Can anyone tell me how to convert a matrix system from a SR1/SR2 module into something compatible with SR3 matrix rules please?

Thanks,

A rough guide to converting system maps to matrix 2.0
CPU's & SPU's (& perhaps SAN's if they're noted as choke points with many IC) become hosts of the listed colours and ratings.
SM's, I/O ports & DS merge with the CPU/SPU they are linked with on the system map.
Use the supplied notes to carry over flavour, IC, paydata, special tricks etc. and amend all ratings as necessary to suit your game.

If you need more let us know of any module you have in mind with a system map in it.