sorry, checked all my interface cards, cannot find one the same as this in my collection.also all mine work from serial cable not 5v supply.
best of luck.
im almost certain that the chips are a max232 and an sn7407n but its more the components that go with them such as resistor capacitors and any diodes also if i can connect a external 5v supply
see thread season i/f (faq and mai tools) the board i have built is the cct on the left hand side in first post.
i use it in dragon cam which is inserted in humax rx +fausto s/w
. hope this is some help
ref my last post on27 aug-
using board with MAX232 chip only. Idid not connect 5v Vcc supply to iso pin on card but allowed HOST (dragon cam ) to provide it via humax 5300vaci stb