We can find those Lenten regulations in the 1917 Code of Canon Law.
Abstinence from meat was practiced on all Fridays throughout the year (canon 1252 § 1).
Ash Wednesday and all Fridays & Saturdays of Lent were fast days in addition to days of abstinence (canon 1252 § 2).
All the days of Lent, excluding Sundays, were considered days of fasting (canon 1252 § 3, 1252 § 4).
Fasting was considered to be only one full meal with a small amount of food in the morning and evening (canon 1051) and the Lenten regulations ceased at noon on Holy Saturday (canon 1252 § 4).