I found this via google:

2.1.6 - What monitors will work with my IIci/IIsi?

The IIsi and IIci, which have the same video subsystem, cannot drive a standard 
VGA monitor. However, any monitor supporting a 67Hz refresh rate, 
sync-on-green, and the proper horizontal and vertical refresh rates will work. 
This includes many Sony monitors and the Apple Portrait Display. Apple's 
multisync monitors such as the Multiple Scan 15 do NOT support sync-on-green, 
and will not work properly with the built-in video. The Apple Two-Page Display 
is also incompatible with built-in video on these two Macs.

Some Mac-to-VGA monitor adapters can properly separate the sync signals of 
monitors that do not sync on green, thus enabling otherwise incompatible 
monitors to be used with the IIci or IIsi (at a price, usually around US$50). 
The Apple Developer Hardware Tech Note 
#8<http://developer.apple.com/technotes/hw/hw_08.html> has pinout information 
for the IIci and IIsi DB-15 video ports if you want to make your own adapter.

I was going to say to just wire up a hack (I found the pinout pretty easily via 
your friend and mine, Google ;-)), but the above makes me think you may have 
more work than you would expect if you headed this way.

I assume pulling the hard drive out and copying the data isn’t an option? ;-)

Back on the ‘make a cable’ idea, I wonder what color usually has sync? Could 
you just wire green to that color and live with ridiculous colors but at least 
see something…


I don’t know the mouse and keyboard pinout, but it looks like any ADB mouse and 
keyboard should work, assuming my 2 minutes searching turned up the truth (hey, 
it was on the internet, it must be right, right??? ;-))

Rusty


From: PLUG-discuss [mailto:[email protected]] On Behalf 
Of Richard Wilson
Sent: Tuesday, December 13, 2016 10:36 AM
To: [email protected]
Subject: Does anyone have...

I have received an old Macintosh IIsi that belonged to a cousin who passed away 
unexpectedly.  Her daughter asked me to see if I could retrieve anything off it 
-- and I have only the computer itself -- no Monitor, Keyboard or mouse.  The 
monitor connector is a unique Apple one -- a 15 pin 2 row (8 and 7 pins) female 
connector that is NOT VGA...

Does anyone have a compatible Monitor, Keyboard and mouse I could borrow for a 
few days or know where I could find them?  I've been looking for a converter 
for the monitor plug so far without success...

The sad thing is I HAD such a monitor and got rid of it a few years ago...

Thanks in advance,

Richard Wilson
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