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-@c Copyright 2011 Free Software Foundation, Inc.
-@c This is part of the GAS manual.
-@c For copying conditions, see the file as.texinfo.
-
-@ifset GENERIC
-@page
-@node Z80-Dependent
-@chapter Z80 Dependent Features
-@end ifset
-
-
-@ifclear GENERIC
-@node Machine Dependencies
-@chapter Z80 Dependent Features
-@end ifclear
-
-@cindex Z80 support
-@menu
-* Z80 Options::              Options
-* Z80 Syntax::               Syntax
-* Z80 Floating Point::       Floating Point
-* Z80 Directives::           Z80 Machine Directives
-* Z80 Opcodes::              Opcodes
-@end menu
-
-@node Z80 Options
-@section Options
-@cindex Z80 options
-@cindex options for Z80
-The Zilog Z80 and Ascii R800 version of @code{@value{AS}} have a few machine
-dependent options.
-@table @option
-@cindex @code{-z80} command line option, Z80
-@item -z80
-Produce code for the Z80 processor. There are additional options to
-request warnings and error messages for undocumented instructions.
-@item  -ignore-undocumented-instructions
-@itemx -Wnud
-Silently assemble undocumented Z80-instructions that have been adopted
-as documented R800-instructions.
-@item  -ignore-unportable-instructions
-@itemx -Wnup
-Silently assemble all undocumented Z80-instructions.
-@item  -warn-undocumented-instructions
-@itemx -Wud
-Issue warnings for undocumented Z80-instructions that work on R800, do
-not assemble other undocumented instructions without warning.
-@item  -warn-unportable-instructions
-@itemx -Wup
-Issue warnings for other undocumented Z80-instructions, do not treat any
-undocumented instructions as errors.
-@item  -forbid-undocumented-instructions
-@itemx -Fud
-Treat all undocumented z80-instructions as errors.
-@item  -forbid-unportable-instructions
-@itemx -Fup
-Treat undocumented z80-instructions that do not work on R800 as errors.
-
-@cindex @code{-r800} command line option, Z80
-@item -r800
-Produce code for the R800 processor. The assembler does not support
-undocumented instructions for the R800.
-In line with common practice, @code{@value{AS}} uses Z80 instruction names
-for the R800 processor, as far as they exist.
-@end table
-
-@cindex Z80 Syntax
-@node Z80 Syntax
-@section Syntax
-The assembler syntax closely follows the 'Z80 family CPU User Manual' by
-Zilog.
-In expressions a single @samp{=} may be used as ``is equal to''
-comparison operator.
-
-Suffices can be used to indicate the radix of integer constants;
-@samp{H} or @samp{h} for hexadecimal, @samp{D} or @samp{d} for decimal,
-@samp{Q}, @samp{O}, @samp{q} or @samp{o} for octal, and @samp{B} for
-binary.
-
-The suffix @samp{b} denotes a backreference to local label.
-
-@menu
-* Z80-Chars::                Special Characters
-* Z80-Regs::                 Register Names
-* Z80-Case::                 Case Sensitivity
-@end menu
-
-@node Z80-Chars
-@subsection Special Characters
-
-@cindex line comment character, Z80
-@cindex Z80 line comment character
-The semicolon @samp{;} is the line comment character;
-
-If a @samp{#} appears as the first character of a line then the whole
-line is treated as a comment, but in this case the line could also be
-a logical line number directive (@pxref{Comments}) or a preprocessor
-control command (@pxref{Preprocessing}).
-
-@cindex line separator, Z80
-@cindex statement separator, Z80
-@cindex Z80 line separator
-The Z80 assembler does not support a line separator character.
-
-@cindex location counter, Z80
-@cindex hexadecimal prefix, Z80
-@cindex Z80 $
-The dollar sign @samp{$} can be used as a prefix for hexadecimal numbers
-and as a symbol denoting the current location counter.
-
-@cindex character escapes, Z80
-@cindex Z80, \
-A backslash @samp{\} is an ordinary character for the Z80 assembler.
-
-@cindex character constant, Z80
-@cindex single quote, Z80
-@cindex Z80 '
-The single quote @samp{'} must be followed by a closing quote. If there
-is one character in between, it is a character constant, otherwise it is
-a string constant.
-
-@node Z80-Regs
-@subsection Register Names
-@cindex Z80 registers
-@cindex register names, Z80
-
-The registers are referred to with the letters assigned to them by
-Zilog. In addition @command{@value{AS}} recognizes @samp{ixl} and
-@samp{ixh} as the least and most significant octet in @samp{ix}, and
-similarly @samp{iyl} and  @samp{iyh} as parts of @samp{iy}.
-
-@c The @samp{'} in @samp{ex af,af'} may be omitted.
-
-@node Z80-Case
-@subsection Case Sensitivity
-@cindex Z80, case sensitivity
-@cindex case sensitivity, Z80
-
-Upper and lower case are equivalent in register names, opcodes,
-condition codes  and assembler directives.
