If you do not know the number of pages, start with a ROM size of 2048 bytes and by trial and error decrease (multiples of 256 byte pages) until you do not see errors and the size makes sense. The size of the code is not always fixed at 2048 bytes. A program may be stored as a variable number of 256 byte pages.You have to isolate and extract each program individually. Several programs may be stored sequentially in the WAV file.The last byte is probably correct despite the parity error. I noticed some tapes only have 2047 bytes stored, so the 2048th byte is sometimes interpreted as garbage (manifested as a parity error, depending on how the trailing audio is trimmed.In Audacity to save a signed 8-bit PCM raw file, you have to export your selection.Use File->Export->Export As WAV, then change 'save as type' to 'other uncompressed files'.Pick raw (headerless) and signed 8-bit PCM data. Make sure the project sampling rate is set to 96000 Hz (bottom left corner of Audacity window)when exporting a raw PCM data files. You should now see your audio file at the location specified! I checked the sound quality between the video and the audio file and they were exactly the same, so you’re not going to lose any quality in the extraction process. The program is pretty fast, it took only 1 minute to extract audio from a 19 minute video clip. Now, go ahead and click Start and the extraction process will begin. Before clicking Start, click on Browse and choose the location for the output MP3 file. Select a video and click on Movie Clip if you want to extract audio from a specific time segment in the video. You can change the output format under the Output Options section below the main list. The videos will show up in the main window along with basic information such as the Start, End, Source Format, and Output Format. You can add more files if you want and they will be processed in a batch. Open the program and click the Add Files button to select the video files. To get started using AoA Audio Extractor, download and install the program.
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December 2022
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