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Power Macintosh 7600 with G3 Upgrade
Posted by: KeepGood on 2026-07-03 08:26:58
Hi All,

I've recently bought a Power Macintosh 7600. It came with a littleJoe/Joecard 233Mhz Cpu card. I found an old thread about it here...

https://68kmla.org/bb/threads/joecard-manual-software.40957/

The complete software CD is there but I'm having the same issue is the last person who posted there. FYI I'm a complete Mac noob, I've never used one of these old Mac's before. It came with the German version of MacOS 8.6 installed. I've installed a BlueSCSI and got the English version of MacOS 8.6 installed so it's a nice clean system now. I did manage to find the CPU extension and control panel software (apologies if that's the wrong terminology, still learning my Mac lingo) in the old German install and have transferred to the clean install drive. It does seem to be working, I'm seeing the 'littleJoe' banner while the system is booting up. It seems to be nice and snappy. The version of the software I have is older than the version posted in the thread above so I'd like to install the newer one.

The system doesn't seem to know what the installer is when I try running it. Could someone who is familiar with Mac's take a look at the installer from the above thread and let me know what I do with that kind of file? Again, apologies for what might seem like a completely stupid question. I have zero clue how these systems work.

Thanks in advance 🙂
Posted by: Byrd on 2026-07-05 02:14:02
Welcome @KeepGood 😀

It sounds like the resource fork has been stripped from the driver CD posted to that thread. It's not easy to redo the resource file; you can use the XLR8 software interchangeably with this card:

XLR8 MACHSpeed Control - Macintosh Garden

Downloads: MAChSpeed_Control_Combo.dmg XLR8 MAChSpeed Control software. This includes the hard-to-find XLR8 MACh Speed Control 1.4.3 that will run many G3 upgrades on OS 8 PowerBooks. XLR8 Universal CD 1.4.3Original XLR8 Universal Driver Install CD-ROM Image containing versions 1.4.3 of all of...
macintoshgarden.org macintoshgarden.org
Posted by: Phipli on 2026-07-05 02:20:32
@KeepGood

Could you put a copy of the versions of the extension and control panel you currently have in a folder and then compress them with DropStuff or MacZip?

Please please please.
Posted by: Coloruser on 2026-07-05 02:37:58
As one of the original developers of the JoeCard, I will post the driver here…..
Posted by: Phipli on 2026-07-05 04:06:09
As one of the original developers of the JoeCard, I will post the driver here…..
That would be great if you could.

Were you on the hardware or software side?
Posted by: Coloruser on 2026-07-05 09:12:17
That would be great if you could.

Were you on the hardware or software side?
Both - but the heavy lifting job was done by Thomas Rudloff. Zipped from the original CD on a PowerBook G4.
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