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>I visited the IBM tech site and noted that there is a special up-graded >system board for a 720C with the 240 HD. I am wondering if anyone knows >what is involved in making this swap? Do I need to located a used system >board? Or, do I have to replace a bios chip or something like that? Does >anyone know where the necessary used parts might be located. > >Thanks in advance for your help, Wayne Wright > > > The 700 and 720 are Microchannel machines. MCA is really fast, and I like it, but upgrading can be a major hassle. If my memory serves me correct, those machines use ESDI drives which are NOT innerchangable with IDE or EIDE. You may want to opt for an exernal SCSI drive if you need the extra space. Regards, Paul