Texas Instruments TI-74 BASIC programmable calculator

General specifications
Type BASIC programmable calculator
Production years 1985 - -
New price USD 100
Operating system n.a.
Chipset/CPU -
I/O I/O port, expansion port
Performance index 27
Entry method Algebraic with precedence
Precision 14 digits
Advanced functions

Forensic result 8.999999616563

BASIC programmable calculator: Texas Instruments TI-74
Programming model BASIC
Programming features

Program display Text
Program editing Text editor
Programming 8 kB
Data 8 kB
ROM 32 kB
Functions + -
Type LCD
Size 31 characters
LWH 2029626 mm
Weight 453 g
Batteries 4AAA
External power -
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Related calculators (system generated)

Texas Instruments CC-40
Texas Instruments TI-74S


Full name is TI-74 BASICALC. Very nice tool. And I say tool, because the TI-74 is not just a calculator. It comes with an industry strength plasic cover, and the whole thing feel heavy and strong. It's an engineering tool, not just a calculator.

Programming the TI-74 is easy, especially if you have some familiarity with BASIC. If you prefer Pascal, there is an optional Learn Pascal ROM module that has a very nice Pascal interpreter. Documentation is exellent, both for the calculator itself as for the modules and peripherals.

Performance index

The performance index listed in the specs above was calculated in the default BASIC programming mode of the TI-74. I also own the Learn Pascal module, so I thought it interesting to see if performance differed when using that. I used the following program to measure the performance:
100 PROGRAM perf;
110 VAR w,i:INTEGER; x:REAL;
120 FOR w:=1 TO 10 DO
140 FOR i:=1 TO 10 DO
160 x:=i;
170 x:=x+1;
180 x:=x-.0004567;
190 x:=x+70;
200 x:=x-69;
210 x:=x*7;
220 x:=x/11;
230 END (* i *)
240 x:=LOG(x);
250 x:=SIN(x);
260 x:=SQR(x);
270 x:=SQR(x);
280 END (* w *)
290 WRITELN(x);
300 END.

It turned out that the performance index when using Pascal comes to 20. Slightly less than the default BASIC value. Not surprising really, as there is probably some overhead from the translation from Pascal to native code.

Measured results:
Mode    Time   P.Index
BASIC   12.5s  27.2
PASCAL  16.6s  20.5

For reference, here is the listing of the BASIC program I used:
100 FOR w=1 TO 10
110 FOR i=1 TO 10
120 x=i
130 x=x+1
140 x=x-.0004567
150 x=x+70
160 x=x-69
170 x=x*7
180 x=x/11
190 NEXT
200 x=LOG(x)
210 x=SIN(x)
220 x=SQR(x)
230 x=SQR(x)
240 NEXT
250 PRINT x

Successor to the CC-40?

According to some sources , the TI-74 may be considered the successor to the legendary Texas Instruments CC-40


BASIC programmable calculator: Texas Instruments TI-74

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This page was last modified on November 28th, 2009

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3 Responses so far


I have lost/transferred the manual many years ago for the "statistics" module of the TI-74. So, I am not able to call the programmes of this module therefore now any more.
I would be very grateful if somebody has a manual to this "statistics" module.
I would be very grateful if somebody has a manual to this statistics module and could scan in and deliver this to me.
Many thanks for the efforts already in advance.
March 29th, 2009
Hi Curtis,

Thanks a lot for the link, very interesting reading. I might even get my soldering iron from the basement :)
February 19th, 2009
Seeing that the 74 using the same cpu, 7000, and the dockbus is the hexbus rearranged into one row, yes the 74 is the successor to the CC-40!

A person who is somewhat proficient with a soldering iron can even build a converter to switch between dockbus (TI-74) and hexbux (CC-40). I show how on my web page.
Curtis McCain
February 17th, 2009