j"19HxigV4QyBv3tHpQVcUEQyq1pzZVdoAutLúTheir [CMD] first commercial product for the C64 was a KERNAL based fast loader and utility chip called JiffyDOS. It was not the first KERNAL-based enhancement for the C64 (SpeedDOS and DolphinDOS also existed), but was perhaps the best implemented.
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https://whatsonchain.com/tx/bb41079807495fe7dea4fa3d57f1bf933898c6babc37e64de9622ae77092e5ef