Open Transport

What is Open Transport?

Open Transport is Apple's networking software that replaced MacTCP 2.0.6.

Who should use Open Transport?

Owners of PCI Power Macs (7200, 7500, 7600, 8500 and 9500 and higher) MUST use Open Transport. MacTCP is NOT compatible with these machines. Anyone using a Mac with a 68030 processor or only 8MB of RAM should stick with MacTCP 2.0.6. All new Macs come with built in Open Transport.

Open Transport Requirements and Problems
Note: If you are currently running a version of Macintosh OS with MacTCP successfully, it is not necessary to upgrade to Open Transport.

When you install OT 1.1.2 on a 52xx, 53xx, 62xx and 63xx models and get an error indicating a hardware issue was detected it means that Open Transport cannot be installed or loaded until the Cache/ROM DIMM is replaced. Your computer will continue to run classic networking. Please contact an Apple authorised technician to have your computer repaired.

Requirements for Open Transport:

• System 7.5.3 or later is recommended
• At least 12MB of real RAM
• Requires a 68040 microprocessor or better

Open Transport is necessary for the following Macintosh models:

• PowerMac 7200
• PowerMac 7500
• PowerMac 8500
• PowerMac 9500 and higher.

Open Transport 1.1.2 requires a minimum of 5 MB of RAM (68030 or 68040 computers) or 8 MB of RAM (PowerPC-based computers). Open Transport memory requirements are based on total system memory including virtual memory, minus the size of any RAM disk and disk cache you are using.

Turning on virtual memory (especially on PowerPC-based computers). This may affect performance.

Click here to return to the Macintosh index