HP Calculator S/N Decoder

Pre-1996 models only. The format of their serial numbers is:

YYWWCNNNNN

where:

• YY is the year number
• WW is the week number
• C is the country code
• NNNNN is the manufacture number

Usage

Enter the first 4 digits of a serial number (YYWW):

• f 6
• 2422 R/S

Registers

R0, R1, R2, R3, R4, R5

Pre-defined Registers

• 01.011960 STO 0
• 1 EEX 6 CHS STO 1
• 100 STO 2

Keystrokes

• 01– STO 3
• 02– RCL 2
• 03– ÷
• 04– g INTG
• 05– STO 4
• 06– RCL 2
• 07– ×
• 08– RCL 3
• 09– x<>y
• 10– -
• 11– STO 5
• 12– RCL 4
• 13– RCL 1
• 14– ×
• 15– RCL 0
• 16– +
• 17– RCL 5
• 18– 7
• 19– ×
• 20– g DATE