Apple Serial NB Card
The Apple Serial NB Card is an expansion card that allows personal computers in the Macintosh II family of systems to connect to remote systems via a variety of industry-standard serial communications protocols. The card includes four serial ports that support RS-232, RS-422, X.21, or V.35 communications. An intelligent NuBus card, the Apple Serial NB has its own 68000 microprocessor, memory, and multitasking operating system. Operating independently of the main Macintosh II processor, the Serial NB Card supports the execution of communications protocols with minimal access to the Macintosh II processor and operating system. And because all of the communications processing is done on the card, Macintosh applications can run more effectively under MultiFinder. When used with Apple's MacAPPC software, the Serial NB Card provides a complete SDLC solution, at the physical and data-link layers, for connectivity in the IBM Systems Network Architecture (SNA) environment.
- Motorola 68000 running at 10 megahertz
- 512K of RAM, expandable to 1 megabyte
- Transmit/Receive data rates:
- 19.2 kilobits per second
- 64 kilobits per second using the specified DMA-backed ports