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. | |
| Mac II Standby Mod | |
| Posted by: gonzo on 2016-04-16 01:33:18 Hello all, did some of you ever build a work around for the ugly standby battery in the Mac II's? Did industrially manufactured solutions ever exist which are worth for a replication? In the case there would be enough space to add a 5V power source (e.g. beside or beyond the harddisk mount) which could be powered from the AC input of the main power supply. Maybe there is even enough space inside the current power supply housing? I did not open it - yet. The AC-DC converter could be a cheap smart phone USB charger, A DC-DC converter from the China men in ebay would bring down the input to 3,6V, material value < 15€ / $. BTW: how do the power buttons on the ADB keyboards work? Greetings Florian | |
| Posted by: Juror22 on 2016-04-16 14:38:45 From the solution that you posted, were you just wanting something more user friendly than the original soldered in batteries, like there were in this thread? https://68kmla.org/forums/index.php?/topic/22866-mac-ll-battery-adapter/ Or something entirely without batteries? | |
| Posted by: Floofies on 2016-04-16 16:32:47 The ADB hardware spec distinctly reserves a whole pin on the Mini-DIN for sending that "power on" signal. Pin 2, I believe. That pin is connected directly to the PSU, no software interprets it at that point, so it's a pure hardware power-on button. | |
| Posted by: gonzo on 2016-04-17 05:08:46 Hi, I wanted something without batteries. My motherboard already has this dual battery circuit with an extra cpacitor. But it's good to know that the batteries are switched in series. Is the PWRON pin on ADB switched against ground our +5V for powering the system on? Greetings Florian | |
| Posted by: gonzo on 2016-12-18 06:58:42 Hi, I finally did the mod. I added a Samsung USB wall charger into the case of the power supply and added two additional wires which connect to the batteries on the motherboard. I don't care for the clock batteries, no machine in my collection has them because I'm too afraid to loose one again because of battery acid. The 5V is OK for powering up the Mac. This way was fully reversible, I did not have to drill or even cut a wire.     Greetings Florian | |
| 1 |