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Marko Mäkelä wrote the C2N232 firmware in machine language. All utility software has been written in portable C for POSIX® compliant (Unix-like) systems, Microsoft Windows and Commodore AmigaOS.
The program loads an automatically starting fastloader that loads
and starts the specified program by RUN or
SYS statement. Version 1.0.2 fixes a bug in the cassette
port #2 of the universal PET loader. Version 1.0.3 can avoid starting the program,
and it is able to load to the memory area
$d000..$dfff on the Commodore 64 and
Commodore 128. Version 1.0.4 features a progress indicator on other
systems than Commodore AmigaOS. Version 1.0.5 works better with USB-based
RS-232 adapters (tested with two adapters based on the Prolific PL-2303).
The program can transfer some low-level tape images
(.tap). Due to the slow transfer rate, high frequencies
cannot be repeated. Some noise can be reduced by the separate
tapcleaner utility.