Update README-RealC64.md
Update README-RealC64.md

added Strikelink modem, C128, 1541-U
TheCarlSaganExpress/neohabitat,frandallfarmer/neohabitat,TheCarlSaganExpress/neohabitat,TheCarlSaganExpress/neohabitat,ssalevan/neohabitat,frandallfarmer/neohabitat,frandallfarmer/neohabitat,frandallfarmer/neohabitat,frandallfarmer/neohabitat,ssalevan/neohabitat,TheCarlSaganExpress/neohabitat,frandallfarmer/neohabitat,TheCarlSaganExpress/neohabitat,ssalevan/neohabitat,ssalevan/neohabitat,ssalevan/neohabitat,TheCarlSaganExpress/neohabitat,ssalevan/neohabitat