Need to purchase eprom 1.27and installation instructions and whatever comes with it. for alesis masterlink 9600, I have contacted Alesis, they are too slow at service at this time.

You might want to try the link I have below and it's for free download.

Just click_here so that you will be redirected to the exact site.

Thanks.

If you are very sure that the problem you are facing is generated from eprom only then go ahead with this.
As per my experience the best way to replace eprom is to find a similar motherboard with similar eprom version and replace the eproms.
You can also buy a eprom from the market but again you will have to program that eprom for which you will need the eprom programmer, an electronic device which feeds a script in eprom and also you will require the script.