Re: AACP - Apple-to-Apple Copy

["Michael J. Mahon" <mjmahon@aol.com>]

D. Finnigan wrote:
> On 2009-08-31 14:28:57 -0500, "Michael J. Mahon" <mjmahon@aol.com> said:
>
> > If the receiving machine is essentially EXECing it, then carriage
> > returns will require enough following NULs to allow the Applesoft
> > interpreter time to tokenize and store each line.

> That's what caused the slow-down when I tried it. I was using PR#2 on 
> the IIgs and IN#2 on the //e. Nearly took me an hour of fiddloing to get 
> the whole program intact, and afterward, I thought about making an 
> automated program to transfer between Apples.

One approach that would be "low impact" would be to write a tiny
intercept routine for COUT that performed a programmed time delay
after each CR.  That way, all the other characters could go at top
speed (as long as only the CR caused the receiving machine to scroll).

> The only thing keeping me from trying Nadanet is having to build the 
> part. The most I have ever done with the game socket is poke two wires 
> in the annunciators, one to a green LED, the other to a red LED and move 
> a joystick up to turn on the red, and move it down to turn on the green 
> LED, and have the state displayed on-screen all with Applesoft. I was 
> impressed, anyway.

A couple of current-limiting resistors would be good, too.  ;-)

You may be amused to hear that prior to the //e, Apple II annunciators
could directly drive Apple II pushbutton inputs, so the first version
of NadaNet was *exactly* a length of twisted pair with the ends inserted
into a pushbutton and annunciator (the other wire was ground).  In fact,
that's why I called it *Nada* Net, since nothing but wire was needed for
a small network.

The little buffers on the adapter preserve the logical characteristics
of a piece of wire while beefing up the drive capability so that dozens
of machines can be on a net, even the harder-to-drive Apples.

> Looks like a trip to the Radio Shack for me, then!

Or you can order a pair through Bill Garber:

www.garberstreet.com/Nadanet.html

The pre-built adapters are on a small PC board, and don't require
soldering.  The homebuilt adapters are even smaller, but take some
soldering and dexterity.  ;-)

-michael

NadaNet 3.0 for Apple II parallel computing!
Home page:  http://home.comcast.net/~mjmahon/

"The wastebasket is our most important design
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