WonderMCA Archives

WonderMCA goes wireless: Bluetooth keyboards, mice and game pads for your PS/2

Your PS/2 can now go wireless. With the Bluetooth firmware, the WonderMCA pairs Bluetooth keyboards, mice and game pads, both Classic Bluetooth and Bluetooth Low Energy, and hands them to the PS/2 as the hardware it has always known: its own keyboard, a serial mouse and a joystick on the game port. No dongle, and nothing to install on the PS/2.

The WonderMCA BIOS Bluetooth page during a keyboard pairing: "Type this code on the keyboard, then press Enter: 004271", 52 seconds left — A keyboard pairs: type the code on the Bluetooth keyboard itself.

The WonderMCA BIOS Bluetooth page after a pairing: "Status : Ready - 1 connected", a DualShock 4 Wireless in Paired devices, connected — A game pad paired and connected.

What the PS/2 sees

The card does all the Bluetooth work. The PS/2 never talks Bluetooth: each device arrives through a path that DOS and its programs already know.

Keyboard: it is the PS/2’s own keyboard. The card sends the keys to the keyboard controller of the PS/2, so national layouts with KEYB, Ctrl-Alt-Del and the repeat of a held key work as usual. A Bluetooth keyboard and a USB

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IBM PS/2, WonderMCA

WonderMCA – The SmartDrive ghost, 4 MB of extra RAM, a CPLD that reprograms itself, and a Server 95 running DOOM

vincent / September 22, 2026 / IBM PS/2, WonderMCA

Where we were

Since the summer WonderMCA has worked on every PS/2 I own… as long as you did not look too closely at the 386DX machines. On the 286 and 386SX boxes (8550Z, 8555, 8556, 8557) the card was solid. On the Model 70 (8570), the same card, the same firmware and the same CPLD produced a slow drip of problems that never pointed at anything:

at power-on the BIOS sometimes said “Memory change: Reset the RAM Config”, meaning the card’s configuration block had been changed behind its back;
DIR C: could reboot the machine;
loading a 67 KB .EXE from the emulated floppy rebooted the PC before the program even started.

This post is the story of the last few weeks. It covers five things that turned out to be linked more than I expected:

finding the real cause of the 8570 instability (spoiler: SmartDrive, and four

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