TI-59 magnetic card

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File Format
Name TI-59 magnetic card
Ontology
Released 1977


The TI-59 was a programmable calculator from Texas Instruments which was available from 1977 through 1983. It supported the ability to load and save programs using a magnetic-stripe card reader. The TI-58 model was also available at the same time with similar programming features but no card reader.

If you ran out of magnetic cards for it, it was apparently possible to make new ones by cutting up floppy disks.

The card reader used a four-track head designed to function at a speed between 2.0 and 2.5 inches per second. Track one is closest to the edge of the card. The write signal is a square wave of +/- 1.5 V.

Character/Key Codes

Each key, character, or function on the calculator corresponded to a numeric code of two decimal digits. (How, exactly, this translated into particular magnetic pulses on the card is uncertain.)

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References

Code Key Description
00 0 Number keys
01 1
02 2
03 3
04 4
05 5
06 6
07 7
08 8
09 9
10 E Function keys
11 A
12 B
13 C
14 D
15 E
16 A
17 B
18 C
19 D
20 CLR Clear
21 2ND Shift to alternate function
22 INV
23 LNX
24 CE
25 CLR
26 2ND
27 INV
28 LOG
29 CP
30 TAN
31 LRN
32 X:T
33 X^2
34 √X
35 1/X
36 PGM
37 P/R
38 SIN
39 COS
40 IND
41 SST
42 STO Memory store
43 RCL Memory recall
44 SUM
45 Y<>X
46 INS Insert program line
47 CMS
48 EXC
49 PRD
50 I I
51 BST
52 EE Enter exponent
53 (
54 )
55 ÷
56 DEL Delete program line
57 ENG
58 FIX
59 INT
60 DEG Degrees
61 GTO Goto
62 PG*
63 EX*
64 PD*
65 x
66 PAU
67 X=T
68 NOP No-Op
69 OP
70 RAD Radians
71 SBR Subroutine
72 ST*
73 RC*
74 SM*
75 -
76 LBL Label
77 X≧T
78 SIC $
79 ×
80 GRD
81 RST
82 HIR
83 GO*
84 OP*
85 $
86 STF
87 IFF
88 DMS
89 π
90 LST
91 R/S
92 RTN Return from subroutine
93 .
94 ±
95 =
96 WRT
97 DSZ Decrement and skip at zero
98 ADV
99 PRT Print
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