Re: Chaining internal floppy drives - is it possible?

[Ian Primus]

I thought about that, but the Macintosh knows the difference between  
internal and external floppy drives, which leads me to believe that  
they would be on separate busses, or at least have different  
connections to the IWM chip. I tried testing between the floppy  
connectors on a Macintosh SE logic board, but couldn't really conclude  
much of anythings, I am pretty sure that I am getting false readings  
because of the rest of the circuitry on the board. I know that if you  
have two internal floppy drives on a Macintosh SE, as well as an  
external drive, they alll work, and the computer knows the difference  
between the upper, lower and external drives. Another thing to think  
about, is wether the Macintosh System Software will know what to do  
with the extra internal floppy. Would it see it? Would it get confused  
trying to draw the requester boxes? It shows a little picture of the  
computer pointing to the proper drive on a Mac SE, but what would it do  
on a Plus or an SE/30 with a second internal floppy, something that  
shouldn't be possible? Evidently it works, since I found another Mac on  
Applefritter with a second floppy drive rigged up internally. (  
http://www.applefritter.com/macclones/systematics/index.html ),  
although in this case, they may have connected it to the external port  
from the inside, since the connector appears to have been removed from  
the back of the computer. There aren't any pictures of the inside of  
that beast, however, so I don't know.

Ian Primus
[EMAIL PROTECTED]
On Monday, July 28, 2003, at 04:18 PM, Jeff Walther wrote:

At 15:00 -0400 07/28/2003, Compact Macs wrote:

Date: Mon, 28 Jul 2003 15:54:53 -0400
From: Ian Primus <[EMAIL PROTECTED]>
Is it possible to chain two internal floppy drives off of a Mac
motherboard that only has one floppy connector?
One way to figure it out would be to take a continuity (ohmmeter)  
tester to the internal and external floppy connectors.  You should  
find common connections on most of them and the switched wires.

Oh, I guess you'd first need to see how an external floppy drive is  
wired, so that you can translate from the pinout of the floppy  
mechanism to the external connector.

Jeff Walther

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