; ============================================================================ ; INT 12h - STRING SERVICES ; A library of string functions intended to support programming in assembly, ; or to be used by a higher level language implemented in assembly. ; February 7th, 2026, 10:20AM -- passed all 85 tests on the SD-8516 ; ============================================================================ ; Function dispatch via AH register: ; AH=00h: strlen - Get string length ; AH=01h: strcpy - Copy string ; AH=02h: strcmp - Compare strings ; AH=03h: strcat - Concatenate strings ; AH=04h: atoi - ASCII to integer ; AH=05h: itoa - Integer to ASCII ; AH=06h: strupr - Convert to uppercase ; AH=07h: strlwr - Convert to lowercase ; AH=08h: strchr - Find character in string ; AH=09h: strncpy - Copy n characters ; AH=0Ah: strncmp - Compare n characters ; AH=0Bh: strcmpi - Compare strings (case-insensitive) ; AH=0Ch: conv_ch_to_uc - Convert single char to uppercase ; AH=0Dh: conv_ch_to_lc - Convert single char to lowercase ; AH=0Eh: test_uc_lc - Test if char is uppercase ; AH=0Fh: isnum - Test if char is digit (0-9) ; AH=10h: isalpha - Test if char is letter (A-Z, a-z) ; AH=11h: puthex - Print byte in AL as hex ; AH=12h: putbase - Print number in B in base CL ; AH=13h: print_fld_hex ; ============================================================================