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Connectix Speed Doubler 8

Your rating: None Average: 4.3 (3 votes)
Year released:
[www].se [ftp].se [mirror].us
speed_doubler_8.sit (1.75 MB)
For System 7.0 - 7.6 - Mac OS 8 - 8.1
[www].se [ftp].se [mirror].us
Speed_Doubler_8-DE.img_.sit (1.12 MB)
For System 7.0 - 7.6 - Mac OS 8 - 8.1
[www].se [ftp].se [mirror].us
SD8-DE.sit_.hqx (1.70 MB)
For System 7.0 - 7.6 - Mac OS 8 - 8.1
This app works with: SheepShaver, Basilisk II,

Speed Doubler includes three extensions: Speed Emulator (PowerPC only), Speed Access, and Speed Copy. This software combines an enhanced disk cache, better Finder copy utility, and a dynamically recompiling 68K-to-PowerPC emulator, which was faster than both the interpretive emulator that shipped in the original PowerPCs and the dynamically recompiling emulator that Apple shipped in later machines. It was made obsolete as 68K applications became less common and OS code improved in 8.5 & later.

First DL:
The download contains a disk image with the installer for Speed Doubler 8.0.1, Speed Copy 8 Server and RAM Doubler 2.0.2 updater. Also included in a separate folder is the updater for Speed Doubler 8.1.2 and version 8.1.2 of Speed Copy.

Second DL: German floppy image. IMG, StuffIt 5.
Third DL: Same as 2nd DL, DiskDup+, StuffIt 4 for better backward compatibility.
(DiskCopy 4.2 could not manage to read the floppy.)

See Also: Connectix CopyAgent

Architecture: 68k PPC

68030, 68040, PPC
Mac OS 7.5.5 to Mac OS 8.5


3371-Alpha's picture
by 3371-Alpha - 2016, September 8 - 6:10am

It's worth noting that this extension is compatible with BasiliskII. It certainly speeds up the emulated OS, though can also cause crashing when running certain types of processes.

vt4000's picture
by vt4000 - 2015, August 5 - 2:54am

I got past the "master disk" message by using Disk Copy to write the image to a floppy disk and then sliding the read-only tab. It installed from there just fine. Great application.

marcus's picture
by marcus - 2013, July 2 - 4:13pm

The installer on this disk image says it requires the master disk--does anybody have a way to make this work?