Mythical Slot C in the 6400 Alchemy Architecture & CSII Insanity

I've got a great start on buzzing the 6x00 riser. Have to recheck my findings, but it looks like nine signals only make it up to Slot A from the motherboard connector. One of which is perplexing, B18 in the PCI Spec is +5V. What gives. my mistake of something AppleFishy?

Attachments:
Buzz-Lines-012A.PDF (160.5 KB)

Trash80toG4
Active Tinkerer
Bermuda Triangle, NC USA
--------
Joined: Apr 1, 2022
Posts: 1,131
Likes: 329

Sep 5, 2024 - #24

Closing in just a bit. First step will be setting one of my cable risers up as Slot_B which check board design for my TwinSlot Riser project.

[Image: Alchemy-QuadSlot-001-DELTAX.jpg]

Second step will be playing musical signals with the three remaining Reserved Pins on the Logic Board connector. If that pans out and Slot_C is brought out of the crypt it'll be on to yet another blivet stuffing, a TriSlot Riser for the 6x00 drawer is looking more and more possible the more I stare at it. [grinning-face-with-o]

Attachments:
Alchemy-QuadSlot-001-DELTA.PDF (143.8 KB)
Alchemy-QuadSlot-001-DELTAX.jpg [View]

Trash80toG4
Active Tinkerer
Bermuda Triangle, NC USA
--------
Joined: Apr 1, 2022
Posts: 1,131
Likes: 329

Sep 5, 2024 - #25

Tonight's Dirty Vodka Martini Powered utter simplification of the DELTA requirements for Slots B & the Mythical Slot C:

Somebody please give me some feedback here! MLA thread has had some serious input in the last week or so:

Three Slot Riser for 6400 - In search of the Mythical Slot C

The connector at the bottom has 194 pins, 97 on each side. The pins aren't numbered in silk screen, so for my purposes, I numbered them from left to right on the front. On the back, I did not flip the card over. Pretend you're looking through the board, oriented as above, and the back...

[Image: 68kmla.org] 68kmla.org

Attachments:
Deltax.PDF (124.7 KB)
4xBreadboard.jpg (54.8 KB)
68kmla.org [View]

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