Thread

Repairing a Radius 16 Accelerator (Plus)

Repairing a Radius 16 Accelerator (Plus) 68k 14 posts Jan 31, 2015 — Jul 29, 2023

View original thread

#1 Sat, 31 Jan 2015 - 19:58

Hello all,

I just want to share my experience regarding a newly acquired Mac Plus. It was flup-flup-fluping when I bought it and to my surprise it had the Radius 16 accelerator! I uninstalled the Radius 16 and discovered that the Mac worked fine without it. After troubleshooting, I discovered that the +12v was being shorted to ground by the accelerator and after further troubleshooting I discovered that the 150uf capacitor was shorted and the rectifier diode (!N5822) was also shorted. After replacing these components the accelerator is working...See pictures...

View attachment 5320

#2 Sat, 31 Jan 2015 - 20:24

hey that is a pretty sweet upgrade, what all does that bad boy give you?

#3 Sat, 31 Jan 2015 - 20:28

16mhz 68020, this card has an fpu installed...The question mark at boot flashes at double the speed!

#4 Sun, 1 Feb 2015 - 03:08

nice! the radiusware image is available to download and install the extensions

#5 Sun, 1 Feb 2015 - 18:31

Yeah, I got the software, but as a downside, this accelerator will only run up to system 7.0. But it's still pretty cool...

#6 Mon, 2 Feb 2015 - 02:39

What a flimsy power supply. Can't even blow up a shorted tant.

#7 Mon, 2 Feb 2015 - 05:15

It looks like this card takes 12v from the mac and regulates it's own 5v...