If you can't get a true Indigo keyboard, I think you need an adapter like this
http://www.ebay.com/itm/SGI-Indigo-Onyx ... 23474743e2
This converts standard PS/2 keyboard and mouse for Indigo use. Incorrect keyboard and mouse can damage keyboard (and computer).
I haven't tried it myself.
As for the disk, you might get one of these working
http://www.ebay.com/itm/ACARD-AEC-7720U ... 3aad232ad3
but it is not so cheap as robespierre says.
An old SCA disk and one like this
http://www.ebay.com/itm/SCA-80F-IDC-50M ... 1c5451b71a
is much cheaper.
http://www.ebay.com/itm/SGI-Indigo-Onyx ... 23474743e2
This converts standard PS/2 keyboard and mouse for Indigo use. Incorrect keyboard and mouse can damage keyboard (and computer).
I haven't tried it myself.
As for the disk, you might get one of these working
http://www.ebay.com/itm/ACARD-AEC-7720U ... 3aad232ad3
but it is not so cheap as robespierre says.
An old SCA disk and one like this
http://www.ebay.com/itm/SCA-80F-IDC-50M ... 1c5451b71a
is much cheaper.