deal with older V1.x versions of PortTalk.
12th January 2002 вЂ“ Version 2.0, tested on Windows 2000 SP2 and Windows XP RTM.
Self installs driver for ease of use.
Improved type checking.
Distributed with IoExample code showing use of inportb/outportb() inp/outp() macros and IOCTL calls.
6th September 2001 вЂ“ Version 1.02
Fixed .reg file after previous fix broke Windows 2000 Support. Now supports Windows NT/2000/XP.
26th June 2001 вЂ“ Version 1.01
Fixed .reg file to support both Windows 2000 and Windows NT4.
13th March 1999 вЂ“ Version 1.0 first public release for Windows NT4.
When installing PortTalk V2.x on machines with an older version of V1.x, the existing driver must be un-installed. Simply run the uninstall.exe contained within the PortTalk package with administrator privileges. After the old driver has been removed, running allowio.exe or IoExample.exe will detect the absence of PortTalk and re-install the new driver.
Additionally, the driver can be removed manually. This is only recommended for advanced users. Either
-Replace your old porttalk.sys with the new version and reboot.
-Delete the HKEY_LOCAL_MACHINEsystemcurrentcontrolsetservicesporttalk key and reboot.
-Use the Windows NT Device Driver Installer to stop and remove the PortTalk Driver.
Примечание: Ссылка 'скачать' может вести как непосредственно на файл, так и на сайт производителя, на котором Вы можете найти нужный файл.
Это связано с тем, что некоторые производители не позволяют размещать прямые ссылки на файлы.
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Virtual Serial Port Driver 9.0 Build 9.0.575 LATEST
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Author / Product:
Eltima Software / Virtual Serial Port Driver
All virtual serial ports work and behave exactly like real ones, emulating all their settings. You can create as many virtual port pairs as you want, so there will be no serial ports shortage and no additional hardware crowding your desk. Moreover, Eltima virtual serial port technology can be fully integrated into your own software (OEM license).
Create any number of virtual COM ports
Virtual Serial Port Driver provides you with the ability to create an unlimited number of virtual serial ports. Created ports are located in the 'ports' group in Device Manager, which means that they will be visible and easily recognized by all software and hardware you install. You will be able to set which application has access to the defined port. No real hardware serial ports are occupied.
Sepura Port Devices Driver Download For Windows 7Complete real ports settings emulation
Virtual ports, created by Virtual Serial Port Driver, work exactly like real ones. They emulate all real serial ports settings and provide strict baudrate emulation and full HandFlow control support. Additionally, you can easily emulate
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Manage all signal lines
Virtual serial ports created with Virtual COM Port Driver emulate and support all standard hardware signal lines (DTR/DSR, RTS/CTS, RING, ERROR, DCD, etc.). As in real null-modem connection, DTR of the local port is connected to DSR and DCD of the remote port, and RTS of the local port is connected to the CTS of the remote port. Moreover, you can choose a loopback pinout or create custom one depending on your hardware configuration.
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- The link between virtual serial ports is much faster than real null-modem cable connection and solely depends on your processor speed (average transfer speed is about 5.5 Mbytes/sec)
- Real serial ports are not occupied - you can even have no real ports in the system at all
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Note: 14 days trial version.