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| SE/30: IIsi NuBus Card might work in Artmix adapter?????? |
Posted by: Trash80toHP_Mini on 2017-10-27 09:45:05
From the PM thread about ProtoCache1 development:
. . . Bus Mastering appears to be the problem with using the IIsi NuBus adapter in the SE/30. DCaDftMF details the differences in memory(?) addressing as being the same issue we're facing here. The signals involved seem very familiar.
<snip>
Dumb@$$ WAG: the IIsi Nubus adapter might not work, but I'll bet a nickel that it won't bomb the SE/30 during POST if it's installed in Artmix's DiiMO adapter clone.
Come to think of it, that might be a down and dirty test of the Bus Mastering Theory! If anyone could test the IIsi NuBus adapter in an SE/30 PowerCache adapter it would be a big help in two of my favorite SE/30 projects. If you get any better result than:
/monthly_01_2017/post-902-0-81107400-1485112589.jpg">View attachment 11408
I would LOVE to hear about it. I've tested the IIsi adapter in the SE/30 numerous times in Project30 - IIsi NuBus adapter in SE/30 trials - take 3
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Posted by: Trash80toHP_Mini on 2017-10-27 15:35:50
Bolle:
IIsi adapter in TwinSpark is not going to work because BR/BG is "broken" by the TwinSpark.
NUTS!!!!! :-/
edit: hrmmmm???? I'm still wondering if the SE/30 might still POST with the NuBus adapter in the passthru slot even if it can't function under the DiiMO/Artmix adaptation?
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Posted by: Trash80toHP_Mini on 2017-10-28 10:04:54
Dumb@$$ WAG Mode™
Theory on IIsi (or any other chipset implementation) NuBus Adapter/PowerCache in SE/30:
PowerCache works in the IIci
DayStar made a IIsi PowerCache adapter with a NuBus Slot
PowerCache runs the show in any IIci Cache Slot or Adapter for it
Can it be considered as doing so independently of its host system?
if so: could we buffer the PowerCache to talk to one isolated slot that's NOT strictly an SE.30 PDS Passthru so that memory operation signalling on the buffered/isolated PowerCache <-> "IIsi" conversion slot for the NuBus Adapter would be handled with IIsi memory control and NuBus signalling instead of the SE/30 Memory control signalling whenever the PowerCache is talking the "special bus" connector to the NuBus Chipset?
Simplified?????
This would amount to buffered A/B switching of PowerCache memory and general control line operations as if it were in a IIsi adapter state or an SE/30 adapter state whenever necessary.
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