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#1 2014-10-21 22:30:55

uniserver
Member
From: Sf, Mi
Registered: 2014-05-15
Posts: 956
Website

The most durable version of the Macintosh II

APPLE           820-0228-A      II   ( this is version with PLCC NUBUS chip ) 
Macintosh_II_motherboard.jpg


all radials.  the only thing to do is change the PRAM batteries...
but those are VARTA, so they might even still be good.


I have a couple of these, Just found out last night.
Kind of nice not needing a re-cap... well at-least for now.

Last edited by uniserver (2014-10-21 22:31:57)


#I Re-Cap √Mac √NeTX √Amiga Boards - A/B - PSU# (MacCaps.com)  Modern SCSI HD's - For Old Macs - Pre Cfg'd - 10k RPM! 73gb!! $50 + free shipping  -- Mac 128K Re-Ram kits (16 Chips) $35 + shipping, Floppy Issues?-> Bourns Filter Solution 128k - SE/30, $16 + shipping

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#2 2014-10-21 23:03:27

jt
Member
From: Bermuda Triangle, NC USA
Registered: 2014-05-21
Posts: 1,407

Re: The most durable version of the Macintosh II

Isn't that the memory controller ASIC next to the socketed PMMU? Near the back there's a row of what looks to be a standard set of TI NuBus Transceivers.

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#3 2014-10-22 04:22:46

uniserver
Member
From: Sf, Mi
Registered: 2014-05-15
Posts: 956
Website

Re: The most durable version of the Macintosh II

I have the schematics do you want me to check?  smile


#I Re-Cap √Mac √NeTX √Amiga Boards - A/B - PSU# (MacCaps.com)  Modern SCSI HD's - For Old Macs - Pre Cfg'd - 10k RPM! 73gb!! $50 + free shipping  -- Mac 128K Re-Ram kits (16 Chips) $35 + shipping, Floppy Issues?-> Bourns Filter Solution 128k - SE/30, $16 + shipping

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#4 2014-10-22 04:45:00

IIfx
Member
From: VA, USA
Registered: 2014-09-07
Posts: 92

Re: The most durable version of the Macintosh II

Could you shoot me the schematics? I love tech diagrams like that...the block diagrams in Apple Dev Notes are fun but not that detailed.

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#5 2014-10-22 06:58:36

jt
Member
From: Bermuda Triangle, NC USA
Registered: 2014-05-21
Posts: 1,407

Re: The most durable version of the Macintosh II

Sure, I'm just guessing from appearances. If that's NuChip next to the Black PMMU, the gang of four across the back would likely be  transceiver pairs for each three-slot group, or so would my guess go.

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