Because before 1987, most "DOS" machines were IBM Personal Computers(8088), XT's(8088), PCjr's(8088), AT's(286), or at the ass end of the 80's a PS/2 with a 386 on the high end. Even the Total DOS Collection only goes back to 1981, and there was less than 20 titles released that year. Most videogames on computers prior to 1987 were on Amiga, TRS-80, CP/M, or fucking mainframes. Still, there was some good games from 1981-1987 that do get ignored, since most people just focus on the popular titles from the era like the Zork series, Rogue, Ultima series, Kings Quest series, Wizardry series, etc.
I entirely support anyone willing to emulate all DOS releases from 1987 going back and make images like you've posted. A "complete" history of DOS gaming would be awesome. And companion images for complete Amiga and other retro PC gaming would be great too.
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