68kMLA Classic Interface

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Q840av gets a make over
Posted by: ArmorAlley on 2026-06-09 23:30:59 View attachment 86195I simply cut a big hole across the ports with a cutting disk, the id is normal 840av as I’ve put a jumper on the led connector 😀🍎 What you need is to make (or have made) a custom bezel with a 3D printer.
Posted by: s_pupp on 2026-06-13 05:04:47 Does the motherboard have a label for the connector in your Power Mac 8600? Is it J20? In the Power Macintosh 9600 schematics, J20 is called "Product LED" and has 5 pins. https://www.macdat.net/repair/apple_schematics.html The five pin power LED header is labeled J38 on my Kansas PM8600. The LED I'm using does indeed have the loop to tell the board that it's in a tower case. All these years I'd thought it must have been the power supply that provided that information, and couldn't understand why my current "desktop 8600" identifies itself correctly.
Posted by: joevt on 2026-06-13 16:49:50 The five pin power LED header is labeled J38 on my Kansas PM8600. The LED I'm using does indeed have the loop to tell the board that it's in a tower case. All these years I'd thought it must have been the power supply that provided that information, and couldn't understand why my current "desktop 8600" identifies itself correctly. My Power Mac 8600/200 is also J38. My Power Mac 8600/200 does not have either BoxID bits tied to the centre pin (/BoxPD). In the 9600 schematic, BoxID(1) and BoxID(0) are hard coded as 01 (a pull-down and a pull-up resister). The 9600 schematic shows /BoxPD is not connected to anything - the R121 pulldown resister is marked "NO STUFF".
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