Casio QT 6600 Reference Manual - Page 88
Magnetic card specification
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Application System Magnetic card specification Track-1, Format B: Start sentinel - one character (generally '%') Format code = "B" - one character (alpha only) Primary account number (PAN) - up to 19 characters Usually, but not always, matches the credit card number printed on the front of the card. Field separator - one character (generally '^') Name - two to 26 characters Field separator - one character (generally '^') Expiration date - four characters in the form MMYY Service code - three characters Discretinary data - may include Pin Verification Key Indicator (PVKI, one character), Pin Verification Value (PVV, 4 characters) Card Verification Value or Card Verification Code (CVV or CVK, 3 characters) End sentinel - one character (generally '?') Longitudinal redundancy check (LRC) - one character Track-2: Start sentinel - one character (generally ':') Track number - 1, 2, 3 Primary Account Number (PAN) - up to 19 characters Usually, but not always, matches the credit card number printed on the front of the card Separator - one character (generally '=') Expiration date - four characters in the form MMYY Service code - three characters Discretionary data - as in track one End sentinel - one character (generally '?') LRC - one character R-88