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So why is Riser Slot_B, INTC wired to Reserved_A9? I'm down to only a single reserved line unaccounted for on the motherboard connector. Hoping that'll act in the same manner as Reserved A9 -> INTC does for Slot_B when connected to INTA, INTB or INTD?

Thanks! Toying with the notion of getting CSII converted to PCI on one of the CABLE Risers for laughable playtime later or in the morning. It's on the way to checking out Slot_B conversion on the Riser and then on to Slot_C shenanigans. Still curious how "INTA#, INTB#, INTC#, INTD# wires...

Curiouser and curiouser . . . If interrupt lines are tied together on the logic board, how does this compute? Do all, or only Bridge 3 have Direct Access to Memory Controller? Screenshots from the 1996, first edition of DPCIaDfPMC linked in previous post. Which is devoid of later...

CSII->PCI Oddities?

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...

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. 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...

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?

Very cool stuff. I've been enchanted by the notion of putting the electronics for adapting a 24v Dewalt power tool battery into my work light. A printed case for the electronics in order to slide the battery into like the real deal tool would be better. Came up with the notion when I built a...

I had some PGA connectors in stock so I checked if they'd fit the 6360/5x00 and TAM risers I've been working on. Daniel over at the MLA suggested implementing a PCI device on the 6x00 Riser. Is there a better way than PGA to mount a PCI daughtercard on a riser in a DrawerMac?

Well that may have been ridiculous, but it made a good start for exploring Daniël's notion of implementing a PCI Card on the 6400 riser. Maximized PCB Real Estate study with PGA Prototyping interconnect for development. SATA seems to be the consensus for such things. Looks to be a bit of room...

Went a little wild on the 6360 side of things today. 😁 In the day, I bent the harness backstop on the bottom of the Optical Bay up and removed the speaker so I could slide a full length Radius Thunder card thru above the harness. Elongated TriSlot Riser should do the same from the looks of...

6500 Schematic availability helps a lot!

THX, will check out. Comparing these 1996 pages to the 1999 revision ATM.

1996 2nd Edition: https://wiki.preterhuman.net/Designing_PCI_Cards_and_Drivers_for_Power_Macintosh_Computers Has anyone seen a link to the 1995 first edition of DPCICfPMC?

Found another Reserved Pin used as an alternate input for Slot B. Apple! :rolleyes: Slot A on the 6x00 riser connects to A7-Interrupt _C as might be expected. However slot B connects instead to A9-Reserved as opposed to any standard PCI setup. So we have Interrupt_C and Request lines for...

Thanks for the confirmation. Have plans in place to knock together a test frame with easy access to both sides of drawer/harness boards.

Thanks, that's a very helpful answer in the negative. I'll check the discussion out and your video as well. I've wondered about that for quite some time, but I've never had much interest in the CC. When it was covergirl'd on one of the Mac mags I thought it was hideous and definitely not a...

Time to start playing breadboard checkers soon. 1 - test that cable riser works 2 - test Slot B connections 3 - explore turning CSII into a full PCI Slot by snatching signals Long shot will be locating the signals for Slot C. @trag and I are wondering if Apple didn't implement a connection from...

Oops, didn't specifically mention switching to from surface mount to thruhole connectors. Dot pitch of PCI is the same as Nubus on the solder side. Solder and component sides are each splayed out to a pair of staggered rows. The soldertail pins will keep everything in alignment mechanically...

Splitting NuBus connector toward the centerline and soldering the thruholes with a PDC Cardfor alignment works a treat. Same should work for your SMT connector? What's the width of the CC/TV/550/575 logic boards? Same as the 630 & its offspring? Got another trick up my sleeve for the test setup. ;)