Understanding Procomm Plus

Procomm Plus is an older software application that was widely used for serial communication, file transfers, and as a terminal emulator. Its usage peaked in the past, especially in environments where serial connections were common.

Option 2: DOSBox-X (For Procomm Plus for DOS)

If you have Procomm Plus for DOS (version 2.x or 3.x), use DOSBox-X (not standard DOSBox).
DOSBox-X includes better serial port emulation and modem support.

Can you run Procomm Plus on Windows 11?

Not natively.

The 16‑bit version (most common) will not run on 64‑bit Windows 11.
Even the 32‑bit version (rare) likely has compatibility issues with modern serial/USB drivers and screen rendering.

Abstract

Objective: This paper investigates the feasibility, methods, and performance limitations of running Procomm Plus (versions 4.8 and 5.0) on Microsoft Windows 11, a 64-bit operating system without native 16-bit subsystem support. Methods: Three deployment strategies were tested: (1) Native execution (Windows 11 64-bit), (2) NTVDMx64 / OTVDM (16-bit compatibility layers), and (3) Virtualization (DOSBox-X, VirtualBox with MS-DOS/Windows 98). Results: Native execution failed entirely due to lack of 16-bit support. OTVDM enabled terminal functionality and Zmodem transfers but exhibited instability with high baud rates (>38,400). Virtualization offered full functionality, including serial passthrough for external modems and serial-over-USB devices. Conclusion: Direct use of Procomm Plus on Windows 11 is not viable without a compatibility layer. For hobbyists and retro-computing telecommunications, DOSBox-X with serial redirection is the most reliable solution.

Quick Answer

Procomm Plus for Windows (versions 4.8, 5.x) does not run natively on Windows 11. It is a 16-bit or early 32-bit application that relied on components Windows 11 no longer includes. You cannot simply install the original CD or floppy disks.

3. Methodology

| Method | Tool(s) | Configuration | |--------|---------|----------------| | Native | Windows 11 Pro (22H2+), Procomm 4.8 | Direct execution of PPLUS.EXE | | Compatibility layer | OTVDM (WineVDM) | 16-bit emulation via thunking | | Virtual Machine | DOSBox-X 0.83+ | Serial port mapping to host COM port | | VM (heavy) | VirtualBox 7.0 + MS-DOS 6.22 | Bridged to USB serial adapter |

Hardware: USB-to-RS232 adapter (FTDI chip), null modem cable, loopback test (COM port echo), and a simulated BBS (Mystic BBS on Raspberry Pi).

Option 1: Windows 11 Pro with Hyper-V (Best for reliability)

Enable Hyper-V (Windows 11 Pro/Enterprise only).
Create a Windows XP (32-bit) virtual machine.
Install Procomm Plus 5.x inside the VM.
Pass through a USB-to-Serial adapter to the VM.

Method 2: DOSBox – The Enthusiast’s Favorite (Best for BBS & DOS)

For those running Procomm Plus 2.0 or the classic DOS versions, DOSBox (or its more modern fork, DOSBox-X) is superb.

DOSBox emulates the entire PC hardware environment (CPU, sound, serial ports). Unlike Windows 11, DOSBox loves legacy software.

Configuration Tips for Procomm Plus:

In the dosbox.conf file, locate the [serial] section.
Add: serial1=directserial realport:COM3 (Replace COM3 with your USB adapter’s assigned port).
Set core=dynamic and cycles=max for smooth performance.

Verdict: Excellent for BBS calling and vintage terminal work. It struggles, however, with high-speed (115k+) serial connections and proprietary file transfer protocols beyond standard ZMODEM.

The 16-Bit Subsystem Graveyard

The most beloved versions of Procomm Plus—specifically Procomm Plus 2.0 (DOS-based) and Procomm Plus for Windows 1.0—were built on 16-bit architecture. Windows 11, like Windows 10 before it, is exclusively 64-bit. Microsoft removed the NTVDM (NT Virtual DOS Machine) entirely. This means Windows 11 cannot run 16-bit applications natively. Trying to launch a 16-bit Procomm Plus executable will immediately result in an error message: "This app can’t run on your PC."

Procomm Plus Windows 11 =link= -