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[www].se [ftp].se [mirror].us
PowerFPU.hqx (145.87 KB)
For System 7.0 - 7.6 - Mac OS 9
[www].se [ftp].se [mirror].us
powerfpu13install.sit (272.02 KB)
For System 7.0 - 7.6 - Mac OS 9
This app works with: SheepShaver,

PowerFPU is a software 68K FPU emulator for PPC Macs. It's a Control Panel, similar to SoftwareFPU, but much faster and more efficient. This software may be necessary to run (certain) older 68K apps on PPC hardware.

PowerFPU is a high-performance 68K FPU emulator for the Power Macintosh from John Neil & Associates.

By working closely with the built-in Apple 68K emulator and redirecting 68K FPU calls to the high-speed PowerPC CPU, PowerFPU provides extremely fast 68K FPU emulation. PowerFPU is over ten times faster than SoftwareFPU, John Neil & Associates' other freeware FPU emulator, and faster than some versions of the Motorola FPU chip itself! The chart below shows where PowerFPU performance falls in the range of Macintosh FPU performance:

Time to execute John Neil & Associates FPU Time Test FPU benchmark:

PowerFPU 1.0 (emulation) 1.60 (Power Mac 8100/80)
16MHz 68882 FPU (chip) 1.65 (SE/30)
16MHz 68881 FPU (chip) 2.53 (Mac II)
SoftwareFPU 3.02 (emulation) 20.6 (Power Mac 8100/80)

With PowerFPU you can run all 68K FPU applications at full-speed on your Power Macintosh!

Excerpt: — John Neil & Associates   

View the author Tom Pittman's page:

See Also: SoftwareFPU

Architecture: PPC

Requires a PPC Mac.
"One unlucky user discovered that opening the PowerFPU control panel disables it, requiring a re-install. Just install it and don't open it, if you have that problem."


3371-Alpha's picture
by 3371-Alpha - 2016, September 13 - 6:55pm

You know I wonder if this is compatible with Speed Doubler's 68k emulator? I don't actually own a computer old enough to use this, but I am still curious.

MacinTricks's picture
by MacinTricks - 2011, May 10 - 6:57am

The additional download is the installer for PowerFPU 1.1 and the updater to version 1.3 (not 1.3b1). However, it is unclear which version 1.3 or 1.3b1 is more recent (a lot of programmers don't rigorously follow software release version conventions). Incidentally, the original BinHex (hqx) file does not have a valid time stamp from its creation. Doing a legit install seems to eliminate the pesky "Install from master disk" message.

As for the "disabling red X" issue, try shutting down and cold-starting the computer. The control panel will disable after a restart, so the computer must be shut down every time to use PowerFPU.

IIGS_User's picture
by IIGS_User - 2009, May 6 - 5:26pm

Thank you for uploading this part of software to match my request at the SoftwareFPU entry.