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Great progress.  I need to replace the PS and I have a SeaSonic on its way from NewEgg. This is the IIci board on its side so that it can mate with my IIsi PS that already has a SeaSonic PS: Not shown in the photo is the my external SCSI disk enclosure that IIci board is booting too. The...

I have an original BeOS 5 CD. Would you like an *.iso?

So I recently won an "untested" IIci and it arrived yesterday.  I knew there was a good chance untested meant it would not start up and that happened. The reason I went for this one was that from the photos the board looked in OK shape.  What I could not see from the photos whether the PRAM...

That mouse has a nice feel for righties and I have never seen an optical one.  When I worked for the empire I came away with a clear (roller ball) version of that mouse and the shape that proceeded it. The latter even has an adapter that takes if from serial to PS/2.

The first Mac that I purchased was this iMac 4,1 which recently had its drive die.  Today I got that drive out and soon it will be replaced by an OWC SSD:

Very nice. A IIci is next on my list. I have one of those Daystar 601 accelerators and my chances are better at getting a nice IIci then the unobtanium IIsi daughter card to run it in my IIsi.

Acard AEC 7720U card is what is shown.  Here is what is available on Ebay At some point I'd like to do a bake-off between that card and my SCSI SSDs when time allows... Great progress on conversion and thx again for the how-to on the circuit. I am trying to follow along with your comment...

@superjer2000 exceptional work and exceptional timing. I will follow your lead when time allows. Here is the progress I made today on getting this running in my IIsi.  I had mocked up the fit with a piece of ABS plastic however I was concerned that the board was not grounded to the chassis. ...

I thought about that too. While certainly doable,  I think there'd be a bit of work to get it functioning like the stock PS. I suspect that the power socket for the monitor is not hot until soft power is enabled.  I don't know how to wire that up. As to the fan...that probably could go at the...

Being that there were no instructions in the SeaSonic box, I was careful when approaching the heatsink.  I was pretty sure I'd be OK as the heatsinks all come in contact with the top of the SeaSonic chassis.  As to what is missing... Above is the back of the stock IIsi PS. When I put the...

I spent a bit more time with this.  I didn't have enough standoffs so to mock this up, I used a piece os ABS plastic and riveted it using the stock standoffs: The 3 holes in the plastic are where the PS will be attached to the plastic.  The SeaSonic power connection slots into the stock...

Good to know. One of the SE/30's is getting the on-board 50mhz installed soon so I will look for that setting in the DayStar CP.

Gamba2 documented the SIM chip numbering here I used this when I was sorting through my stack of SIMs in June: Top 3 are all IIfx per chip numbers and tattle tech reporting 32-bit clean. The top left does not boot...does anyone know if a SIM can reflashed? Here is the back of the SIMs...

Good news...the SeaSonic fired up the fully loaded IIsi without issue.  IIsi PS chassis is gutted other than the wires in from the SeaSonic.  I left the green PS ON in its ATX location and jumpered it to ground (you can just see the "U" made with white wire): I have the PS plugged into my...

THx for this @superjer2000. There is a daughter card that can be seen on the left side of both of my last photos. I wonder if that board could be salvaged and used for what you describe.

The plot thickens on my attempt to put the SeaSonic PS into my IIsi chassis.  As I was removing the stock wires I noticed that all 10 of my wires are filled. The photo shows the ground removed from position 5: Here +5 red (position 4) and ground (position 5) are removed.  Now there is a...

Yes, ATX12V Flex/Mini 1U This is the description on NewEgg

Exciting times.  My 2nd SeaSonic PS arrived today and is on its way into my IIsi: Stock entrails are on the left, SeaSonic out of its case are sitting nicely within the top part of the IIsi PS. My plan is to remove the stock entrails all except the plastic molex connector. I will remove the...

Stay tuned....I am going to be adding my questions to the thread you referenced @superjer2000

My 2nd is arriving tomorrow and will be used in my IIsi.