Talk:Multiuser DOS

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Concurrent CP/M Release 3.1 and Concurrent DOS Release 3.1 appear to be the same product[edit]

Introduced as the "PC-MODE" module at December 1983 COMDEX, scheduled for release in March 1984, "shipped early" on Feb. 21, 1984, or "released in early March" – unclear "who" it was shipped or released to (manufacturer, marketing department or actual OEM customers). Then rebranded and re-anounced in May 1984 as Concurrent DOS Release 3.1. – Wbm1058 (talk) 18:29, 19 April 2013 (UTC)

As far as I know, the very difference is the inclusion of the PC-MODE module, which was an optional part of Concurrent CP/M-86 3.1 in late 1983, whereas it was included in Concurrent DOS 3.2 since 1984. Until some years ago, I was living under the impression that the BDOS 3.1 system was always called Concurrent CP/M-86 (with or without PC-MODE) whereas the BDOS 3.2 system was called Concurrent DOS. However, the sources I found a while back indicate that at least for a short period of time, BDOS 3.1 systems with PC-MODE were already called Concurrent DOS as well, at least after a certain date. So, yes, Concurrent CP/M-86 3.1 plus PC-MODE is the same product as Concurrent DOS 3.1 minus a few minor improvements/fixes (probably). There are no variants of Concurrent DOS without PC-MODE, and PC-MODE is also included in DOS Plus, DR DOS, and Multiuser DOS, of course. However, the API emulator was still an optional module - it wasn't included, for example, in Personal CP/M-86. --Matthiaspaul (talk) 21:29, 19 April 2013 (UTC)

XVCPI support in Concurrent DOS 386[edit]

Does someone have any information (announcements, documentation, or other bits) in regard to XVCPI (Extended Virtual Control Program Interface) support in Concurrent DOS 386 since ca. 1989? This was apparently a parallel effort to DPMI to enable the full memory management and multitasking capabilities of the 386 in which Intel, Digital Research, Interactive Systems and other parties seem to have played a role. Very little is known about this, so if you know anything about it, your comments or contributions to the VCPI article or talk page would be highly welcome. Thanks. --Matthiaspaul (talk) 12:02, 28 May 2013 (UTC)