half a dozen motherboards

#1 Fri, 7 Oct 2011 - 00:01 68kMLA

1. Make impulse purchase of six compact Mac motherboards

2. ???

3. Profit!

Actually I fixed a SCSI problem with my Mac Plus by swapping in ROMs from one of these motherboards, so I guess that counts as profit.

#2 Fri, 7 Oct 2011 - 02:27 68kMLA

Are these all of a certain type, or mixed?

#3 Fri, 7 Oct 2011 - 02:49 68kMLA

It looks like 4 Mac Plus boards, a 128/512 board and an SE(?) board.

#4 Fri, 7 Oct 2011 - 03:14 68kMLA

Yup, jruschme got it exactly right.

#5 Sat, 8 Oct 2011 - 00:11 68kMLA

I'm guessing the SE is an FDHD board since it has a battery holder. It seems all of the pre-FDHD SEs had soldered batteries. Of course, I have heard of guys who've installed battery holders on 800K SE boards.

#6 Sat, 8 Oct 2011 - 01:02 68kMLA

Hmm, could be. How can I tell? The silkscreen on the motherboard says "IWM", not "SWIM", but I don't know if that's meaningful.

#7 Sat, 8 Oct 2011 - 02:58 68kMLA

That'd be an original SE mobo then - IWM (Integrated Woz Machine) is the 800k controller. SWIM (Super-Woz Integrated Machine) is the one used on the SE FDHD and indeed all HD floppy compatible Macs.

#8 Sat, 8 Oct 2011 - 03:42 68kMLA

i have the SWIM/ROM ICs for the SE.

#9 Sat, 8 Oct 2011 - 05:44 68kMLA

But does the motherboard silkscreen actually say "SWIM" on the FDHD SE? If it was just a ROM change, it's likely they kept the old motherboard.

#10 Sun, 6 Nov 2011 - 22:17 68kMLA

It turns out this actually is a SE FDHD motherboard, and the "IWM" on the silkscreen means nothing. I booted it up and checked the ROM revision number to be sure. Then connected a 1.4MB floppy drive, and it worked just fine. Woohoo!

#11 Wed, 9 Nov 2011 - 17:54 68kMLA

Nice haul. I don't even know of any place around here where such great older stuff could be found.