Editing Dragon 32/64 (section)

===Disk systems===
[[File:DeltaDos Top-xavax.png|thumb|Delta DOS Interface ]]
First to market was a complete disk operating system produced by Premier Microsystems, located near [[Croydon]]. The system was sold as the "Delta" disk operating system; there was a proposal for Dragon to market this as an addon. Dragon did not enter into such an agreement and instead produced the DragonDOS system. The two systems were incompatible.

Delta's lead in availability ensured that software was released in the format, whilst Dragon's "official" status ensured that it, too, gained software published in its format. This led to confusion and frustration, with customers finding they had either purchased a version incompatible with their setup, or that the software was only available for the competing standard.