Re: Mac Classic II Question

Marc Lindahl (shark@dti.net)
Tue, 13 Aug 1996 12:45:33 -0400


Sounds like the classic II has Geoport serial ports. The newer OS (7.5.1
and up) have new serial port drivers which give you the <230Kbaud async
rates (230, 115, 56, etc). You can also get a system extension for earlier
OS's. The 'clocked externally' is the Geoport format, which is a
synchronous serial stream with clock. For that, you need special hardware,
like apple's Geoport telephone adapter. You might dig around apple's tech
info library for the geoport spec, but for a regular serial stream,
rs232/422, it's async, but you probably can get 230 or 115 Kbaud with
updates software.

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