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= INT 12h String Services

== Catalog
    ; ============================================================================
    ; 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
    ; ============================================================================