Reverse Engineering the Macintosh IIsi Logic Board

[Iesca]

If you could find it in your heart to share that missing page from the IIsi schematic, I'll be working on someone's boards soon. It's the LEFT page of the Audio circuit....

 

[mikes-macs]

I hope this is still in ongoing development. If you need any IIsi donor parts let me know.

 

[jajan547]

I hope this is still in ongoing development. If you need any IIsi donor parts let me know.

oooo Donor parts you say, can you send me a PM of what all you have?

 

[Trash80toHP_Mini]

I hope this is still in ongoing development. If you need any IIsi donor parts let me know.

Backburnered, but still actively pursued. Donor parts would be needed in Germany if and when.

 

[jajan547]

Backburnered, but still actively pursued. Donor parts would be needed in Germany if and when.

I have a lot of spare custom apple chips for the iisi

 

[Maxplayz51]

I actually need a replacement Macintosh iisi motherboard as mine has a lot of missing vias and traces from the PRAM battery leak it had. I've removed some ICs to clean the board but cleaning it makes no difference.

 

[Iesca]

@jajan547 Somehow @Maxplayz51 's board looks worse than the ones I looked at for you awhile back!

 

[Maxplayz51]

@jajan547 Somehow @Maxplayz51 's board looks worse than the ones I looked at for you awhile back!

Yeah I know. I wonder if anyone has one of the macintosh iisi motherboards?

 

[Guy Madison]

***** I bought the schematic from BOMARC years back, scanning, tweaking, printing and then cutting and taping it together into blocks I can see:

View attachment 37695

Memory controller, banks A&B along with Vampire Video buffering are already assembled in the visual cortex and set up in layers of AI files.

How correct is this schematic from BOMARC? I found out on the web...

 

[zigzagjoe]

How correct is this schematic from BOMARC? I found out on the web...

Better than nothing, but riddled with errors and a nightmare to read. You can reference the IIci schematic (attached) for some common functionality & to sanity check the Bomarc drawing.

 

[Trash80toHP_Mini]

Has anyone taken a shot at a IIsi ReMix as yet? One of those mangled into SE/30 form factor would rock.

 

[Guy Madison]

Better than nothing, but riddled with errors and a nightmare to read. You can reference the IIci schematic (attached) for some common functionality & to sanity check the Bomarc drawing.

Agreed.. a nightmare to read if you are used to using schematic design tools.

 

[Trash80toHP_Mini]

I kinda like the BOMARC schematics. My mind doesn't do "schematic design tools" whatsoever, so something that looks like an electron plumbing diagram works for me as well as anything can I guess. I look at "true" Schemnatic diagrams and only scratch my head in confuzzlemrnent.