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.TH "A8XD" 1 "2024-07-02" "0.2.1" "Urchlay's Atari 8-bit Tools"
.SH NAME
a8xd \- Atari 8-bit ATASCII-aware hex dump
.SH SYNOPSIS
.sp
\fIa8xd\fP [\fB\-i\fP] [\fB\-l\fP \fIlimit\fP] [\fB\-m\fP] [\fB\-o\fP offset] [\fB\-s\fP \fI[\-]seek\fP] [\fB\-u\fP] [\fB\-v\fP] [\fIinfile\fP]
.SH DESCRIPTION
.sp
\fBa8xd\fP is a hex dump utility, similar to \fBxxd\fP(1), but it
understands and prints ATASCII characters rather than ASCII.
.sp
The ATASCII codes are converted to UTF\-8, in the same way as
\fBa8cat\fP(1). Codes with the high bit set are displayed in inverse
video, using ANSI/VT\-100 escape sequences.
.sp
By default, the output is colorized (see \fBCOLORS\fP, below). The
colors and inverse rendering apply to both the ATASCII and hex bytes.
.sp
Without \fIinfile\fP, or if \fIinfile\fP is \fB\-\fP, \fBa8xd\fP reads from standard input.
.SH OPTIONS
.INDENT 0.0
.TP
.B  \-a
ANTIC mode: treat the input as screen bytes (aka "internal codes")
rather than ATASCII. Can usefully be combined with \fB\-g\fP or \fB\-f\fP\&.
.TP
.B  \-f
Like \fB\-g\fP, but using the top half of the character set. This is
what you\(aqd see on the Atari with \fIGRAPHICS 1:POKE 756,226\fP\&.
.TP
.B  \-g
Graphics mode. Changes the printed characters and colorization so it
looks like \fIGRAPHICS 1\fP (or 2) on the Atari.
.TP
.B  \-i
Print XL/XE International Character Set conversions instead of ATASCII.
.UNINDENT
.INDENT 0.0
.TP
.B \-l \fIlen\fP
Stop after dumping \fIlen\fP bytes. \fIlen\fP may be given in decimal or hex (with
leading \fI0x\fP or \fI$\fP).
.UNINDENT
.INDENT 0.0
.TP
.B  \-m
Monochrome mode. Disables color, but ATASCII characters with the high bit
set are still displayed in inverse.
.UNINDENT
.INDENT 0.0
.TP
.B \-o \fIoffset\fP
Add \fIoffset\fP to displayed file position. \fIoffset\fP can be given in decimal
or hex (with leading \fI0x\fP or \fI$\fP). Negative offsets are allowed, but they
will be printed as very large positive numbers in the output (this matches
\fBxxd\fP\(aqs behaviour).
.TP
.B \-s \fI[\-]seek\fP
Start at \fIseek\fP bytes. Without \fI\-\fP, this is an absolute offset. With \fI\-\fP,
it\(aqs relative to the end of the file. The \fI\-\fP option won\(aqt work when
reading from standard input. \fIseek\fP may be given in decimal or hex
(with leading \fI0x\fP or \fI$\fP).
.UNINDENT
.INDENT 0.0
.TP
.B  \-u
Use uppercase letters for hex digits; the default is lowercase.
.TP
.B  \-v
Verbose. Shows various debug messages that are probably only useful
if you\(aqre hacking on \fBa8xd\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B \fB\-\-\fP
End of options; the next argument is the filename. Use this if you\(aqre
trying to work with files whose names begin with \fI\-\fP\&.
.TP
.B \fB\-h\fP, \fB\-\-help\fP
Show built\-in help and exit.
.TP
.B \fB\-\-version\fP
Show version number and exit.
.UNINDENT
.SH COLORS
.sp
The default color scheme is:
.INDENT 0.0
.INDENT 3.5
.INDENT 0.0
.IP \(bu 2
Non\-control characters are green. This includes alphanumerics, spaces, and
punctuation. These are the characters that ATASCII has in common with
ASCII.
.IP \(bu 2
Graphics characters are yellow. This includes \fB$01\fP to \fB$1a\fP (the
alphabet, with the Control key held down), \fB$60\fP (the diamond), and
\fB$7b\fP (the spade).
.IP \(bu 2
Codes \fB$00\fP (null, or ATASCII heart) and \fB$9B\fP (EOL) are red. These
characters are used as delimiters, so it makes sense for them to
stand out.
.IP \(bu 2
Cursor control characters are purple. These are characters that perform
some action when printed to the \fIE:\fP device. These are:
.INDENT 2.0
.INDENT 3.5
.INDENT 0.0
.TP
.B \fB$1b\fP
Escape.
.TP
.B \fB$1c\fP through \fB$1f\fP
Cursor movement (up/down/left/right arrows).
