Ophis 2.2: 28 Jul 2024
 - Codebase updated to Python 3: new minimum version is 3.6
 - New delivery option: pip and pipx (ophis-asm project). Older
   ad-hoc standalone script delivery options have been retired.
 - All instructions with Absolute modes may force them with a .W
   suffix to the instruction
 - New example code for Atari 2600, Atari 800, and Apple II
 - Bugfix: charmap now applies to every string in a data directive
 - Bugfix: ASR instructions on the 4502 now properly emit Zero Page
           addressing modes when possible
 - Bugfix: original Atari 2600 example program now runs properly on a
           Harmony cartridge

Ophis 2.1: 24 May 2014
 - Listfile support: passing "-l <filename>" will produce a human-
   readable version of the generated binary, annotated with addresses
   and disassemblies where appropriate
 - Mapfile support: passing "-m <filename>" will produce a map from
   raw addresses in the binary to locations in the code where that
   address was defined
 - Success or failure is now reflected in the process exit code
 - Additional platform headers for the VIC-20
 - Platform headers for interacting with C64 BASIC's floating-point
   libraries
 - Support for the 4502 chip
 - Bugfix: BBXn instructions on the 6502 are now correctly emitted
 - Bugfix: The startup stub code for the C64 now properly handles
           cases where the BASIC program is overwritten during
           program run

Ophis 2.0: 16 Jun 2012
 - Codebase updated: new minimum version is Python 2.3
 - New delivery option: Windows EXE with installer
 - The .include directive now computes relative paths relative to the
   source file rather than the CWD
 - The .incbin directive now accepts start/length arguments to include
   only parts of a binary file
 - New directives: .advance, .outfile
 - Directives deprecated in 1.0 release removed: .address, .ascii,
   .code, .link, and .segment. These are replicated by .byte, .word,
   .text, and .org/.include pairs.
 - The file "-" may be passed as input or output to represent stdin
   and stdout
 - Out-of-bounds branches will be translated into legal code with a
   warning
 - Instructions with both Zero Page and Absolute modes may force
   Absolute by appending ".W" to the instruction
 - Sample code, platform headers, and test suite

Ophis 1.0:  3 Oct 2007
 - New directives: .charmap, .charmapbin
 - Support for the 65c02 chip

Ophis 0.7.2: 17 Jul 2003
 - Bugfix: indexed LSR instructions parsed incorrectly

Ophis 0.7.1: 10 Jul 2003
 - Bugfix: Macros without arguments now work properly

Ophis 0.7: 1 Jan 2003
 - Codebase updated: new minimum version is 2.1
 - New directives: .macro, .macend, .invoke, .require
 - Standalone script instead of invoking Ophis.Main directly
 - Circularity check for labels

Ophis 0.2: 28 Nov 2002
 - New directives: .wordbe, .dwordbe, .scope, .scend

Ophis 0.1: 15 Aug 2002
 - First public release