I don't see the classic X-COM games listed in the spreadsheet. I can't edit the sheet directly because I'm at work and we have some weird blocks in place, but here's my rating of the first 2 X-COM games as I have them on Steam:
X-COM1: UFO Defense
developer/publisher: Mythos / MicroProse
year: 1994
platform: Steam
packaged: DOSbox mounts folder
install: copy folder
recommended machine: I only played this on 486&pentium class computers; may be compatible with older but don't know
memory: don't remember; I only played this on machines with 16MB or more
compat problems: ? don't think there are any; AFAIK the released files are identical to the original game files
X-COM2: Terror From The Deep
developer/publisher: Mythos / MicroProse
year: 1995
platform: Steam
packaged: DOSbox mounts folder
install: copy folder
recommended machine: I only played this on 486&pentium class computers; may be compatible with older but don't know
memory: don't remember; I only played this on machines with 16MB or more
compat problems: ? don't think there are any; AFAIK the released files are identical to the original game files
Ufopaedia says this regarding requirements:
X-COM 1
Minimum
386 processor
4MB RAM
Hard drive (10MB free, game alone)
MS-DOS 5.0 or higher
VGA Graphics
Recommended
486 or better
8MB RAM
Hard drive (15MB free, game + manual)
SVGA Graphics
Sound Cards Supported
PC Internal speaker
AdLib compatible cards
Sound Blaster compatible cards
Roland LAPC-1
https://www.ufopaedia.org/index.php/Info
X-COM 2
Minimum
386 (33MHz minimum)
4MB RAM
Hard drive (60MB free, game alone)
MS-DOS 5.0 or higher
VGA Graphics
Microsoft Mouse driver v8.01 or higher
Recommended
486 (50MHz) or better
8MB RAM
Hard drive (63MB free, game + manuals)
SVGA Graphics
https://www.ufopaedia.org/index.php/Info_(TFTD)
I/O, I/O,
It's off to disk I go,
With a bit and a byte
And a read and a write,
I/O, I/O