.TP
.B \fB$7d\fP
Clear screen.
.TP
.B \fB$7e\fP
Backspace.
.TP
.B \fB$7f\fP
Tab.
.TP
.B \fB$9c\fP
Delete line.
.TP
.B \fB$9d\fP
Insert line.
.TP
.B \fB$9e\fP
Clear tab stop.
.TP
.B \fB$9f\fP
Set tab stop.
.TP
.B \fB$fd\fP
Bell.
.TP
.B \fB$fe\fP
Delete character.
.TP
.B \fB$ff\fP
Insert character.
.UNINDENT
.UNINDENT
.UNINDENT
.UNINDENT
.UNINDENT
.UNINDENT
.sp
In \fB\-f\fP and \fB\-g\fP modes, the above doesn\(aqt apply. Instead, the
colors are (close to) the colors that would appear in \fIGRAPHICS 1\fP,
with the default palette.
.SH NOTES
.sp
\fBa8xd\fP requires the terminal emulator to support UTF\-8 and use a
font with the necessary glyphs. The author has tested extensively
with \fBurxvt\fP(1) (aka \fBrxvt\-unicode\fP) and \fBxterm\fP(1), using
the \fIDeja Vu Sans Mono\fP, \fIJetBrains Mono\fP, \fILiberation Mono\fP,
and \fISymbola\fP fonts. Also \fBkitty\fP(1), \fBxfce4\-terminal\fP(1),
KDE/Plasma 5\(aqs \fBkonsole\fP(1), \fBgnome\-terminal\fP(1) 3.43.90, and
\fBst\fP(1) from suckless.org have been lightly tested and seem to work
fine. Even the Linux console works, except that you won\(aqt be able to
find a console font with all the necessary glyphs (I may create one
someday).
.sp
\fBa8xd\fP only supports terminals that use ANSI\-style escape sequences
for color and inverse video. This isn\(aqt much of a limitation, since
all modern X, Wayland, Mac, etc terminal emulators have support for
this... but it might annoy you if you\(aqre trying to use an Atari ST
with a VT52 emulator as a serial terminal. Sorry.
.sp
\fBa8xd\fP supports a useful subset of \fBxxd\fP(1) options. The main things
missing are:
.INDENT 0.0
.IP \(bu 2
\fB\-r\fP (revert).
.IP \(bu 2
\fB\-include\fP (output as C include) and all options related to it.
.IP \(bu 2
\fB\-g\fP (grouping; \fBa8xd\fP always uses a group size of 1 byte).
.IP \(bu 2
\fB\-E\fP (EBCDIC mode).
.IP \(bu 2
\fB\-p\fP (PostScript/continuous dump).
.IP \(bu 2
\fB\-cols\fP (\fBa8xd\fP only supports 16 column dumps).
.IP \(bu 2
\fB\-b\fP (bits mode).
.IP \(bu 2
support for files larger than 2GB. This won\(aqt be a problem for Atari 8\-bit\-related files!
.IP \(bu 2
replacing duplicate lines in the output with \fB*\fP\&.
.UNINDENT
.SH COPYRIGHT
.sp
WTFPL. See \fI\%http://www.wtfpl.net/txt/copying/\fP for details.
.SH AUTHOR
.INDENT 0.0
.IP B. 3
Watson <\fI\%urchlay@slackware.uk\fP>; Urchlay on irc.libera.chat \fI##atari\fP\&.
.UNINDENT
.SH SEE ALSO
.sp
\fBa8cat\fP(1),
\fBa8eol\fP(1),
\fBa8xd\fP(1),
\fBatr2xfd\fP(1),
\fBatrsize\fP(1),
\fBaxe\fP(1),
\fBblob2c\fP(1),
\fBblob2xex\fP(1),
\fBcart2xex\fP(1),
\fBcxrefbas\fP(1),
\fBdasm2atasm\fP(1),
\fBdumpbas\fP(1),
\fBf2toxex\fP(1),
\fBfenders\fP(1),
\fBlistbas\fP(1),
\fBprotbas\fP(1),
\fBrenumbas\fP(1),
\fBrom2cart\fP(1),
\fBunmac65\fP(1),
\fBunprotbas\fP(1),
\fBvxrefbas\fP(1),
\fBxex1to2\fP(1),
\fBxexamine\fP(1),
\fBxexcat\fP(1),
\fBxexsplit\fP(1),
\fBxfd2atr\fP(1),
\fBxex\fP(5),
\fBatascii\fP(7).
.sp
Any good Atari 8\-bit book: \fIDe Re Atari\fP, \fIThe Atari BASIC  Reference
Manual\fP,  the  \fIOS Users\(aq Guide\fP, \fIMapping the Atari\fP, etc.
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