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Thanks for bringing this thread back to the surface at an opportune moment! Turned 70 in June and first two Social Security checks hit the bank on the first, so the wait for this project mentioned above is over! 😁 I can now begin to figure out what's required for setting this up. Just ordered...

TGIF, this Sunday night. ;) IRL I'm in Sitka, Alaska's time zone with my internal date line 48 hours off kilter, but it works for me. 🤪 Finally got quite a bit done on converting the CableMonster above from Slot A to Slot B status! If that breadboard setup is successful, I've got the markers...

Resistor . . .

https://pages.mtu.edu/~llsutter/appendices/frame.html Frame Capture Board, pretty ho-hum kinda thing, nothing interesting like VidCap. Looks to be Macintosh II era tech.

Fabulous achievement, props! :cool:

Ok, just made some headway! Now I need a little help: _ WTF is a resistive connection to an address line? _ How can I implement it on the Ribbon Cable Riser? Was planning to put a tap line on the four address lines @trag defined on the SuperMac ABC Riser above and suggested for CSII. Does this...

Printed out the MLA thread for highlighting/markup. Getting my head together, which is quite the project in itself. :oops:

Back to basics . . .

Next steps . . .

Got the test setup up on the yesterday! No joy, but very interesting results for further experimentation. Successful test boot with single slot riser cable based Test Setup with no card installed. Using a USB card that was ready to hand: - came up as unrecognized card in Slot A1 per...

Test setup done on PCI side of things yesterday. Got interesting results, got WONKY results this morning! 😮 So it was back to basics this afternoon. Looks like diagram above is in error. I was pulling the GRANT line on pin 17 to ground on pin 18. Du-oh . . . :oops:

Research steps done, time to build the Slot C search testbed setup. Waiting for one more part to arrive. To recap: as you can see in the 6400/6500 PCI Riser, slot selection for Slot A is done in the "usual" way. It's Apple's way, not following PCI spec just as they failed to follow the NuBus...

Test setup shaping up.

CS!!-2-PCI

Yeah, I know it wouldn't get far past 10/100 performance, but it's a game of inches under OS9 on Alchemy/Gazelle. ;) Your CSII 10/100 card will most certainly the way to go in almost every actual case. My flights of fancy are many times impractical and only other crazies would be interested in...

Noodled out a knuckle dragger level test setup. 😬 First difference I spotted in my quest to put a two slot PCI riser in my 6360 was the REQ line anomaly on the 6400 PCI riser: 1) Slot A connects to REQ pin B18 as expected. 2) Slot B REQ line connection is made to RESERVED pin B14 on the PCI...

Spinning tangent off into its own thread: https://tinkerdifferent.com/threads/mythical-slot-c-in-the-6400-alchemy-architecture-csii-insanity.3692/

@Androda got me entangled back into the web of CSII/PCI insanity with his amazing CSII 10/100 card project, so spinning off the tangent. Genesis of the Quest for the 3rd PCI Slot in the 6400 Alchemy architecture over at the MLA some six years ago: "In another thread, @trag mentioned that his...

Sorry @Androda methinks my nose is stuck too far into your topic with this CSII<->PCI tangent. Looks like @trag and I were playing around with this stuff six years ago over at the MLA. I'll start a new topic over here. luckily the pics and diagrams are intact as they predate the catastrophe...

Sweet, now I know what to do with my current obsession: Instead of making the PCB a CSII TAM Riser, I'll figure out how to do a RA PCI adaptation so the card hangs off the board opposite the PCI slot(s) for testing purposes. I'll play with it to see if things will fit into the 10cm SEEED...