-The case of letters is significant in labels and symbol names. The case
-is also important to distinguish the suffix @samp{b} for a backward reference
-to a local label from the suffix @samp{B} for a number in binary notation.
-
-@node Z80 Floating Point
-@section Floating Point
-@cindex floating point, Z80
-@cindex Z80 floating point
-Floating-point numbers are not supported.
-
-@node Z80 Directives
-@section Z80 Assembler Directives
-
-@command{@value{AS}} for the Z80 supports some additional directives for
-compatibility with other assemblers.
-
-@cindex Z80-only directives
-These are the additional directives in @code{@value{AS}} for the Z80:
-
-@table @code
-@item db @var{expression}|@var{string}[,@var{expression}|@var{string}...]
-@itemx defb @var{expression}|@var{string}[,@var{expression}|@var{string}...]
-For each @var{string} the characters are copied to the object file, for
-each other @var{expression} the value is stored in one byte.
-A warning is issued in case of an overflow.
-
-@item dw @var{expression}[,@var{expression}...]
-@itemx defw @var{expression}[,@var{expression}...]
-For each @var{expression} the value is stored in two bytes, ignoring
-overflow.
-
-@item d24 @var{expression}[,@var{expression}...]
-@itemx def24 @var{expression}[,@var{expression}...]
-For each @var{expression} the value is stored in three bytes, ignoring
-overflow.
-
-@item d32 @var{expression}[,@var{expression}...]
-@itemx def32 @var{expression}[,@var{expression}...]
-For each @var{expression} the value is stored in four bytes, ignoring
-overflow.
-
-@item ds @var{count}[, @var{value}]
-@itemx defs @var{count}[, @var{value}]
-@c Synonyms for @code{ds.b},
-@c which should have been described elsewhere
-Fill @var{count} bytes in the object file with @var{value}, if
-@var{value} is omitted it defaults to zero.
-
-@item @var{symbol} equ @var{expression}
-@itemx @var{symbol} defl @var{expression}
-These directives set the value of @var{symbol} to @var{expression}. If
-@code{equ} is used, it is an error if @var{symbol} is already defined.
-Symbols defined with @code{equ} are not protected from redefinition.
-
-@item set
-This is a normal instruction on Z80, and not an assembler directive.
-
-@item psect @var{name}
-A synonym for @xref{Section}, no second argument should be given.
-@ignore
-
-The following attributes will possibly be recognized in the future
-@table @code
-@item abs
-The section is to be absolute. @code{@value{AS}} will issue an error
-message because it can not produce an absolute section.
-@item global
-The section is to be concatenated with other sections of the same name
-by the linker, this is the default.
-@item local
-The section is not global. @code{@value{AS}} will issue a warning if
-object file format is not soff.
-@item ovrld
-The section is to be overlapped with other sections of the same name by
-the linker. @code{@value{AS}} will issue an error message
-because it can not mark a section as such.
-@item pure
-The section is marked as read only.
-@end table
-@end ignore
-
-@end table
-
-@node Z80 Opcodes
-@section Opcodes
-In line with common practice, Z80 mnemonics are used for both the Z80 and
-the R800.
-
-In many instructions it is possible to use one of the half index
-registers (@samp{ixl},@samp{ixh},@samp{iyl},@samp{iyh}) in stead of an
-8-bit general purpose register. This yields instructions that are
-documented on the R800 and undocumented on the Z80.
-Similarly @code{in f,(c)} is documented on the R800 and undocumented on
-the Z80.
-
-The assembler also supports the following undocumented Z80-instructions,
-that have not been adopted in the R800 instruction set:
-@table @code
-@item out (c),0
-Sends zero to the port pointed to by register c.
-
-@item sli @var{m}
-Equivalent to @code{@var{m} = (@var{m}<<1)+1}, the operand @var{m} can
-be any operand that is valid for @samp{sla}. One can use @samp{sll} as a
-synonym for @samp{sli}.
-
-@item @var{op} (ix+@var{d}), @var{r}
-This is equivalent to
-
-@example
-ld @var{r}, (ix+@var{d})
-@var{opc} @var{r}
-ld (ix+@var{d}), @var{r}
-@end example
-
-The operation @samp{@var{opc}} may be any of @samp{res @var{b},},
-@samp{set @var{b},}, @samp{rl}, @samp{rlc}, @samp{rr}, @samp{rrc},
-@samp{sla}, @samp{sli}, @samp{sra} and @samp{srl}, and the register
-@samp{@var{r}} may be any of @samp{a}, @samp{b}, @samp{c}, @samp{d},
-@samp{e}, @samp{h} and @samp{l}.
-
-@item @var{opc} (iy+@var{d}), @var{r}
-As above, but with @samp{iy} instead of @samp{ix}.
-@end table
-
-The web site at @uref{http://www.z80.info} is a good starting place to
-find more information on programming the Z80.
-