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#1 2016-11-28 18:29:12

jt
Member
From: Bermuda Triangle, NC USA
Registered: 2014-05-21
Posts: 1,391

Are there Chips on your PowerCache Adapter? HELP REQUEST

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.

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#2 2016-11-28 22:59:41

mcdermd
Member
From: Corvallis, OR
Registered: 2014-05-12
Posts: 946
Website

Re: Are there Chips on your PowerCache Adapter? HELP REQUEST

Here is a weird one I have, jt:

pClPisY.jpg
ngD34Wx.jpg

Here's a link to them embiggened:

http://imgur.com/a/E7znr


Daily Drivers: 27" iMac 2.8 GHz Quad-Core i7 (Late 2009), 21.5" iMac 2.7GHz Quad-Core i5 (Late 2013), 11" Macbook Air 1.6 GHz i5 (Mid-2011)
See the restored heroes here.

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#3 2016-11-28 23:26:29

jt
Member
From: Bermuda Triangle, NC USA
Registered: 2014-05-21
Posts: 1,391

Re: Are there Chips on your PowerCache Adapter? HELP REQUEST

HOLY CRAP! yikes SE 68000 to IIci Cache Slot adaptation with RAM expansion for the Universal PowerCache?

I'm going waaaaaaay out on a limb and guessing it's an ACTIVE Adapter, but not sure it pertains to my truth table. THX, mcd, I needed a wake me up shot right about now! big_smile


p.s. do you remember which adapter you sent to me? Still looking for it. roll

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#4 2016-11-29 06:07:01

jt
Member
From: Bermuda Triangle, NC USA
Registered: 2014-05-21
Posts: 1,391

Re: Are there Chips on your PowerCache Adapter? HELP REQUEST

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?



@mcd: still can't get over that SE adapter, how many amps do you think that tricked out kluge pulls?

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#5 2016-12-07 13:24:54

jt
Member
From: Bermuda Triangle, NC USA
Registered: 2014-05-21
Posts: 1,391

Re: Are there Chips on your PowerCache Adapter? HELP REQUEST

Bunsen confirmed that the IIcs PowerCache adapter is passive. 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.
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From this, I think it's pretty safe to say that unraveling the mess of the SE/30 and IIsi video implementation at $E as compared to the IIci's implementation of NuBus at $E would be the way to begin understanding the workings of their slot adaptation mechanism. First guess is that it has to do with where cache is addressed in slot space memory?

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