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Are there Chips on your PowerCache Adapter? HELP REQUEST


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#1 Trash80toHP_Mini

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Posted 28 November 2016 - 05:51 PM

I'm developing a “truth table” based upon the presence of ICs on PowerCache adapters for various Macs or the lack thereof for comparison to other available data.

 

Presence of chips (assumedly PAL or CPLD ICs) indicates an adapter is ACTIVE

Lack of chips on an adapter indicates that it is PASSIVE.
 

Here is the info on the adapters I have in hand or info from pics I've found online:

SE/30-adapter is ACTIVE

IIsi---adapter is ACTIVE

LCIII--adapter is PASSIVE: no chips on board

 

Posting high resolution pics here of both sides of your adapter would be awesome! Such would be also make a great contribution to the NuBus Mafia project over on applefritter.

 

Pics found online indicating presence of chips on specific adapters would also work! Posting such here would be greatly appreciated.

 

If you've previously owned a PowerCache/Adapter combo or seen one, identification of a specific Mac's combo as represented in this family tree might also suffice!

 

ViBPwx.jpg

 

I've also posted a WTB for a IIsi or SE/30 PowerCache adapter. I've got a spare LCIII adapter and OODLES of other trade goods as further enticements for a deal.

 

In advance, thanks much for any help you can give me in this endeavor.


Edited by Trash80toHP_Mini, 28 November 2016 - 06:26 PM.

jt [8]
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#2 Trash80toHP_Mini

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Posted 29 November 2016 - 05:57 AM

I found a pic of one that said it was for the Macintosh II

 

Z1EFPi.jpg

 

Probably so, it looks like it plugs into CPU and MMU sockets, can anyone confirm?


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#3 olePigeon

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Posted 29 November 2016 - 08:57 PM

Yes, it plugs directly into the two CPU sockets.



#4 trag

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Posted 29 November 2016 - 09:07 PM

LC, LCII, CC, various 4xx series performas:

https://www.prismnet...adapterCard.jpg
https://www.prismnet...CadapterBox.jpg

Mac II Adapter:

https://www.prismnet...acIIadapter.jpg

Mac IIX Adapter (note plcc chip in lower left region):

https://www.prismnet...cIIxAdapter.jpg

#5 Trash80toHP_Mini

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Posted 29 November 2016 - 09:21 PM

Thanks much, trag! Results there are consistent with my working assumptions.

 

You should check out the doozy of an SE adapter mcd posted: klugemonsterSE


jt [8]
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#6 Bunsen

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Posted 03 December 2016 - 12:25 PM

IIcx - passive, CPU socket


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#7 Trash80toHP_Mini

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Posted 03 December 2016 - 02:13 PM

Thanks for that confirmation, B. I had one and can't find it, but that's what I recalled.

 

Results so far:

 

AFAIK, every Mac that has an implementation of Slot ID $E in any form except the LCIII and IIci require active adapters.

 

IIci doesn't count because its implementation of cache memory space (possibly NuBus SuperSlot memory space is involved?) and $E implemented in NuBus are compatible by (definition) design.

 

LCIII is a special case because its PDS is an oddball hardware implementation of a full '030 PDS connector at Slot ID $E. Installation of the PowerCache adapter in its PDS precludes any other use of $E, hence no possible conflict and its passive adapter.

 

Members of the Mac II series have NuBus implemented in Slots $9-$E. The IIci is an oddball, with slots $C-$E implemented in NuBus.

 

IIcx follows the pattern of its big brother the IIx, implementing the first of its three NuBus slots at $9-$B. No implementation of Slot ID $E is made as a physical slot or a pseudoslot in its design. No possible conflict there means only a passive adapter is required for the PowerCache.


Edited by Trash80toHP_Mini, 03 December 2016 - 02:56 PM.

jt [8]
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