Is this thread still alive ?
Im also interested in cryptonight miner for my old GTX 260 ( it's compute 1.3 i think...)
Can't find anything working ...
Will someone be so nice an compile a ccminer for those old nvidia cards ?
I have no clue how to do this

You must use mining software from when they supported the older compute versions see my old post in this thread. I got cudaminer 2014-02-28 to run on the same card you mentioned. Look on github under release for older releases and see what compute level they support. Good luck hobby mining.
I have similar issues. I can get cudaminer to run but no submitted shares. ~5-15 Kh/s on my gtx260m. using
cudaminer 2014-02-28cudaminer.exe --algo=scrypt:1028 -o stratum+tcp://coinminers.net:3288 -u Cf744PafTaz7uPykbqHY8dqE1GQpP32PiG -p password -i 1 -l L28x1 -C 1 -H 2
(coin above is ChanCoin some LTC copy coin)
Have an LTC .bat that will run and submit on the machine but yield no results(Global h/s is to high for my small h/s for payouts).
cudaminer.exe --algo=scrypt -o stratum+tcp://ltc.pool.minergate.com:3336 -u EMAIL@Email.com -p x -C 1 -H 2
The SMX of my card is 14.
Have switched up the --algo=scrypt sometimes.. works as well still no submits.
Have tried a few other -l options. -l L14x2 -l L14x1 -l L14x3 -l L28x3
Some do not validate on cpu with the kernel options.
I have lots of other hardware with similar specs and am currently not paying for electricity and would like to get them up and running. Does anyone know of cuda GPU miner that is compute 1.x compatible?
Second question...
How can I add an algo to an existing miner?
Ex. I have cudaminer and would like to include the Cryptonight/cryptolight Algo.
cudaminer is dated can I do this?
I want to add cryptonight to a compute 1.x miner?