Mmm... 'with an expansion...' = yet more cost. 😞
I was one of the early backers, thankfully at a very low cost. After delay after delay and the lack of transparency of what was supported out of the box, tallying up the total cost of what was likely (but not 100% clear) needed to support my...
Looks like someone else ran into one a while back...
Thread 'Strange Power Supply in SE/30' https://68kmla.org/bb/index.php?threads/strange-power-supply-in-se-30.5589/
I think you'll find the memory has been replaced with MT1258 256k chips, so that 74F253 is likely the additional address decoding. If working, you should have 512k RAM.
Fascinating 'board! Following with interest!
> It was never produced, and designer Rich Page left Apple to work at NeXT shortly after his design "lost" to the slotted Mac II.
Perhaps someone should reach out -- https://www.linkedin.com/in/rich-page-270b3a and share a pic?
Have you considered going this route...
IMO that's a great price on the adapter. Of course, you'd need to find an accelerator, but that would result in a much quicker A/UX machine...
Full thread the above came from here -
'FS: Turbo 040 + Mac II adapter'...
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