I chopped the top off the Gemini Card, so the assembly will fit inside the IIsi . . .
Nothing changed, behavior is exactly as before. There are three possible states when the hacked Gemini Card is inserted into the IIsi NuBus Adapter:
A - Radius Card installed in top slot - Unserviceable Slot Interrupt
B - No NuBus Card installed - boots normally
C - Radius Card installed in bottom slot - boots normally
In Case C: If the Radius card were hooked up to the monitor, it would probably have the splash screen up from the ROM, but no comms with the MoBo, I did a screen shot and there's nothing in the Video Dump but the 12" RGB Display's window, as expected.
At any rate, now it fits!
This shot is a bit closer to the Illustrator diagram:
That's enough for today. I started to look at the signals on the PDS and NuBus in Illustrator. Gotta figure out which IRQs, 1, 2 or 3 to hack onto the Gemini Card and how the rest of the PseudoSlot assignment for each slot needs to be tweaked to work with the IIsi. That'll leave one open IRQ for a PDS card underneath the MoBo. I'm thinking about using the Futura IISX/10bT daughtercard for the second NuBus slot if it works out and the RCP2/IIsi card for a decent MoBo monitor under RocketShare if I can get the Rocket to take over the Futura's screen.
Lots of playtime ahead on this silly hack, but it just might pan out! :approve:
Nothing changed, behavior is exactly as before. There are three possible states when the hacked Gemini Card is inserted into the IIsi NuBus Adapter:
A - Radius Card installed in top slot - Unserviceable Slot Interrupt
B - No NuBus Card installed - boots normally
C - Radius Card installed in bottom slot - boots normally
In Case C: If the Radius card were hooked up to the monitor, it would probably have the splash screen up from the ROM, but no comms with the MoBo, I did a screen shot and there's nothing in the Video Dump but the 12" RGB Display's window, as expected.
At any rate, now it fits!
This shot is a bit closer to the Illustrator diagram:
That's enough for today. I started to look at the signals on the PDS and NuBus in Illustrator. Gotta figure out which IRQs, 1, 2 or 3 to hack onto the Gemini Card and how the rest of the PseudoSlot assignment for each slot needs to be tweaked to work with the IIsi. That'll leave one open IRQ for a PDS card underneath the MoBo. I'm thinking about using the Futura IISX/10bT daughtercard for the second NuBus slot if it works out and the RCP2/IIsi card for a decent MoBo monitor under RocketShare if I can get the Rocket to take over the Futura's screen.
Lots of playtime ahead on this silly hack, but it just might pan out! :approve: