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Sourcing Apple Custom IC's
Posted by: Kai Robinson on 2021-01-21 09:43:29
Yep - and thats some of the cheapest and most abundant apple customs that i've found on UTSource.
Posted by: trag on 2021-01-21 19:02:38
Sadly, they don't have the FAT AMIC.   :-(

343S0148
Posted by: Kai Robinson on 2021-01-22 11:54:04
Sadly, they don't have the FAT AMIC.   :-(

343S0148


What's that one for?
Posted by: Scott Squires on 2021-01-22 20:39:07
As far as I can tell from various SWIM-related documents, there have been at least 3 versions of the ASIC. Would be nice to figure out which versions correspond to which part numbers. (It also seems like Apple used different part numbers for each Mac model, even if it was the same chip? Also different packaging of the same chip.)
Posted by: Kai Robinson on 2021-01-23 04:30:41
@anthon SWIM, SWIM II and SWIM III - I ordered a few SWIM III's for a giggle.

I just received 8 x 343S0440-B's - the PLCC version of the DIP 343-0440-B ADB Microcontroller. They're used on the II, IIx, IIcx, IIci, SE/30 & Quadra 700, i'll be making a DIP adapter for them. Saves reverse engineering them - although at £9 each they're not cheap...my CC is getting rinsed this month! 😀

DSC_0460.JPG
Posted by: Kai Robinson on 2021-01-23 04:39:47
One of the other nice things i've ordered? 40 x 343S0788 CUDA Chips - marked as New Old Stock...I know these sometimes fail so...anyone need one? @LaPorta i know you were looking for an Egret - does a CUDA have the same pinout/functionality?
Posted by: Bolle on 2021-01-23 04:52:26
does a CUDA have the same pinout/functionality?
Pinout yes, functionality no. A CUDA won't work as a direct replacement for the Egret - at least not the CUDAs I tried so far.
Posted by: trag on 2021-01-25 16:45:43
What's that one for?
It's the FAT AMIC on the PowerMac 9150.  It's one of the primary parts of the chip set.   A 208 pin QFP.   The thing is, it's the essential component that allows 5 NuBus slots on a NuBus Mac.  All the 3-slot NuBus PowerMacs use the plain AMIC.   If I had a source of FAT AMICs (without killing 9150s) I might try to create the I/O board for the Power Computing Power 120 which enables 5 slots.  As shipped it supported three slots, but had headers for five slots.
Posted by: trag on 2021-01-25 16:47:11
Pinout yes, functionality no. A CUDA won't work as a direct replacement for the Egret - at least not the CUDAs I tried so far.


I'm not sure which are CUDAs and which are Egrets.   I just wanted to mention that I've replaced an 0788 with an 0060, or maybe the other direction and it seemed to work fine.
Posted by: Bolle on 2021-01-25 20:28:46
Interesting. I would have to check again what chip I did use exactly.

I remember I was working on a Classic II so the original part was a 341S0851.

0788 would be a CUDA (found in Nubus PowerMacs) and 0060 is a CUDA as well found in late Quadras, PPC Performas, Gossamer. So those two have been CUDAs at least.

Taken from the MESS website:

341S0060	Cuda (v2.40)	Performa/Quadra 6xx, some PMac x200, PMac x400, some PMac x500, Pippin, Gossamer G3

341S0262	Cuda v3.0	some PMac x500, Bondi Blue iMac

341S0285	Cuda Lite	ADB and PS/2 support - PMac 4400 & clones

341S0417	Cuda		Color Classic

341S0788	Cuda (v2.37)	PRAM, RTC, ADB

344S0100-01	Egret (v1.00)	IIsi

341S0851	Egret (v1.01)	PRAM, RTC, ADB

341S0850	Egret (v1.01, earlier)	PRAM, RTC, ADB; IIsi and LC
Posted by: Kai Robinson on 2021-01-30 07:34:46
Ok, got a huge list of ASIC's in front of me, and a very large order from UTSource...

I've also been updating that google sheet with more pinouts. I'll sort out the Classic II next. 
Posted by: rplacd on 2021-01-30 07:59:52
Ok, got a huge list of ASIC's in front of me, and a very large order from UTSource...

I've also been updating that google sheet with more pinouts. I'll sort out the Classic II next. 
If you're planning to become the one-stop shop for unobtanium Apple chips, what if I threw you a couple of dollars to support ya? I think we'll need a lot more of these as time goes on..
Posted by: thegarse on 2021-08-12 11:37:11
Interested in 1 of your swim chips Kai, part number 344S0061-A if you still have some.
Posted by: LaPorta on 2021-08-12 12:03:26
I think he may have jumped ship on the site...
Posted by: thegarse on 2021-08-13 08:19:00
Ah, thanks for the heads up. I think all signs are pointing to the swim chip on my SE 30 restore. I may just poach one from another II or IIsi.
Posted by: mg.man on 2021-08-13 10:10:02
FWIW, the SWIM chips Kai had sourced were the DIP ones... pretty sure you need the PLCC variety for an SE/30...
Posted by: olePigeon on 2021-08-16 13:08:28
Just curious as no one answered: if the SWIM chip is cloned, would it be possible to reintroduce daisy chaining like on the original IWM? Or would it require additional special hardware to do that with a SWIM? Or is it just impossible?

Just wondering. Would be nifty to be able to daisychain floppy drives on a Mac if we had a modified SWIM clone.
Posted by: mg.man on 2021-08-16 14:11:51
I appreciate this does not answer the "chaining" question... bit I know a SWIM supports at least two floppies. I have a dual [800k originally] floppy SE I've upgraded with SWIM and a pair of internal 1.4Mb drives - the SE has two internal ports.

I don't think I've tried a third drive on the floppy port as well, but you'd think it should work? I'll be happy to test - but that will have to wait until next week when I have access to my SE.
Posted by: olePigeon on 2021-08-16 14:31:47
@mg.man I know that daisy-chaining doesn't work. I've tried it on my IIci. I believe it's only possible on the Apple II series of computers.

You can have more than one floppy drive, provided there is more than one physical connection (i.e. one internal and one external like on the IIci, or two internal like on the Macintosh II.) What I don't know is if a modified SWIM chip could correctly identify two different floppy drives on the same connector like it can on an Apple II.
Posted by: mg.man on 2021-08-16 15:33:10
You can have more than one floppy drive, provided there is more than one physical connection
well... "technically"... don't the II, IIx, IIfx(?) and SE all have three physical connections? 2 x internal and the 1 x external?
Posted by: olePigeon on 2021-08-16 20:44:18
I think the SE is the only one with three connectors (2 internal, 1 external.) There's no external floppy connector on the II, IIx, and IIfx, only 2x internal.
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