Assembly language source code generally permits the use of ELF . The Interactive Disassembler allows the human user to make up mnemonic symbols for values or regions of code in an interactive session : human insight applied to the disassembly process often parallels human creativity in the code writing process.
32.
Companies and individual users could connect in to the network, via a PSS ( Packet Switch Stream ) modem, or an X . 25 PAD ( Packet Assembler / Disassembler ), and a dedicated PSS line, and use it to connect to a variety of online databases and mainframe systems.
33.
Companies and individual users could also connect into the PSS network using a basic non-error correcting RS232 / V . 24 asynchronous character based interface via an X . 3 / X . 28 / X . 29 PAD ( Packet Assembler / Disassembler ) service oriented to the then prevalent dumb terminal market place.
34.
Some software providers also produced compilers for BASIC, and other languages, to produce binary ( or " machine " ) code which would run many times faster and make better use of the small system RAM . Towards the end of its life, Dragon Data produced an assembler / disassembler / editor suite called " Dream ".
35.
Except for improved graphics and disk-booting support in the ROM, and the removal of the 2k 6502 assembler / disassembler to make room for the floating point BASIC, the II + was otherwise identical to the original II . RAM prices fell during 1980 81 and all II + machines came from the factory with a full 48k of memory already installed.
36.
In reverse engineering a product, Wharton said, one goes through the same steps in opposite order : The engineer removes the program bits from the chip's memory, uses a disassembler to convert them back into the program source code, analyzes that source code to figure out what the functions were and what they did, and examines the electronic circuitry to understand how various signals are used.
37.
Closely related to the X . 25 protocol are the protocols to connect asynchronous devices ( such as dumb terminals and printers ) to an X . 25 network : X . 3, X . 28 and X . 29 . This functionality was performed using a Packet Assembler / Disassembler or PAD ( also known as a " Triple-X device ", referring to the three protocols used ).
38.
Stella includes many facilities for homebrew developers, including an extensive built-in interactive debugger and disassembler supporting breakpoints, read / write traps, etc . Other major features include Blargg TV effects, a cheatcode system, support for user-defined palette files, state loading / saving, hardware-accelerated rendering and effects, event remapping, and an extensive built-in, cross-platform user interface ( including a ROM launcher frontend ).
39.
Because the compiler itself was a compiled program, users would be extremely unlikely to notice the machine code instructions that performed these tasks . ( Because of the second task, the compiler's source code would appear " clean " . ) What's worse, in Thompson's proof of concept implementation, the subverted compiler also subverted the analysis program ( the disassembler ), so that anyone who examined the binaries in the usual way would not actually see the real code that was running, but something else instead.
