simon@hhb.UUCP (simon chan) (04/04/89)
I believe my Commodore64's power supply is bad. I can only get the 5 volt DC but the 9 volt AC is not there. I need help to locate one of the following item: (a) a (very very cheap) power replacement for the Commodore64. It cost more then the computer itself, if I get a new one. (b) a transfomer which convert the 120v AC into 9v AC. So I can cut the cable and put the patch 9v. (c) a way to jump the Commodore64 to use DC only. I don't understand why the stupid thing need 9v AC. many thinks! Simon Chan 201-848-8000 princeton!hhb!simon
brendan@jolnet.ORPK.IL.US (Brendan Kehoe) (04/05/89)
In article <185@hhb.UUCP> simon@hhb.UUCP (simon chan) writes: > (a) a (very very cheap) power replacement for the Commodore64. It cost > more then the computer itself, if I get a new one. Service Merchandise has a power supply with plug-ends for the 64, Vic, and 128 for about $20-$30, last time I saw it...a friend of mine's running a BBS with one, and it hasn't died yet (knock knock). -- Brendan Kehoe brendan@cup.portal.com | GEnie: B.KEHOE | Oh no! I forgot to say goodbye brendan@chinet.chi.il.us | CI$: 71750,2501 | to my mind! brendan@jolnet.orpk.il.us | Galaxy: Brendan | - Abby Normal
jgreco@csd4.milw.wisc.edu (Joe Greco) (04/07/89)
In comp.sys.cbm article <185@hhb.UUCP>, simon@hhb.UUCP (simon chan) wrote: > (b) a transfomer which convert the 120v AC into 9v AC. > So I can cut the cable and put the patch 9v. Try Radio Shack. I did. I think I ended up with an 11VAC unit which works just fine. > (c) a way to jump the Commodore64 to use DC only. > I don't understand why the stupid thing need 9v AC. The AC is used for the clocks, and to generate some voltages inside the machine. Additionally, many user port devices need it. It can probably be "fudged" if you have a 12VDC supply and a little creativity. Anybody made a DC -> AC circuit and made a portable 64? -- jgreco@csd4.milw.wisc.edu Joe Greco at FidoNet 1:154/200 USnail: 9905 W Montana Ave PunterNet Node 30 or 31 West Allis, WI 53227-3329 "These aren't anybody's opinions." Voice: 414/321-6184 Data: 414/321-9287 (Happy Hacker's BBS)
jbh@mibte.UUCP (James Harvey) (04/19/89)
In article <1893@csd4.milw.wisc.edu>, jgreco@csd4.milw.wisc.edu (Joe Greco) writes: > In comp.sys.cbm article <185@hhb.UUCP>, simon@hhb.UUCP (simon chan) wrote: > > (b) a transfomer which convert the 120v AC into 9v AC. > > So I can cut the cable and put the patch 9v. > > Try Radio Shack. I did. I think I ended up with an 11VAC unit which > works just fine. > > > (c) a way to jump the Commodore64 to use DC only. > > I don't understand why the stupid thing need 9v AC. > > The AC is used for the clocks, and to generate some voltages inside > the machine. Additionally, many user port devices need it. It can > probably be "fudged" if you have a 12VDC supply and a little > creativity. Anybody made a DC -> AC circuit and made a portable 64? > -- > jgreco@csd4.milw.wisc.edu Joe Greco at FidoNet 1:154/200 > USnail: 9905 W Montana Ave PunterNet Node 30 or 31 > West Allis, WI 53227-3329 "These aren't anybody's opinions." > Voice: 414/321-6184 Data: 414/321-9287 (Happy Hacker's BBS) There was a series on converting the C64 to 12 volt operation in Computer Trader Magazine (or CTM, now defunct) in 1987. For an AC supply, find one of the surplus Coleco supplys, part PS 72559 (there are other part numbers but this is the most common). A lot of 64 users here in Detroit are using these, they are stiff enough to run two 64's at once. Plus five volts is available and you use the transformer winding originally intended for the minus 5 volt supply to furnish 9 volts AC. These supplys go for around twelve bucks. -- Jim Harvey | "Ask not for whom the bell Michigan Bell Telephone | tolls and you will only pay 29777 Telegraph | Station-to-Station rates." Southfield, Mich. 48034 | ulysses!gamma!mibte!jbh