PCI-P104-ADAP PCI to PC/104-Plus or PCI-104 Adapter


  • Permits a PC/104-Plus board to be installed in a PCI slot
  • Universal PCI, PCI-X, 3.3V and 5V compatible
  • Allows for convenient debugging, testing, and software development
  • Switches allow user to simulate the position of the board in the stack
  • Unique layout allows for easy access to both sides of the PC/104-Plus board and provides more room for cabling
  • Connections made via 4×30 (120-pin) 2mm pitch PCI-104 connector
  • Standard PCI card size
Last updated on November 2, 2023, 6:30 pm


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Model PCI-P104-ADAP simply allows for the installation of a PC/104-Plus or PCI-104 board into any Universal PCI, 3.3V or 5V slot. It is a standard PCI bus card that supports 32-bit wide data transfers to and from a PC/104-Plus board. This allows any user the convenience of hardware testing, software development, and debugging of a PC/104-Plus board in a PC environment.

The unique layout of the adapter card allows easy access to both the front and the back of the PC/104-Plus board. This feature enables the user to probe the front and back of the PC/104 board easily and also provides more room for cabling.

The PCI-P104-ADAP provides an environment to simulate a PC/104-Plus stack, and the boards position in a stack. Only four boards are allowed in a PC/104-Plus stack. Most PCI bus signals are common to all four boards in the stack. However, there are four unique signal groups, one for each board position. Each board must get a specific set (out of four sets) of signals: Bus Grant, Bus Request, Clock, ID Select, and Interrupt. Slide switches on the adapter card select which signal group goes to the attached PC/104-Plus board.

The PCI bus clock trace length from the CPU to the modules in the stack is tuned so that the clock edge arrives at the interface when data is valid. Since modules in the PC/104 stack are at different distances from the CPU, a provision is made on the CPU board to supply four clock signals with compensating trace lengths. Four signals from the other groups must also be selected: GNTx, REQx, IDSELx, and INTx. When the PCI bus is being initialized, the operating system will enable each card with a hard-wired select line and read it’s configuration registers. An address is assigned, space in the memory map and I/O map is reserved, etc. Similarly, the CPU’s interrupt signals (INTA, INTB, INTC, INTD) will be distributed among the boards in the stack. Five 4:1 multiplexers and the two slide switches are used to select which signals are routed to the card’s PCI/104 bus connector.


Data Sheets

Drivers and Downloads

Full list of available Downloads: Software Packages, Drivers, Manuals, and other documents

Information about our Free Software packages:

ACCES is proud to provide a full suite of software support with every Data Acquisition product. We are committed to supporting the most popular operating systems and platforms for our customers. Currently we are actively supporting XP -> 10, both 32 & 64 bit, including “Server 2008,” “Embedded,” and “Compact” flavors for all plug-and-play products including PCI, PCI Express, USB, and more. Many products continue to ship with support for additional operating systems such as DOS, Windows 95, 98, Me, NT4, and 2000.


Among the software we deliver with our products are sample programs in a wide variety of programming languages. These samples are used to demonstrate the software interfaces to our products — and many can be used as-is in your production environments, or to test functionality of the devices out-of-the-box. We’re currently actively supporting sample programs in Microsoft Visual C#, Visual Basic, Delphi, and Visual C/C++, with many devices including samples in Borland C/C++ 3.1 for DOS. Additionally we provide National Instruments LabVIEW compatible DLLs and many demonstration VIs for our devices.


Drivers for various operating systems are also provided, including active support for Windows XP -> 10 — all in both 32-bit and 64-bit flavors, and including consumer, server, and embedded varieties — as well as the 2.6 and newer Linux kernels and recent OSX / macOS versions. Many products continue to ship with driver support for Windows 95, 98, Me, NT4, and Windows 2000, but support for these operating systems is considered deprecated.

Setup Programs and Utilites

Our Data Acquisition devices also include a graphical setup utility that walks you through the process of configuring any option jumpers or switches on the device, as well as explaining a little about the various connectors present.

Many devices also include utility programs – little tools to make your use of the device easier, such as EWriter, a program that allows you to read and write data in the user-accessible EEPROM locations on all our USB data acquisitition products; or WinRISC, a “Really Incredibly Simple Communications” terminal program that lets you get started instantly with serial devices.

“Register Level” Documentation

Besides all this software in all these languages and operating systems ACCES has a policy of open and transparent development: none of our lowest-level “register” interfaces are hidden from you — we document every register in every bus card, every command in every serial board, and every usb control transfer in every USB Data Acquisition board. These lowest-level interfaces allow you to develop for our products in ANY operating system or language, regardless of our actively supporting it or having a driver for it. We have customers actively developing in ADA, Android, Python, Java, MATLAB, Solaris, and more, just by referring to our complete low-level interface documentation! And we provide the full source code to all of our drivers, regardless of operating system, to give you an even bigger head start in your own development tasks.

No Fees or Royalties

All of this software is provided at no additional charge, and is licensed under any of a variety of flexible — and royalty free — options. Check out our software license explanation if you’d like more information.

Custom Software

ACCES also offers Custom Software Services for our products. Our prices are unbelievably low, often as inexpensive as free! If you need something tweaked to support your needs, or an entire enterprise application developed from scratch, it is definitely worth your time to inquire with us, first.

Further information about available ACCES Software:

Redistributing Windows Drivers
A list of ACCES drivers and the files that compose them under different versions of Windows, so you can easily redistribute ACCES cards and drivers.

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PCI to PC/104-Plus or PCI-104 Adapter