On the Mac Plus, I find something odd.
The Plus was introduced in '86 but got the silver/grey case in '87 but the Plus was in production for 5 years. So according to this, there should be more sliver/grey Pluses out there. But from what I seen, there are more Yellow/Beige Pluses.
http://www.hardwaresecrets.com/article/Inside-the-Macintosh-Plus/1698/1
http://www.jagshouse.com/macplus.html
Like the older SE, you needed to cut a resistor ( R8 ) to access more than 256K RAM on the Plus
http://www.hardwaresecrets.com/article/Inside-the-Macintosh-Plus/1698/4
The Plus was introduced in '86 but got the silver/grey case in '87 but the Plus was in production for 5 years. So according to this, there should be more sliver/grey Pluses out there. But from what I seen, there are more Yellow/Beige Pluses.
http://www.hardwaresecrets.com/article/Inside-the-Macintosh-Plus/1698/1
http://www.jagshouse.com/macplus.html
Like the older SE, you needed to cut a resistor ( R8 ) to access more than 256K RAM on the Plus
http://www.hardwaresecrets.com/article/Inside-the-Macintosh-Plus/1698/4