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====
a8xd
====
----------------------------------
Atari 8-bit ATASCII-aware hex dump
----------------------------------
.. include:: manhdr.rst
SYNOPSIS
========
*a8xd* [**-i**] [**-l** *limit*] [**-m**] [**-o** offset] [**-s** *[-]seek*] [**-u**] [**-v**] [*infile*]
DESCRIPTION
===========
**a8xd** is a hex dump utility, similar to **xxd**\(1), but it
understands and prints ATASCII characters rather than ASCII.
The ATASCII codes are converted to UTF-8, in the same way as
**a8cat**\(1). Codes with the high bit set are displayed in inverse
video, using ANSI/VT-100 escape sequences.
By default, the output is colorized (see **COLORS**, below). The
colors and inverse rendering apply to both the ATASCII and hex bytes.
Without *infile*, or if *infile* is **-**, **a8xd** reads from standard input.
OPTIONS
=======
-a
ANTIC mode: treat the input as screen bytes (aka "internal codes")
rather than ATASCII. Can usefully be combined with **-g** or **-f**.
-f
Like **-g**, but using the top half of the character set. This is
what you'd see on the Atari with *GRAPHICS 1:POKE 756,226*.
-g
Graphics mode. Changes the printed characters and colorization so it
looks like *GRAPHICS 1* (or 2) on the Atari.
-i
Print XL/XE International Character Set conversions instead of ATASCII.
-l *len*
Stop after dumping *len* bytes. *len* may be given in decimal or hex (with
leading *0x* or *$*).
-m
Monochrome mode. Disables color, but ATASCII characters with the high bit
set are still displayed in inverse.
-o *offset*
Add *offset* to displayed file position. *offset* can be given in decimal
or hex (with leading *0x* or *$*). Negative offsets are allowed, but they
will be printed as very large positive numbers in the output (this matches
**xxd**\'s behaviour).
-s *[-]seek*
Start at *seek* bytes. Without *-*, this is an absolute offset. With *-*,
it's relative to the end of the file. The *-* option won't work when
reading from standard input. *seek* may be given in decimal or hex
(with leading *0x* or *$*).
-u
Use uppercase letters for hex digits; the default is lowercase.
-v
Verbose. Shows various debug messages that are probably only useful
if you're hacking on **a8xd**.
**--**
End of options; the next argument is the filename. Use this if you're
trying to work with files whose names begin with *-*.
**-h**, **--help**
Show built-in help and exit.
**--version**
Show version number and exit.
COLORS
======
The default color scheme is:
- Non-control characters are green. This includes alphanumerics, spaces, and
punctuation. These are the characters that ATASCII has in common with
ASCII.
- Graphics characters are yellow. This includes **$01** to **$1a** (the
alphabet, with the Control key held down), **$60** (the diamond), and
**$7b** (the spade).
- Codes **$00** (null, or ATASCII heart) and **$9B** (EOL) are red. These
characters are used as delimiters, so it makes sense for them to
stand out.
- Cursor control characters are purple. These are characters that perform
some action when printed to the *E:* device. These are:
**$1b**
Escape.
**$1c** through **$1f**
Cursor movement (up/down/left/right arrows).
**$7d**
Clear screen.
**$7e**
Backspace.
**$7f**
Tab.
**$9c**
Delete line.
**$9d**
Insert line.
**$9e**
Clear tab stop.
**$9f**
Set tab stop.
**$fd**
Bell.
**$fe**
Delete character.
**$ff**
Insert character.
In **-f** and **-g** modes, the above doesn't apply. Instead, the
colors are (close to) the colors that would appear in *GRAPHICS 1*,
with the default palette.
NOTES
=====
**a8xd** requires the terminal emulator to support UTF-8 and use a
font with the necessary glyphs. The author has tested extensively
with **urxvt**\(1) (aka **rxvt-unicode**) and **xterm**\(1), using
the *Deja Vu Sans Mono*, *JetBrains Mono*, *Liberation Mono*,
and *Symbola* fonts. Also **kitty**\(1), **xfce4-terminal**\(1),
KDE/Plasma 5's **konsole**\(1), **gnome-terminal**\(1) 3.43.90, and
**st**\(1) from suckless.org have been lightly tested and seem to work
fine. Even the Linux console works, except that you won't be able to
find a console font with all the necessary glyphs (I may create one
someday).
**a8xd** only supports terminals that use ANSI-style escape sequences
for color and inverse video. This isn't much of a limitation, since
all modern X, Wayland, Mac, etc terminal emulators have support for
this... but it might annoy you if you're trying to use an Atari ST
with a VT52 emulator as a serial terminal. Sorry.
**a8xd** supports a useful subset of **xxd**\(1) options. The main things
missing are:
- **-r** (revert).
- **-include** (output as C include) and all options related to it.
- **-g** (grouping; **a8xd** always uses a group size of 1 byte).
- **-E** (EBCDIC mode).
- **-p** (PostScript/continuous dump).
- **-cols** (**a8xd** only supports 16 column dumps).
- **-b** (bits mode).
- support for files larger than 2GB. This won't be a problem for Atari 8-bit-related files!
- replacing duplicate lines in the output with **\***.
.. include:: manftr.rst
|
