68kMLA Classic Interface

This is a version of the 68kMLA forums for viewing on your favorite old mac. Visitors on modern platforms may prefer the main site.

Click here to select a new forum.
Sourcing Apple Custom IC's
Posted by: Kai Robinson on 2021-01-07 11:14:18 I've had a bit of luck in sourcing old Apple Custom IC's using utsource.net - I thought i'd ordered some BBU's...turns out instead of ordering 344S0603-B's, i ordered 344S0063-A's, which is the SE/30's ASC chip... And they arrived, well packed, with a proper invoice, in PLCC packaging, they're not remarked, they're definitely NOS chips - proper ejection markings, too. I've searched UTSource some more and they have in stock: 344-0042-B - SE & SE/30 RTC Chip -- NEW 344-0062-A - SE SWIM Chip -- Reclaimed 343-0045-A - SE & SE/30 SND Chip -- Reclaimed All for reasonable prices. I'm taking a punt on about a dozen of each - for testing purposes, but could be a handy avenue for the Mac <insert model here> Reloaded projects 🙂 So, if anyone wants an ASC chip - let me know 😀
Posted by: maceffects on 2021-01-07 11:34:28 Here is a useful site for ASIC info including part numbers to search http://www.applelogic.org/APPLEASICs.html
Posted by: Kai Robinson on 2021-01-07 11:46:23 I know all about that site - used it for cross referencing a few times - but it's geared towards the Apple II, rather than the Mac's.
Posted by: maceffects on 2021-01-07 11:52:00 Seems like we should work on a Mac version then 🙂
Posted by: Kai Robinson on 2021-01-08 04:12:08 I have begun this process https://docs.google.com/spreadsheets/d/1NDIA5orTwraRmOUgzrKxWYXcf2AXdULkdwUm020HdXI/edit?usp=sharing
Posted by: demik on 2021-01-08 05:00:25 I know all about that site - used it for cross referencing a few times - but it's geared towards the Apple II, rather than the Mac's. A somewhat more complete version is available here : http://mess.redump.net/mess/driver_info/mac_technical_notes?s[]=mac&s[]=technical
Posted by: Kai Robinson on 2021-01-08 13:02:56 OK - we're two models in, and i've even made pinouts...in spreadsheet form [😀]
Posted by: cheesestraws on 2021-01-08 13:14:10 I have begun this process Whatever font you're using here makes capital As look like uppercase lambdas (Λ) and it's weirdly throwing me off
Posted by: Kai Robinson on 2021-01-08 13:15:37 Aaah - i'll switch to Roboto Mono - i was using inconsolata - my default terminal font 😀
Posted by: cheesestraws on 2021-01-08 13:23:22 Wasn't a complaint, more just an amused note; my eye read HA in HAL as ΗΛ (ηλ) and it was weirdly disconcerting to find a latin L after it. This suggests two things: firstly, I need to get better at compartmentalising alphabets in my head, and secondly I need to take the Greek electricity (ηλεκτρικός, beginning, you will note, with those two letters) company leaflet off my fridge (long story) because it's obviously starting to warp my mind... Thread hijack over, apologies.
Posted by: LaPorta on 2021-01-08 13:43:45 I wonder iif they have EGRETs...
Posted by: Kai Robinson on 2021-01-08 14:09:42 @LaPorta I just searched - nothing on there by default, but i can try and get an RFQ
Posted by: quorten on 2021-01-08 14:42:35 Interesting, I have to say I was somewhat surprised at first to hear that New-Old-Stock apple custom ICs are actually a thing. But I'm guessing it makes sense if you think a bit deeper... Apple may have been planning on making extras on the assumption that their techs might do precise, minimal component repairs (didn't really turn out that way in the field), so that's one thing. And then in their financial troubles in the '90's, maybe they closed a (secretive) deal to sell off their inventory of obsolete components to a Chinese no-name. Well, that's my guesses on how NOS ended up on UTsource. Might be worth asking about chain of custody of these components and see how reluctant they are to answer.
Posted by: Kai Robinson on 2021-01-11 08:45:37 ADB XCVR available! These work in: Classic, II, IIx, IIcx, IIci, SE/30 & Quadra 700
Posted by: Kai Robinson on 2021-01-16 04:24:08 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,
Posted by: CC_333 on 2021-01-16 09:21:42 Can these be reverse engineered and re-implemented somehow? I ask because, since the newfound supply of these is finite and will likely run out sooner than later, this seems like it would be an excellent opportunity to reverse engineer them without sacrificing working logic boards. c
Posted by: Kai Robinson on 2021-01-16 09:50:00 I'm happy to give up a handful of SWIMs to anyone that wants to reverse engineer them 😀
Posted by: Kai Robinson on 2021-01-21 08:30:04 PLCC44 SWIM's arrived and they, too, are genuine, new old stock.
Posted by: LaPorta on 2021-01-21 09:33:24 THe RTCs are gold - so many have been eaten or damaged over time.
1 >