mg.man
Well-known member
Ahh... sorry... I'm away from mine, so assumed (wrongly) they had external floppy ports...
Sourcing Apple Custom IC's
- Thread starter Kai Robinson
- Start date
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.
Hello! I very need one 344-0062-A chip, can you sell one? (and i can't send PM to you
)Kai Robinson
Well-known member
Hi, sorry i have only one of these left. I have developed a PLCC to DIP SWIM adapter, but i've not yet tested it.
Lyokian159
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 |
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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.
demik
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.
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.
I'm based in Scotland but happy to cover international postage.
Many thanks,
Craig.
Scott Squires
Well-known member
@quorten has firmware for replacing the SE / SE30 RTC with an ATTiny85.
github.com
macsehw/firmware/rtc at master · quorten/macsehw
Macintosh SE Hardware Designs. Contribute to quorten/macsehw development by creating an account on GitHub.
github.com
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!@quorten has firmware for replacing the SE / SE30 RTC with an ATTiny85.
macsehw/firmware/rtc at master · quorten/macsehw
Macintosh SE Hardware Designs. Contribute to quorten/macsehw development by creating an account on GitHub.
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!
Kai Robinson
Well-known member
The package in the datasheet is PLCC-20. The DIP-8 pinout is shown here: https://docs.google.com/spreadsheets/d/1NDIA5orTwraRmOUgzrKxWYXcf2AXdULkdwUm020HdXI/edit?usp=sharing
@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.
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.