Editing JiffyDOS Kernal Upgrade (section)

== Key Features ==
* '''Fast serial protocol''' – burst-style block transfers with sector interleave control on 1541/71/81; typical 202-block load falls from 124 s → 12 s on a 1541 :contentReference[oaicite:1]{index=1}  
* '''Complete DOS Wedge''' built in – shorthand commands (`@`,`$`,`%`,`↑`,`←` etc.) for directory listing, file copy, scratch, validate, drive number change  
* '''Extra JiffyDOS-only commands''' – head-rattle suppression (`@B`), screen-to-printer dump, BASIC *UNNEW* (`@O`), disk copy, gap-size tuning  
* '''Function-key macros''' pre-loaded with useful disk operations  
* '''Bug-fixed Commodore ROMs''' – 1571 relative-file and autoboot fixes, 1541 buffer-overflow patch, 1581 improved *VALIDATE*  
* '''Hardware toggle''' – completely disables JiffyDOS for maximum compatibility, unlike cartridge fast-loaders that can only be soft-disabled  
* '''No extra cabling''' – uses the standard six-wire IEC serial bus; works in parallel with cartridges, REUs, user-port devices, RAMLink, etc.