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| Looking for Motorola MC68851 PMMU for Macintosh II |
Posted by: LeSpameur on 2025-05-02 06:15:03
Hi everyone,
I’m looking for a Motorola MC68851 PMMU chip to upgrade my Macintosh II. The machine currently runs with a 68020 and I’d like to enable full virtual memory support, ideally to run A/UX or other OSes requiring a PMMU.
If you have a working MC68851 (preferably tested or NOS), or a scrap board that includes one (like a Motorola MVME132 or similar), I’m very interested.
I’m located in France, and willing to pay via PayPal (goods/services) and cover shipping.
Also open to trades if you’re into vintage Mac parts.
Thanks in advance,
Hugo |
Posted by: finkmac on 2025-05-02 06:21:53
that's a hard to find part |
Posted by: LeSpameur on 2025-05-02 06:53:52
that's a hard to find part I know, sadly… I’m also looking for a IIfx board. I already have one, but it’s completely destroyed by a leaky Maxwell battery. I’d like to make a recreation board, but a couple of ICs are too far gone. |
Posted by: mg.man on 2025-05-02 07:01:21
Have you considered going this route...
Were you looking for the Turbo040 or the Mac II adapter specifically?
I have more Mac II adapters currently available at 50€ + shipping. IMO that's a great price on the adapter. Of course, you'd need to find an accelerator, but that would result in a much quicker A/UX machine...
Full thread the above came from here -
'FS: Turbo 040 + Mac II adapter' https://68kmla.org/bb/index.php?threads/fs-turbo-040-mac-ii-adapter.48907/ |
Posted by: LeSpameur on 2025-05-02 08:08:22
Have you considered going this route...
IMO that's a great price on the adapter. Of course, you'd need to find an accelerator, but that would result in a much quicker A/UX machine...
Full thread the above came from here -
'FS: Turbo 040 + Mac II adapter' https://68kmla.org/bb/index.php?threads/fs-turbo-040-mac-ii-adapter.48907/ I don’t have an accelerator; it’d probably cost more than a whole IIfx anyway. My total budget is about $50. |
Posted by: Unknown_K on 2025-05-02 10:22:10
Find something with a 68020 thats dead and strip it from there. I don't see where else you are going to find that part with that budget.
Whole working IIfx are $500-1000. |
Posted by: ObeyDaleks on 2025-05-02 10:47:56
Keep in mind, you’ll also need PAL RAM SIMMs, not just regular 30pin RAM. Last I heard, they were unobtanium. |
Posted by: LeSpameur on 2025-05-02 11:30:53
Find something with a 68020 thats dead and strip it from there. I don't see where else you are going to find that part with that budget.
Whole working IIfx are $500-1000. Just looking for a pcb, not working of course (it’s too easy otherwise ;-)) |
Posted by: LeSpameur on 2025-05-02 11:41:38
Keep in mind, you’ll also need PAL RAM SIMMs, not just regular 30pin RAM. Last I heard, they were unobtanium. I already have that from my dead board. By the way I’m using it as decoration!
The 68882 isn’t gone, I’m using it in my Mac II. |
Posted by: ObeyDaleks on 2025-05-02 12:14:31
I already have that from my dead board. By the way I’m using it as decoration!
The 68882 isn’t gone, I’m using it in my Mac II. I was referring to Mac II, not IIfx. You need PAL RAM for Mac II (in addition to the PMMU). |
Posted by: LeSpameur on 2025-05-02 13:00:03
I was referring to Mac II, not IIfx. You need PAL RAM for Mac II (in addition to the PMMU). But only to add more than 8 megs, right ? |
Posted by: Unknown_K on 2025-05-02 13:22:24
But only to add more than 8 megs, right ? Yes. |
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