Well, maybe you would be able to do that, because the Disk ][ port has both a
data input and a data output. But I think there are easier ways to do that. The
most obvious is a serial card or (even better) and Ethernet card. You could
also use a parallel card (a Centronics port has 8 output lines and 5 input
lines, so you would be able to transfer a nibble every cycle) or the game
port's digital inputs and outputs.

I think the problem is the software more than the hardware. If I have undertood
well, you're talking about taking a task, dividing it automatically into
subtasks, and delivering them to different processors. You'll need to build a
paralel compiler to do that, and it's no trivial task. And even if you build
the compiler, you'd also need a software layer to communicate data and results
set to other computers and synchronize them, and probably a multitasking kernel
too, to achieve all those tasks. That is a project big enough for a Doctorate
Thesis in Computer Science. But it may be fun to develop it using 20 year old
machines ;-) .

About the limit of tiers: I'd desing it using only a "master" computer
(coordinating the whole system and interfacing with the user), and a single
tier of "slave" computers (making the calculations). But, given each computer
has all the needed hardware to communicate with three computers, the number of
tiers wouldn't be limited by the hardware alone. But take into account that the
more the tiers, the slower the data will move through the entire system. You
may arrive at a point where adding more computers don't increase the power of
the system because of the time lost propagating data.

Greetings,

Antonio Rodr�guez (Grijan)
<ftp://grijan.cjb.net:21000/>

Jennifer Worgan ha escrito:

> I guess I'm asking if the data transmission that leaves an Apple IIE
> diskdrive card output when commanded to transmit data to diskdrive be
> received and "read" by the input of the diskdrive card of another Apple IIE
> commanded to receive a data transmission from a disk drive?



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