Caple C871i Manual do Utilizador descarregar pdf (Página 80)

Apple II Computer Info

after talking with some teachers it seems some in the elementary

actually wanted it back!

The humorous bit about Apple II hardware is that it is PERFECT for

"drill and practice" for the lowest grades (Preschool to Grade 3).

Little kids don't really care about fancy 3D graphics.. to them even

Number Munchers is cool.

So I hooked it all back up for them. That old digicard server is

currently serving about 35 Apple II's daisychained across about seven

classrooms, and sitting on a UPS to fight off problems of SCSI drive

sticktion during an outage..

Note that this is the "newer" digicard. There is an "older" digicard

with different wiring. There appear to have been three versions of the

digicard server. The PhoneNet one is the 2nd and 3rd generation

server. Here's a picture of the one I'm getting, a 2nd generation

server without an Ethernet jack on the back:

http://www.geocities.com/s_c_a_l_a_r/digicard-src2.jpg

This later version of the Digicard server is easy to manage because it

is essentially an AppleTalk network, except it uses the cheaper

"PhoneNet" connectors with plain old telephone wire strung from one

machine to the next. At the end of a wiring run, you insert a

"termination resistor" -- little more than a phone jack with a

resistor crimped in it -- into the last network port to absorb noise

on the network.

You can use the official Digicard network boxes, or you can use the

Farallon Macintosh PhoneNet boxes, and they all work together, no

problem. There doesn't appear to be much difference at all between a

Farallon PhoneNet Star Controller, and a Digicard 12-channel Star

controller either. Lurking in my bedroom closet is a Farallon network

repeater, should anyone ever want to use a IIe with Digicard some 500

meters away..

And indeed the rewiring of the building with cat-5 100base-T is a boon

for the old Digicard network! Merely yank out the Ethernet jumpers

linking a port to the 100base-T hub, and instead use the jumpers to

loop Digicard signals out from one room's network port and into

another. The wiring itself doesn't care if it carries 100mbit Ethernet

or 1mbit DigiCard signals.

You can wire the digicard network either as a bus, one machine to the

next, to the next, etc, or as a star -- like our "modern" 10/100base-T

hubs -- or a combination of both.

The one school doesn't have any star/hub controllers, so I've wired

all the machines into a bus network. This design requires two Ethernet

wall jacks to work, because all machines are in a big long chain and

the signal has to come into the room on one port and head back out on

another. Newer machines get Ethernet priority, so in some rooms I use

jacks on opposite sides of the room to pass the digicard through to

the next room. Lotta phone wire strung everywhere, but it works! :-)

In case you ever find any, there's a IIe digicard with a DB-9 output,

and there's a IIgs version with NO cable connection at all. With the

IIe digicard, you plug in a ribbon cable with a DB-9 port, and a DB-9

Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 80 of 572

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