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Super rare Macintosh II Daystar PDS adapter

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I came across a super rare Daystar PDS adapter for the Macintosh II.  This sucker converts an 030 + FPU into a PDS slot.

 

If I ever come across a boxed Macintosh IIx, this would be the only machine that'd replace my IIci as my regular workhorse.

 

I've never seen one of these adapters before.  Since I already have the expensive part (the Turbo 040), I figured I might as well get the adapter.  You never know. :)

 

Still on the lookout for a Daystar Turbo 040 box.  I'd like to get the box.  I have the card, manuals, disks, etc., but no box. :(

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Congrats. It is a hard thing to find. I would not mind having such an adapter but I do not have the machine to put it in. As Is, my Mac IIci is also my workhorse for it too has the 040 DayStar in it as well. Between that and my IIfx... well I'm still trying to decide which machine is the stronger of the two.

 

If I'm right, it can also work on the SE\30 if the CPU is on a socket.

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Now wait, what?  If I'm reading that right, this plugs into the sockets of the 030 and the FPU on the logic board and gives you a PDS slot?  Wha?  Suppose you could upload a picture of that thing?

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The II is a slow 68020 so it would need a speed boost the most. Oddly enough I have 2 of the rarer IIx machines but still have not snagged a plain old II.

 

There is also a LC version which I have that plugs into the PDS port.

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Huh. So you'd *HAVE* to use a PDS accelerator card, since there's no place to put the CPU+FPU back in!  I guess since most PDS cards *ARE* accelerator cards, it makes sense, it just looks odd. You'd think a pure CPU upgrade would have been more popular than needing a separate "PDS adapter" and CPU upgrade...

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I have one in my II also. I think I put in an 030 from Daystar. Cool thing is the ability to swap card as they are found with such an adapter. Meaning the accelerator itself is specific to the II. The II card will not work on all IIs since the first run does not have a fully-pined MMU socket. It was pin-specific to the chip used. Making PMU upgrades impossible on those boards. A silent recall replaced many of them.

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The Mac II starts off with System 4 and this card (along with the Turbo040) allows the Mac II to run a 68040 chip at 40MHz.

Not at all bad for System 4, when a 16MHz 68020 was considered fast (as, no doubt it was, back in 1987).

Has anyone tried this?

Is it actually possible to run System 4 on a 40MHz 68040?

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System 4 should run, its not like the 68040 broke much more than the 68020 did with regards to software. In related fun, I know that System 7.5.5 runs like greased lightning on a 450Mhz G4 with 256MB of RAM (upgraded PM8600) :p

Edited by NJRoadfan

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System 4 should run, its not like the 68040 broke much more than the 68020 did with regards to software. In related fun, I know that System 7.5.5 runs like greased lightning on a 450Mhz G4 with 256MB of RAM (upgraded PM8600) :p

Except that the 040 FPU is an incomplete implementation that relies on a bit of code from Motorola supplied with the OS to emulate the rest.

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I'm interested in the idea of an expansion for LC040 machines with a FPU add-on...unless the 030 compatible FPU is even harder to find than a 33MHz full 040.

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I don't think they're compatible.
 

Wouldn't the FPU in the 68040 interfere with the 68882 (unless you have a LC 040 with no FPU)?

 

No, I think the system just ignores the off-chip FPU.
 

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