Bcd Commands ~repack~ Official

; Add two 4-digit packed BCD numbers (result in DX:AX) ; Input: BCD1 = 0x1234 in DX, BCD2 = 0x5678 in BX ; Output: sum = 0x6912 (1234+5678=6912)

The bcdedit command-line tool is used to manage the BCD store, which contains boot configuration parameters. If you are dual-booting or troubleshooting a "missing operating system" error, these are the essential commands. bcd commands

: Displays every entry in the store, including firmware and legacy settings. ; Add two 4-digit packed BCD numbers (result

mov al, 0x45 ; BCD 45 add al, 0x27 ; BCD 27 → binary result 0x6C daa ; adjusts to 0x72 (BCD 72) Input: BCD1 = 0x1234 in DX