sub IsDigit(ch: uint8): (ret: uint8) is
# A=ch
@asm "jp __IsDigit";
end sub;

sub ToLower(c: uint8): (cc: uint8) is
# A=ch
@asm "jp __ToLower";
end sub;

sub CopyString(src: [uint8], dest: [uint8]) is
# HL=src
@asm "ld de,(", dest, ")"; # DE=dest
@asm "jp __CopyString";
end sub;

sub StrCmp(s1: [uint8], s2: [uint8]): (res: int8) is
# HL=s1
@asm "ld de,(", s2, ")"; # DE=s2
@asm "jp __StrCmp";
end sub;

sub StrICmp(s1: [uint8], s2: [uint8]): (res: int8) is
# HL=s1
@asm "ld de,(", s2, ")"; # DE=s2
@asm "jp __StrICmp";
end sub;

sub StrLen(s: [uint8]): (size: uint16) is
# HL = s
@asm "jp __StrLen";
end sub;