CRX230ed oem version w/o s/w



I have just purchased a sony crx230ed as an oem unit (by mistake) and found that it came with no installation instructions and no s/w. I have installed it into my windows ME m/c and find that it functions more or less ok as a cdrom drive but i cannot write to it. It has firmware 4YSI. I have adaptec DirectCD on the m/c but it does not recognise the drive as CD RW.
Any clues as to how to proceed?