“ When a defendant whose indigency and desire to appeal are manifest does not have the services of his trial counsel on appeal, it simply cannot be inferred from defendant's failure specifically to request appointment of appellate counsel that he has knowingly and intelligently waived his right to the appointment of appellate counsel. ”

“ But even if such a request had not been made, we do not think its absence would amount to a waiver of respondent's rights. It is now settled 'that where the assistance of counsel is a constitutional requisite, the right to be furnished counsel does not depend on a request.' Carnley v. ”