You wrote in January: " Wonderful, thanks much for the information!!! Due to financial concerns, I am selling my IBM 5100 (sigh) on Ebay. Most of the tapes were DC300A, and the extra ones I have are the DC600s. I am in the process of duplicating the tapes, 1) so I can keep a set of the Patch and Games tapes in case I can ever afford another one :), and 2) to make sure the tapes are readable. Thanks again! " Did you sell it? I'm looking for such a unit. Thanks Emmanuel