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Most of the keys on the keypad can be used as symbolic labels. For example, sequences like {{TI-5x/Keys/Brown|GTO}} {{TI-5x/Keys/Brown|STO}} and {{TI-5x/Keys/Brown|GTO}} {{TI-5x/Keys/Brown|GTO}} are legitimate, provided that {{TI-5x/Keys/Brown|STO}} and {{TI-5x/Keys/Brown|GTO}} have in fact been defined as labels somewhere in the program.
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Most of the keys had multiple functions, depending on whether {{TI-5x/Keys/Brown|INV}} or {{TI-5x/Keys/Yellow|2nd}} had been pressed beforehand. {{TI-5x/Keys/Brown|INV}} invoked the “inverse” (whatever that meant) of the following function, and was recorded in a program as a separate keystroke (code 22), while {{TI-5x/Keys/Yellow|2nd}} invoked a completely different function which was written on the keypad faceplate just above the key. For example, pressing {{TI-5x/Keys/Yellow|2nd}} {{TI-5x/Keys/Brown|x²}} invoked the {{TI-5x/Keys/Alt|sin}} function.
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.
{| border="1" cellpadding="2"
|----
| ||''x''6||''x''7||''x''8||''x''9||''x''0
|-
|1''x''
|{{TI-5x/Keys/Alt| A´ }}||{{TI-5x/Keys/Alt| B´ }}||{{TI-5x/Keys/Alt| C´ }}||{{TI-5x/Keys/Alt| D´ }}||{{TI-5x/Keys/Alt| E´ }}
|-
|2''x''
| ||{{TI-5x/Keys/Brown|INV}}||{{TI-5x/Keys/Brown|ln''x''}}||{{TI-5x/Keys/Brown|CE}}||{{TI-5x/Keys/Yellow|CLR}}
|-
|3''x''
|{{TI-5x/Keys/Brown|LRN}}||{{TI-5x/Keys/Brown|x⇌t}}||{{TI-5x/Keys/Brown|x²}}||{{TI-5x/Keys/Brown|√x}}||{{TI-5x/Keys/Brown|1/x}}
|-
|4''x''
|{{TI-5x/Keys/Brown|SST}}||{{TI-5x/Keys/Brown|STO}}||{{TI-5x/Keys/Brown|RCL}}||{{TI-5x/Keys/Brown|SUM}}||{{TI-5x/Keys/Brown|y<sup>x</sup>}}
|-
|5''x''
|{{TI-5x/Keys/Brown|BST}}||{{TI-5x/Keys/Brown|EE}}||{{TI-5x/Keys/Brown| ( }}||{{TI-5x/Keys/Brown| ) }}||{{TI-5x/Keys/Yellow| ÷ }}
|-
|6''x''
|{{TI-5x/Keys/Brown|GTO}}||{{TI-5x/Keys/White| 7 }}||{{TI-5x/Keys/White| 8 }}||{{TI-5x/Keys/White| 9 }}||{{TI-5x/Keys/Yellow| × }}
|-
|7''x''
|{{TI-5x/Keys/Brown|SBR}}||{{TI-5x/Keys/White| 4 }}||{{TI-5x/Keys/White| 5 }}||{{TI-5x/Keys/White| 6 }}||{{TI-5x/Keys/Yellow| - }}
|-
|8''x''
|{{TI-5x/Keys/Brown|RST}}||{{TI-5x/Keys/White| 1 }}||{{TI-5x/Keys/White| 2 }}||{{TI-5x/Keys/White| 3 }}||{{TI-5x/Keys/Yellow| + }}
|-
|9''x''
|{{TI-5x/Keys/Brown|R/S}}||{{TI-5x/Keys/White| 0 }}||{{TI-5x/Keys/White| . }}||{{TI-5x/Keys/White|+/-}}||{{TI-5x/Keys/Yellow| = }}
|----
|}
TBD
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