Close-up shot of a vintage computer circuit board featuring multiple integrated circuits and electronic components. Two DIP40 chips with label MOS6532A are prominently visible.

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   root42 (root42@chaos.social)'s status on Sunday, 26-May-2024 01:50:50 JST root42

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   There are also two MOS6532A chips, also known as RIOT or RAM IO Timer. The same chip was used in the Atari 2600. Each comes with 128 bytes of RAM. I guess these are used for controlling the floppy drives and act as working memory/buffer for the CPU‘s GCR encoding and decoding. But this is just a guess. I would have to check the schematics…