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Sourcing Apple Custom IC's

Kai Robinson

Well-known member
I had initially sourced the DIP28 package ones, yes, but UTSource lists the PLCC version as available, if you need one. I also made an adapter for PLCC to DIP, for the SE project, as a test.
 

monoxrom

Member
Latest acquisitions!

GENUINE NoS 3430045A's (Sony SND Chip)

GENUINE NoS 3440042B's (RTC Chip for SE & SE/30's)

Refurbished, used 344-0062A's (SWIM Chip, Harris branded with 1990 Date Codes) - These look to be genuine, just the tops have been skimmed and re-printed - not a cheap job, these won't rub off with alcohol.

So if anyone needs one - ping me a DM,



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Hello! I very need one 344-0062-A chip, can you sell one? (and i can't send PM to you :( )
 

Lyokian159

New member
Hi all, just tried to get a RTC chip from UTsource but it seems they are all out. Does anyone have a spare they would be willing to sell?


Thanks for your inquiry , we checked our stock, but regret to let you know so sorry no parts.If any other new inquiries, you can browse our website : www.utsource.net



Part NumberQuantity
3440042BNo Product
 

trag

Well-known member
Hi all, just tried to get a RTC chip from UTsource but it seems they are all out. Does anyone have a spare they would be willing to sell?


Thanks for your inquiry , we checked our stock, but regret to let you know so sorry no parts.If any other new inquiries, you can browse our website : www.utsource.net


Part NumberQuantity
3440042BNo Product

Yeah, but their website says they have 33,951 of them in stock.

And it said the same three weeks ago when I tried to place my order for them.

There's very little relationship between their website and reality.

Still, I would like to get some of the Logic 53C80 chips, but grrrr.
 

trag

Well-known member
IIRC Logic claims their chips are faster than the standard parts, I think that's what @trag wants to test

Exactly. Plus the Logic 53C80 on utsource's site is under $2 each, which is nice. And it's one of the parts for which their site is actually accurate. Or it was a few weeks ago.

https://www.utsource.net/itm/p/11998118.html

There's a couple of sentences in Logic's datasheet that claim exact compatibility but better performance.
 

Attachments

  • Logic 53C80.pdf
    334.4 KB · Views: 1

craig1410

Member
Hi, I'm also looking for at least one, ideally two 3440042B RTC chips for the SE/30. I've sent a fresh inquiry to utsource but sounds like I'll get told the same as others that they are not available.

I'm based in Scotland but happy to cover international postage.

Many thanks,
Craig.
 

craig1410

Member
@quorten has firmware for replacing the SE / SE30 RTC with an ATTiny85.

Thanks for that Scott, very much appreciated. I've been looking out for a data sheet for the Apple RTC chip but could never find one. It certainly occurred to me that it should be possible to reverse engineer the chip but without knowing how it works that seemed difficult. Looks like most of the work has already been done! :)
 

trag

Well-known member
Thanks for that Scott, very much appreciated. I've been looking out for a data sheet for the Apple RTC chip but could never find one. It certainly occurred to me that it should be possible to reverse engineer the chip but without knowing how it works that seemed difficult. Looks like most of the work has already been done! :)

Please let us know how that turns out. And how difficult/easy it ends up being. Challenges?
 

Kai Robinson

Well-known member
Thanks for that Scott, very much appreciated. I've been looking out for a data sheet for the Apple RTC chip but could never find one. It certainly occurred to me that it should be possible to reverse engineer the chip but without knowing how it works that seemed difficult. Looks like most of the work has already been done! :)
 

Attachments

  • PRAM-Clock.pdf
    1.5 MB · Views: 11

craig1410

Member
Thanks Kai, that's very useful. Even though the package in the data sheet is different to the 8 pin DIL on the SE & SE/30, the functionality appears to be the same. Nice!(y)
 

trag

Well-known member
@Kai Robinson No "WOW" button, so I'm just going to type it out. WOW!

Any other Apple datasheets kicking around? I think the PCI Macs are a little later than you typically work on, but I'd love to find datasheets for Apple's Grand Central and Hammerhead chips. 343S1125 and 343S1190.
 
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