A collection of screens that have (mostly) not been found and may be worth putting on one page for Google to see
This is mostly helpful for if the BA thread for Bootscreens Collection finds is ever made, because then we can have the important/interesting ones on one page
Bootscreens Collection Discord server
Related: screens that aren't as interesting but have not been found
Windows 1.02 (RM Nimbus PC-286 OEM)
Found in a thread on Vintage Computer Federation Forums about the Nimbus PC-286. TBA.
Windows 1.02 (Siemens PCD-2 OEM, alt)
Found in the 86Box Discord server. Supposedly, this is caused by some bug.
Windows 1.03 (ICL OEM, ENGA)
Found in CNDRHI30.LGO and ENGA.LGO in the ICL OEM of Windows 1.03. As suggested by the latter LGO name, this is related to ENGA, a slightly different version of EGA that added a line at the bottom of the display for multitasking (you can read more about that here). This was recreated from said LGOs, which had the entire screen in the same format that the MS logo uses in retail versions.
Edit: it may be worth noting that this is inverted from the LGO also, and I have no idea what colors this actually uses
Windows 1.03 (RM Nimbus PC-186(?) OEM)
Found in an article about The National Museum of Computing and Centre for Computing History. It might be 186, it might be 286, we're not sure. The image clearly says 186 but this logo is also seen in the above 286 screen. To my knowledge, 186 BIOS v1.40D has this logo (source), and the logo is apparently loaded from BIOS (source), so it could be 186.
Windows 1.04 (Zenith OEM)
Found in the BetaWiki Discord server. TBA.
Windows 2.00 Beta Release (remake by me, bluecomb)
Found in the LGO of Windows 2.03 RM Nimbus OEM (this BetaArchive thread mentions it). Appears to be later than Beta 1, as this only says "1987" rather than "1985, 1986, 1987".
Windows 2.11 (Epson OEM, PC-9800)
Found in a tweet about the same thing. Supposedly the first Epson version of Windows. I can't find any info about it either.
Windows/286 2.11 (Olivetti OEM)
Found in a Spanish listing for the Olivetti ETV 4000 S. Previously, only one Olivetti OEM of Windows was known to exist (1.03).
Windows 3.0 (Tulip OEM, English, alternate Windows line)
Found in the 86Box Discord server. TBA.
Windows 3.1 (AST OEM, Advantage! 8090p and Bravo, respectively)
TBA.
Windows NT 3.1 (TBird Drive)
Found in the December 1992 issue of the PC Games magazine (Germany) (can be seen here). Appears to be a beta, judging from a visible debug line (black text at the very top) and the PRD style. Notably, rather than the Stencil-font text over the version line, there are instead 2 lines of red text that, one above the version line, and the other below. They appear to use the same or similar font to the version line.
Edit: upon further inspection, the debug line appears to say either "Preliminary Release for Developers" or something close. My guess is that this is a German version of build 297 (or, if not 297, whichever build is German release of PRD).
Edit 2024-09-15: I figured out ~2 months ago that the 2 lines around Version 3.1 probably say "Prelimiary Release" and "With HCTs for OEMs" respectively, and forgot to update this page to add that
Windows 95 (Unknown beta, seemingly April Test-related)
Found on this page about the Windows 95 debut (archived video, can be seen around 3:43). Something I noticed is that the cloud arrangements are slightly different around where the "April Test Release" text would be.
Windows NT 4.0 (MTA Vending Machines)
There are both CTS AVM and CTS MEM versions. Below is the latter. TBA. Source
Windows 98 (TriGem OEM, alt)
TBA. Source (from what I'm seeing in inspect element, I guess this was just the thumbnail for it?)
Windows Vista (HP Daystarter)
TBA. Source
The 2 below are other (probably earlier, maybe beta?) versions of the screen, as seen in some documentation photos also on the source site