I was reading the etymology for 'come (v.)' when I encountered:
[...] The substitution of Middle English -o- for Old English -u- before -m-, -n-, or -r- was a scribal habit before minims to avoid misreading the letters in the old style handwriting, which jammed letters. The practice similarly transformed some, monk, tongue, worm. Modern past tense form came is Middle English, probably from Old Norse kvam, replacing Old English cuom. [...]
Are there any illustrations or depictions of texts, to help me visualise and discern how this problem of misreading caused this morphological substitution (from -u- to -o-)? I Googled to no avail.