I would say that barring any pressing hardware issues (weak caps, feeble 
PSU in need of new caps, etc) the next two most important things to do for 
that system is to get an Apple-branded CD drive and a AAUI Ethernet adapter 
for it. 

There are a couple of ways of going about this. One is to build a System 
7.1 Emergency Network Access Disk. As usual with System 7 NADs, space is 
cramped. In this case the way to go is to download and write out the 
official Apple 7.5.0 Network Access disk.

By booting from that disk, you should be able to do a couple of esoteric 
things. First, all Quadras can create a RAM disk through the Memory control 
panel -- as can all PowerBook and the Macintosh Portable. Hopefully you 
have at least 8MiB of RAM. Here's how you do this: 

1.) Create and boot into the 7.5 Network Access Disk. 
2.) Eject the startup disk. This will get painful shortly with disk 
swapping. 
3.) Using Basilisk II, copy the Startup Disk and Memory control panels to a 
floppy disk. (Just copy it out of a System 7.5.3 install that most people 
put on Basilisk II.)
4.) The Memory control panel must be loaded in start up for it to work 
properly, IIRC. You'll need to make space on the 7.5 NAD for the Memory 
control panel to fit -- see if you can get the Startup Disk control panel 
squeezed in too. Better bet is to also copy the utilities you deleted from 
the NAD onto the 2nd floppy so you can make things slightly easier in the 
future. 
5.) Reboot with the 7.5 NAD. Then open the Memory control panel and create 
a RAM disk -- if you have enough RAM, you could even fit the whole 7.5.3 
install. (It's about 40MiB.) Copy the contents of the 7.5 NAD into the RAM 
disk, leaving a little room. If you deleted any contents of the NAD, you'll 
need to restore them. Using the Startup Disk control panel, select the RAM 
disk as the boot volume. Reboot into the RAM volume. If you shut down, 
you'll have to do this all over again. 
6.) Now you should have basically the 7.5NAD in RAM. From here, you might 
even get Ethernet access if you have the AAUI adapter, as it should be 
supported -- if not, you'll have to use LocalTalk, and this means you may 
need to procure an AFP bridge like a Asante box or my favorite, the 
Farallon iPrint LT. Once you get a remote computer mounted, you can install 
it over the network.

I talk extensively about networks at: http://www.applefool.com/se30

In the future, you can build a 7.5.5 NAD CD. Do note that AppleTalk 
networking and other things like MacTerminal won't work on locked disks. 
But nothing says you can't use the NAD CD to create a RAM disk volume and 
copy a trimmed down 7.5.5 or even 7.1 install to access the network. In the 
Guide I demonstrate an example of a 7.6.1 NAD which was an awefully cramped 
arrangement but I networked out via OpenTransport to an OS X Tiger box. 

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