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Do you know which font is being used in the video here: https://www.youtube.com/watch?v=xnudvJbAgI0? A screengrab of the video that shows a lot of text:
We can see that the zeros are slashed, so it is probably not one of the 9x16 fonts which used to have dotted zeros.
Do you know which font set was being used in these PCs that produced slashed zeros?
The font in use appears to be the ‘9×14’ bitmap font (i.e. 8×14 glyph bitmaps tweaked for 9×14 character cells) of the Hercules graphics card. The title of the video is ‘Windows1 (1985) PC XT Hercules’; I guess that’s something of a dead giveaway. This font happens to be substantially (if not perfectly) identical to that of the original IBM MDA card.
In the ‘VGA Text Mode Fonts’ collection, glyphs from FONTS/PC-IBM/MDA9.F14, FONTS/PC-OTHER/GRMONOX9.F14, FONTS/PC-OTHER/RUMG2M9.F14, FONTS/PC-OTHER/HYUNMGR9.F14 and a few others appear to be consistent with what is seen in the recording. Those font files are not identical, so there must be some glyphs that differ by at least a few pixels, but I have not noticed a perceptible difference in the characters seen in the video.
Other than slashed zero, particularly characteristic are the shapes of the glyphs for ‘6’, ‘A’, ‘M’, ‘V’, ‘W’, ‘Y’, ‘b’, ‘f’ and ‘y’, especially the latter three: the notch in the ‘b’ glyph, the longer horizontal stroke of the ‘f’ and the shorter tail of the ‘y’ distinguish the MDA font from the EGA font.0 Below is my attempt at reconstructing the screenshot with one of those fonts:
If you open the above image in a viewer that can interpret ‘pHYs’ PNG chunks, you should be able to view it in the original 4:3 aspect ratio. Though if for whatever reason you cannot find one, here it is again with aspect correction.
The website you linked in the comments offers this font as IBM MDA, but without aspect correction. I presume this might have thrown you off, leaving you unable to recognise it.
0 The EGA font is also shifted one pixel to the left within the 9×14 character cell compared to MDA, but this is much harder to notice, if even possible. Those three glyphs pairs are the only ones to differ in shape.
According to the video's description the used graphics card is a Hercules Graphics Card. This type is as well what gets selected during installation at 2:36. Since the very same font is clearly visible during RAM check chances are good that it's the cards default font.
The card support a
In MDA compatible text mode the card uses the original IBM MDA 9x14 font, which is shown in above screen shot. The font can be seen(and tried) in detail on the MDA page on INT10h's Font List:
We can see that the zeros are slashed, so it is probably not one of the 9x16 fonts which used to have dotted zeros.
Actually, that is the key clue. Dotted vs. slashed zeros were never specific to particular font size, but rather to a type of machine. In particular, for IBM dotted zero was classic for the 3270 series of terminals. See for example this font site and this font site.
On the other hand, the IBM MDA, CGA, EGA and VGA fonts all use slashed zero, with as far as I can tell the sole exception of the VGA 9x16 font. See this fabulous site for all the details. I don't know why IBM went with the dotted zero for VGA 9x16 specifically, but except for that it was all slashed zeros.
