If your query regarding "hot" refers to hardware temperature:
Even web-based emulators (e.g., or 64jim ) are adding "Drag-and-drop .BIN hot patching." jiffydosc64bin hot
The Ultimate Guide to JiffyDOS: Speeding Up Your Commodore 64 If your query regarding "hot" refers to hardware
: Function keys are pre-programmed for common tasks like loading and running programs (F3) or changing directories (F5). Working with JiffyDOS Binary Files jiffydosc64bin hot
**** COMMODORE 64 BASIC V2 **** 64K RAM SYSTEM JIFFYDOS V1.5 READY.
JiffyDOS is a replacement Kernal ROM for the Commodore 64 and its disk drives that drastically increases serial bus speeds and adds convenient shortcut commands The "jiffydos_c64.bin" file specifically refers to the 8KB Kernal ROM image