I found a commodore 128 in a mates shed, no PSU tho

Nathan · Post by **Nathan** » Sun Oct 14, 2012 12:59 am

I found a c128 in a mates shed, does anyone in Australia have a power supply I can use to test it?

GreyGhost · Post by **GreyGhost** » Sun Oct 14, 2012 7:24 am

I don't know about Australia, but here in the states, an Amiga power supply works well too for the 128. I like the Amiga power supply cause it has a removable fuse and an extra on/off switch.

6502dude · Post by **6502dude** » Sun Oct 14, 2012 7:52 am

Try - http://www.commodore128.org/
It is a good source of info on the C128 platform and several members are located in Australia

RobertBe · Post by **RobertBe** » Sun Oct 14, 2012 3:41 pm

GreyGhost wrote:...an Amiga power supply works well too for the 128.

Not unless you modify the Amiga p.s.. An Amiga p.s. outputs 5 and 12 volts DC; the C128 p.s. outputs 5V DC and 9V AC.

Truly,
Robert Bernardo
Fresno Commodore User Group
http://videocam.net.au/fcug

GreyGhost · Post by **GreyGhost** » Mon Oct 15, 2012 8:29 am

It does work. Might be messing up the 128?

Boray · Post by **Boray** » Mon Oct 15, 2012 10:39 am

GreyGhost wrote:It does work. Might be messing up the 128?

It has maybe blown a fuse inside, or possibly smokes things you connect to the user port.

Nathan · Post by **Nathan** » Mon Oct 15, 2012 5:02 pm

UPDATE: Found the PSU yesterday and the C128 works but it has garbled characters on the 128 mode, and an out of memory in 0 error in 64 mode

RobertBe · Post by **RobertBe** » Mon Oct 15, 2012 6:57 pm

GreyGhost wrote:It does work.

Excerpt from Ray Carlsen's article found at

http://personalpages.tds.net/~rcarlsen/ ... tester.txt

(for C64, substitute C128)

"Loss of the 9VAC will produce a blank screen on early C64s even though the red LED is on and the +5 volts is normal. Because the circuitry inside the later C64C is different, loss of the 9VAC or an open fuse inside the C64C will still allow the computer to work! However, you will not have sound, the cassette will not work, and there will be no TOD clock source for the CIA chips, so some programs may not work."

Truly,
Robert Bernardo
Fresno Commodore User Group
http://videocam.net.au/fcug

RobertBe · Post by **RobertBe** » Mon Oct 15, 2012 6:59 pm

Nathan wrote:UPDATE: Found the PSU yesterday and the C128 works but it has garbled characters on the 128 mode, and an out of memory in 0 error in 64 mode

Ah, that is not a PSU problem.

Check Ray Carlsen's C128 diagnostic page at

http://personalpages.tds.net/~rcarlsen/ ... 128-ic.txt

Truly,
Robert Bernardo
Fresno Commodore User Group
http://videocam.net.au/fcug

Nathan · Post by **Nathan** » Mon Oct 15, 2012 10:16 pm

Thanks, i checked it and it turns out its a bad character rom in 128 mode and bad ram chips in 64 mode