I played a lot in the early 1990s, and 50 escudos (0.25 euros without inflation) was worth 1 credit, if my memory serves me correctly. 100 escudos (0.5 euros) was worth 3 credits. 50 escudos at that time could buy 2 pastries. Now, each pastry costs more than 1 euro.
Man you have a good memory. I can't even remember what I had for breakfast this morning. Lol.