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The Texas Instruments [[TI-58]]/[[TI-58C]]/[[TI-59]] calculators were programmable, and program storage took the form of a sequence of codes which (mostly) corresponded to the position of keys on the calculator keypad. Here is a simplified diagram of the basic key layout:
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The code for this alternate function is derived from that of the original key function by adding 5 to the units digit (''without'' carry to the tens digit). Thus, the key codes corresponding to the position of the {{TI-5x/Keys/Yellow|2nd}} key itself (21 and 26) are never used as opcodes. Here is the table of the codes produced with the {{TI-5x/Keys/Yellow|2nd}} prefix:
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! ||''x''6||''x''7||''x''8||''x''9||''x''0
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But, because of the use of the 00 .. 09 codes for the {{TI-5x/Keys/White| 0 }} .. {{TI-5x/Keys/White| 9 }} keys, the codes 62-64, 72-74, 82-84 and 92 are available for other uses. So most of these are reallocated to represent ''op'' {{TI-5x/Keys/Alt|Ind}} sequences:
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