Thanks for the feedback mate! I was really hoping they'd help clear up the muddiness of my .TXTual ramblings.
I've added the "passive" SuperMac Adapter Card into the mix for a few reasons.
1) The thruholes for the unimplemented Zener Diode Packs are shown as populated, which provides over-voltage protection to the entire PDS chain. SuperMac decided this protection was unnecessary for their IIsi Video Card, but I'm making an attempt at adding a lot more circuitry than a single VidCard to the PDS.
2) I haven't looked at the changes in trace length that might be a side effect of changing the direction of the PDS connectors yet. It doesn't seem to have any effect upon the function of the Radius Color Pivot II/IIsi, but I haven't modified one of them for straight "stacking" the NIC or tested its function yet. The SuperMac Adapter's traces could be cut and patched to correct any timing issues should they arise.
3) Similarly, the "passive adapter" makes a handy "breadboard" for cutting and patching traces to re-arrange address/interrupt lines or implementing them on N.C. pins in the PDS spec. The latter will likely make timing for the "second NuBus slot" an issue, but a reversible, ugly, unreliable/noisy proof of concept hack on an inexpensive basement level board beats mucking around with the NuBus Adapter Card's traces by a large margin!
4) Strain relief. This is less of an issue now that I've decided to use a "wire wrap replacement socket" approach, but it is/was important for the less robust "machine pin hack." Four standoffs mounted to the thin, clear plexi "basement floor" makes swapping the PDS expansion cards around down there a lot less likely to induce borkage.
I'll have to give the SE/30 notion some thought, offhand I'd say the approach would be considerably less advantageous.
I've added the "passive" SuperMac Adapter Card into the mix for a few reasons.
1) The thruholes for the unimplemented Zener Diode Packs are shown as populated, which provides over-voltage protection to the entire PDS chain. SuperMac decided this protection was unnecessary for their IIsi Video Card, but I'm making an attempt at adding a lot more circuitry than a single VidCard to the PDS.
2) I haven't looked at the changes in trace length that might be a side effect of changing the direction of the PDS connectors yet. It doesn't seem to have any effect upon the function of the Radius Color Pivot II/IIsi, but I haven't modified one of them for straight "stacking" the NIC or tested its function yet. The SuperMac Adapter's traces could be cut and patched to correct any timing issues should they arise.
3) Similarly, the "passive adapter" makes a handy "breadboard" for cutting and patching traces to re-arrange address/interrupt lines or implementing them on N.C. pins in the PDS spec. The latter will likely make timing for the "second NuBus slot" an issue, but a reversible, ugly, unreliable/noisy proof of concept hack on an inexpensive basement level board beats mucking around with the NuBus Adapter Card's traces by a large margin!
4) Strain relief. This is less of an issue now that I've decided to use a "wire wrap replacement socket" approach, but it is/was important for the less robust "machine pin hack." Four standoffs mounted to the thin, clear plexi "basement floor" makes swapping the PDS expansion cards around down there a lot less likely to induce borkage.
I'll have to give the SE/30 notion some thought, offhand I'd say the approach would be considerably less advantageous.