Keystroke programming: Difference between revisions

Revision as of 12:10, 4 March 2015

Revision as of 05:55, 31 January 2017

Line 5:

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:

{| border="1" cellpadding="2" class="wikitable"

|----

|! ||''x''1||''x''2||''x''3||''x''4||''x''5

|-

|!1''x''

|{{TI-5x/Keys/Brown| A }}||{{TI-5x/Keys/Brown| B }}||{{TI-5x/Keys/Brown| C }}||{{TI-5x/Keys/Brown| D }}||{{TI-5x/Keys/Brown| E }}

|-

|!2''x''

|{{TI-5x/Keys/Yellow|2nd}}||{{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^x}}

|-

|!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| = }}

|----

Line 42:

Now consider a very simple program, which adds 2 to the number being displayed, and then stops. The program is entered starting from program ___location 000, and looks like this:

{| class="wikitable"

{|

|-

|!Location||Contents||Meaning||Comments

|-

|000||85||+||

|-

|001||02||2||

|-

|002||95||=||compute result

Line 76:

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:

{| border="1" cellpadding="2" class="wikitable"

|----

|! ||''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/Alt|log}}||{{TI-5x/Keys/Alt|CP}}||{{TI-5x/Keys/Yellow|CLR}}

|-

|!3''x''

|{{TI-5x/Keys/Alt|Pgm}}||{{TI-5x/Keys/Alt|P→R}}||{{TI-5x/Keys/Alt|sin}}||{{TI-5x/Keys/Alt|cos}}||{{TI-5x/Keys/Alt|tan}}

|-

|!4''x''

|{{TI-5x/Keys/Alt|Ins}}||{{TI-5x/Keys/Alt|CMs}}||{{TI-5x/Keys/Alt|Exc}}||{{TI-5x/Keys/Alt|Prd}}||{{TI-5x/Keys/Alt|Ind}}

|-

|!5''x''

|{{TI-5x/Keys/Alt|Del}}||{{TI-5x/Keys/Alt|Eng}}||{{TI-5x/Keys/Alt|Fix}}||{{TI-5x/Keys/Alt|Int}}||{{TI-5x/Keys/Alt||x|}}

|-

|!6''x''

|{{TI-5x/Keys/Alt|Pause}}||{{TI-5x/Keys/Alt|x=t}}||{{TI-5x/Keys/Alt|Nop}}||{{TI-5x/Keys/Alt|Op}}||{{TI-5x/Keys/Alt|Deg}}

|-

|!7''x''

|{{TI-5x/Keys/Alt|Lbl}}||{{TI-5x/Keys/Alt|x≥t}}||{{TI-5x/Keys/Alt|∑x}}||{{TI-5x/Keys/Alt|mean(x)}}||{{TI-5x/Keys/Alt|Rad}}

|-

|!8''x''

|{{TI-5x/Keys/Alt|St flg}}||{{TI-5x/Keys/Alt|If flg}}||{{TI-5x/Keys/Alt|D.MS}}||{{TI-5x/Keys/Alt|π}}||{{TI-5x/Keys/Alt|Grad}}

|-

|!9''x''

|{{TI-5x/Keys/Alt|Write}}||{{TI-5x/Keys/Alt|Dsz}}||{{TI-5x/Keys/Alt|Adv}}||{{TI-5x/Keys/Alt|Prt}}||{{TI-5x/Keys/Alt|List}}

|----

Line 115:

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:

{| border="1" cellpadding="2" class="wikitable"

|----

|! ||''x''2||''x''3||''x''4||

|-

|!6''x''

|{{TI-5x/Keys/Alt|Pgm}} {{TI-5x/Keys/Alt|Ind}}||{{TI-5x/Keys/Alt|Exc}} {{TI-5x/Keys/Alt|Ind}}||{{TI-5x/Keys/Alt|Prd}} {{TI-5x/Keys/Alt|Ind}}

|-

|!7''x''

|{{TI-5x/Keys/Brown|STO}} {{TI-5x/Keys/Alt|Ind}}||{{TI-5x/Keys/Brown|RCL}} {{TI-5x/Keys/Alt|Ind}}||{{TI-5x/Keys/Brown|SUM}} {{TI-5x/Keys/Alt|Ind}}

|-

|!8''x''

| ||{{TI-5x/Keys/Brown|GTO}} {{TI-5x/Keys/Alt|Ind}}||{{TI-5x/Keys/Alt|Op}} {{TI-5x/Keys/Alt|Ind}}

|-

|!9''x''

|{{TI-5x/Keys/Brown|INV}} {{TI-5x/Keys/Brown|SBR}}|| || 

|----