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Dunno, I've wrapped this borken test unit project up until I feel the need to bodge connections on one of my three slot PC Risers. Daniël has done so, but not had the ability to test it yet. I'll just tag along after his lead. There's really no utility in attempting to convert CommSlot II to...

Couldn't resist Slot_E1 kluge: Started getting flaky results and now none. Must have broken a connection on the CableMonster which is going into retirement. I think my TwinSlot Riser project has had its schematic adequately confirmed, so I'm back onto that track again. Curiosity satiated. ☺️

LOL! Glad you like it. It's the one machine in original case I have that's got room for the A/B/C Riser if I switch the 6500 board out for 6400. That started back in 2010. All pics went the way of the great pixel robbery, but for the few I'd documented of its previous incarnation with 10" Color...

Love it! I've got a vacuum forming rig set up on a wooden frame dropped into a 5 gallon bucket. Plexi was too thick, but managed one really good one, but not perfect enough for me. Oven heating induced bubbles in the Plex was the problem. To-do on that project is a more conventional heating...

I just watched that Macintosh Plus video in one sitting. Amazing, truly amazing. First thought is to mod the front bezel model to Twiggy/DVD spec. The rear of the case would be modified with an opening for removable panel for customization in lieu of printing one in the bucket. Fitting a custom...

Cool! Very interested in seeing that happen. The CRT curvature of the Apple Macintosh 12" RGB Display for the LC is 9all but?) a dead-on match for the Lisa Bezel. I think it's likely the elephant eared, improved CC that is the 5xx series will turn out to be a match as well. My theory would be...

All four interrupts are tied together on the motherboard for Slot_A and on my test riser for all three configurations. Sot_B1 is implemented on Apple's 6x00 Riser just as I've implemented. Can't imagine any reason for Slot_C1 to behave any differently than that OEM riser's Slot_B1.

Mythical no more . . . . . . after 5 years 1 Month and 22 Days! 🤪 Worked on the first try, thanks to one and all! :)

Finally ready to start soldering jumper wires in the AM! Need to doublecheck everything, was pulling my hair out this afternoon. 🤪

Latest doodling at work. Not complete, but gives a good idea of testing methodology.

Nice! Out of curiosity, might that model scale to fit a Lisa bezel? Front bezel is all I have. Curvature matches the 12" RGB ZaTopper.

Much improved CableMonster Riser test rig. Still boots into Slot A1, tested after every single modification. Next step is to solder all the breadboard jumper wires, Female/Slot, Male/Edgecard as on the bundled Interrupt lines on gray wire. Need to document the improvements made so far to the...

Indeed, I thought that's what I'd said, thanks for the input if it wasn't clearly stated. Not working from the 6500 schematic, was curious is all. Chipping away at the Riser and possible provision for Slot_C by drawing parallels from the Slot_B implementation. Daniël gave me some great feedback...

Once @trag confirmed that Apple took the Reserved pin shortcut to decoding Slot_B Interrupt along with, my initial discovery of Request line bodge to Request on Slot_B on the 6x00 Reserved I was off to a good start I usually study the Block Diagrams: Gazelle Alchemy But that approach...

First, thanks much for translating my diagram into TXT. I'm visual to a fault, needing to see the traces to grok circuits and have great difficulty making myself understood in the forums when limited to TXT. Many years ago at the MLA, I posted a diagram and was encouraged to do so as it helped...

Thanks much. CSII only needs one interrupt signal, which is equivalent to Slot_B on the Apple Riser, where INTA-INTB are tied together and connected to one of the Reserved lines of the PCI spec. Is OHARE documented somewhere?

A little history of this insanity: Riser is same for Alchemy and Gazelle. Nefarious, Appleish Reserved Line perversion of the PCI specification on the undocumented Riser was discovered by myself some five years ago. At the time I was beginning to look into my TwinSlot Riser Project for 6360...

Took the day off to play with the woodworking tools. Soldering/Hot Air Rework Station is shaping up nicely! :D Haven't updated this one to reflect Reserved Pin A11 being wired to all four Interrupt lines yet. B10 and A19 Reserved Lines are hooked up to Request and Grant as suggested by Daniël...

The 6x00 two slot Riser is indeed specific to Alchemy/Gazelle and definitely does weird stuff: https://68kmla.org/bb/index.php?threads/three-slot-riser-for-6400-in-search-of-the-mythical-slot-c.31510/post-338992 Apple was involved in the development of NuBus with MIT et al. So of course in...

There it is, "Reserved" Pin A11 of the PCI Spec is defined in the 6500 schematic as Interrupt for Slot_C, or so it would seem! A9 is defined as I buzzed out on the Riser for Slot_B as well. A11 = PCI_SLOT3_INT (7,12,21) A9 = PCI_SLOT2_INT (7,21) Dunno what the numbers mean, but that's...