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From: "Jack Followay, Jr." <[e-mail]>
Newsgroups: comp.sys.cbm
Subject: Re: wtd: info on Lt kernal DOS
Date: Fri, 09 Aug 1996 09:16:13 -0500
Organization: PowerHouse Productions
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[e-mail] wrote:
>=20
>    I need two things 1. the 7.2 operating system on disk in a normal
>     format,* i have had trouble decompressing the files in the past*

  I have it normal, zipped, arced, etc.  Question is how to GET it to
you.

>     2. I need info from someone who knows how to install the 7.2 on
>     the LT K's controller, as i understand ,it the controller has to
>     be fooled into thinking  7.1 is still in place because of the
>     serial number that it looks for on starup, im assuming the serial
>     no. has to be transfered to the 7.2 software prior to installing
>     on the drive, so i need someone to tell me how to do it.
>=20

  Yes and no.  It's not really as complicated as that.  Do you need to
format the drive?  What SIZE drive is it?  (that's the complicated part,
if any).  More info would be helpful.

-JackLF
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From: Raymond Carlsen <[e-mail]>
Newsgroups: comp.sys.cbm
Subject: Re: Is my C=3D64 dead?
Date: Fri, 9 Aug 1996 08:12:08 -0700
Organization: University of Washington
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To: Gareth Owen <[e-mail]>
In-Reply-To: <[e-mail]>

> I have three 64's (old shape) and one 64C, from car boot sales (US
> garage sales?) that all appear to have the same problem - the red
> LED is lit when switched on, the TV goes black/green then nothing!
> I've tried with a psu that I know works, could this be the PLA chip?
> If so, where is it located?

There are quite a few chips in the computer, any one of which will
give you a black screen on power up. You've already eliminated one
possible cause by swapping power supplies. Note that a bad supply can
damage chips in the computer, which will then not work with a good
supply. The PLA chip is the most common failure in the C64. It is one
of several large chips that normally run very hot. The PLA is marked
as U17 on the PC board, at least on all the C64s I've seen. It's part
number could be CBM 906114-01, 82S100PLA, or 93459DC.

> Getting repairs in the UK seems a little tricky (unless anyone can
> help there?).  Will trying chips from my working 64 in the faulty
> machines damage my working chips - or does this depend on the
> original fault?

That's a very good point. Unless you have a bad power supply that is
burning the chips out, installing a good chip in a "dead" computer
should do no harm. However, it may not always tell you what the
problem is. What if you have more than one bad chip in there?  The
best way to check a suspected "bad" chip is to test it in a working
board. I have one C-64 with all the major chips socketed that I use as
a "test" board. Now when I want to check a dead board, I remove chips
one at a time and test them. Now I'm -sure- I'll never put back a
defective chip by mistake. It saves a lot of time and "tail chasing".

> Is there anywhere on any ftp or www sites on troubleshooting? I've
> had a brief look but cannot find help on faulty machines?

Not that I know of. Most of the help you will see is from this very
newsgroup. There are a few old books on the subject of repairing the
C64 and 1541 drive. Some things you can repair yourself, and some
require technical help. I give as much information as I can here to
help fellow Commodore users, but if the problems get very complicated,
you will need to find a local user group (or a friendly technician)
to give you a hand. Distribution of information is what the user
groups are all about. Parts for the C64 are still available from
several sources in this Country, but stock is shrinking. I'm not sure
what the situation is in other Countries... probably the same.
Obviously, no new parts are being manufactured. Almost everything is
surplus. One company that still sells new parts and has worldwide
sales is Jameco Electronics. They are based in California, USA.
Toll free (USA): 1-800-831-4242
International orders: 1-415-592-8097
FAX Toll free (USA): 1-800-237-6948
International FAX: [phone]

Ray Carlsen
CARLSEN ELECTRONICS... A leader in trailing-edge technology.


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From: Richard Trissel <[e-mail]>
Newsgroups: comp.sys.cbm
Subject: CCCUG Aug. '96 N/L
Date: Fri, 9 Aug 1996 10:39:22 -0700
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