68kMLA Classic Interface

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Getting G3 Whisper Perch USB working
Posted by: croissantking on 2023-03-09 15:55:34 This is just a work in progress, but will it be helpful?
Posted by: CC_333 on 2023-03-09 15:59:16 A microscope controller and video capture card? Don't be silly! What really needs to go in that slot is an adapter to interface with the systems of a highly advanced rocket ship!! c
Posted by: croissantking on 2023-03-09 16:04:00 No notch needed if they just cross the package from left to right. It's the same either way up. But U1 on the Belkin, the 2052 chip, looks like it has a notch
Posted by: Phipli on 2023-03-09 16:18:52 But U1 on the Belkin, the 2052 chip, looks like it has a notch Sorry, I meant U2 (I can't see what U1 is in the photo I'm looking at) was of interest, then I worked out it was an overcurrent protection chip, it meant it isn't equivalent to the filter that LP2 is part of. LP2 isn't a 2053.
Posted by: Phipli on 2023-03-09 16:19:43 Don't be silly! What really needs to go in that slot is an adapter to interface with the systems of a highly advanced rocket ship!! c But I don't have one of those cards. Are they available for 5v PCI slots? I only have NuBus cards like that.
Posted by: NJRoadfan on 2023-03-09 18:09:34 A high quality scan of the Rev A iMac logicboard might reveal some clues.
Posted by: croissantking on 2023-03-09 23:09:00 A high quality scan of the Rev A iMac logicboard might reveal some clues. Who can help? 🙂
Posted by: zefrenchtoon on 2023-03-10 01:27:37 Sorry, I can't help but I can provide an external view of the USB equipped personality card I saw on FB. Guess who shared the picture on FB ...? 😉
Posted by: joevt on 2023-03-10 01:39:16 There is no USB bus shown at the top of the window, but maybe I'd have to populate more of the supporting circuitry to get that to show? Do you have USB drivers installed? Aren't they not installed by default in classic macOS unless a USB controller exists? Does ioreg in Mac OS X show more info?
Posted by: croissantking on 2023-03-10 02:31:56 Do you have USB drivers installed? Aren't they not installed by default in classic macOS unless a USB controller exists? Does ioreg in Mac OS X show more info? I do. I actually tested the donor card out right before starting to move parts, and it was fully working including showing the USB bus in ASP.
Posted by: mg.man on 2023-03-11 03:18:51 In case it helps...
Posted by: croissantking on 2023-03-13 03:27:05 Sorry, I can't help but I can provide an external view of the USB equipped personality card I saw on FB. Guess who shared the picture on FB ...? 😉 Is there any way to get the new (or old) owner to send a hi-res photo of their personality card? I’ve been working on the card populating various things, but no progress yet in terms of functionality, other than the machine sometimes restarts if I plug in a USB cable. I selected resistors labelled 103 because that’s what the donor card uses near the USB ports, but I don’t know if those values are right for the Apple card, or how mission critical using the correct value of resistor is for a circuit like this.
Posted by: croissantking on 2023-03-13 03:31:54 In case it helps... View attachment 53503 This is like the one I bought as a donor card. I see it doesn’t have a protection circuit installed, instead using fuses - the CMD 0870 documentation offers three different methods for over-current protection, with fuses being the cheap and cheerful option, but less reliable than using an IC.
Posted by: finkmac on 2023-03-13 07:13:02 Is there any way to get the new (or old) owner to send a hi-res photo of their personality card? Good luck. These buyers/sellers generally want to keep as much secret as possible to increase the "rarity" and "value". See also: the PenLite. There's a bunch of working prototypes of it around, and not a single archived copy of the disk/OS from one. I'd love to be proven wrong, however 😁
Posted by: zefrenchtoon on 2023-03-13 07:20:54 Sorry @croissantking no more info on the card. 🙁 As @mg.man I can try to help you by sharing the USB part of the Yikes motherboard. Maybe it can help:
Posted by: mg.man on 2023-03-13 07:48:40 A high quality scan of the Rev A iMac logicboard Not sure it's "high"-enough, but pretty sure mine's a Rev.A :
Posted by: Phipli on 2023-03-13 08:00:46 Not sure it's "high"-enough, but pretty sure mine's a Rev.A : View attachment 53597 Ever tempted to add ADB and a floppy drive?
Posted by: mg.man on 2023-03-13 08:06:13 Not atm, but know it can be done. A long time ago (probably 25yrs or so) I created a hack-a-Mac with a iMac 233 in a slimline PC case after the analog board died. The PSU in the slimline case then died, so it went on a shelf. One day I'll drag it out and get it working again. The pic above is from another '233 that had the analog board die... Don't have any current plans for that one - but it was handy for grabbing a pic. 🙂
Posted by: croissantking on 2023-03-13 11:32:26 @mg.man @zefrenchtoon What are the resistor values used, I can't quite see?
Posted by: mg.man on 2023-03-13 11:43:19 Can you point out where? I'll try to get a closeup.
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