Print_Str_d ($F37A)

This routine prints a single string (up to an 0x80), using the default height and width, as stored in $C82A, and at the pen position specified in the D register. The parameter block describing the string is pointed to by the U register. The format for the parameter block is as follows:

string, 0x80

ENTRY:

DP = $D0

U-reg points to string list

A-reg = relative Y position

B-reg = relative X position

EXIT:

U-reg points to the byte after the terminating 0x80

D-reg, X-reg trashed

Source