C H A P T E R 3
Devices and Ports
Serial Port Compatibility
The first release of the MacOS USB DDK does not include a universal Serial/ USB shim that would allow processes that use the Communications Toolbox CRM to use a USB serial device. At the introduction of the iMac computer, any USB Serial Class Driver will need to implement its own Serial/USB shim.
The first release of the Mac OS USB DDK does not include a universal Serial/ USB shim that would allow processes that use the Communications Toolbox CRM to find and use a USB modem device. At the introduction of the iMac computer, any USB modem device would need to implement its own communication shim to interface between the CRM and its USB Communication class driver. For more information, please refer to the Mac OS USB DDK, which is available from the Apple Developer DDK page on the World Wide Web, at
http://developer.apple.com/sdk/
Macintosh-To-Macintosh Connections
USB is a serial communications channel, but it does not replace LocalTalk functionality on Macintosh computers; you cannot connect two Macintosh computers together using the USB. The best method for networking iMac computers is through the
USB Storage Devices
The Macintosh USB software does not support booting from an external USB storage device.
USB Controller
The iMac computer uses an Open Host Controller Interface (OHCI) controller for USB communication. Some early USB devices (most notably keyboards) can’t interoperate with an OHCI controller. Those devices will not be supported by the Macintosh USB system software.
USB Ports | 31 |
