DATAMATH CALCULATOR MUSEUM
|
DATAMATH CALCULATOR MUSEUM |
Texas Instruments TI-74 BASICALC
| Date of introduction: | 1986 | Display technology: | LCD dot matrix |
| New price: | $135.00 (SRP 1988) DM 348.00 |
Display size: | 31 (10 + 3) |
| Size: | 3.8" x 8.0" x
1.0" 96 x 204 x 25 mm3 |
||
| Weight: | 10.3 ounces, 290 grams | Serial No: | 0001522 |
| Batteries: | 4*AAA | Date of manufacture: | mth 06 year 1987 |
| AC-Adapter: | Origin of manufacture: | Taiwan (I) | |
| Precision: | 13/14 | Integrated circuits: | CPU: TMC70009 ROM: HN61256 RAM: HM6264 |
| Memories: | 8kB RAM, 32kB ROM | ||
| Program steps: | Courtesy of: | Joerg Woerner | |
| Download leaflet: | 
(US: 1.7 MByte) |
The
TI-74 BASICALC is a cross-over of the earlier CC 40 Compact Computer and a
conventional calculator.
You have both a BASIC-language computer with a
total of 8 kByte memory and a calculator mode with algebraic input and immediate output
on the huge alphanumerical display.
The other features of the TI-74 are similar to its sibbling TI-95 PROCALC:
You may install RAM or ROM-cartridges in the expansion port or connect the PC-324 printer to the computer. The maximum capacity of the TI-74 BASICALC is 16 kByte of memory.
| Part | New price | Description |
| PC-324 | $115.00 (SRP 1988) | 24-column thermal printer |
| PA-201 | (SRP 1988) | Power adapter adaptor for TI-74, TI-95 |
| AC9201 | $19.00 (SRP 1988) | Mains adapter for PC-324 |
| TP-324 | $6.00 (SRP 1988) | Thermal paper for PC-324 |
| CI-7 | $35.00 (SRP 1988) | Cassette Interface |
| CM-8 | $50.00 (SRP 1988) | 8k Constant Memory Module (RAM) |
| Mathematics | $50.00 (SRP 1988) | Library (ROM) |
| Statistics | $50.00 (SRP 1988) | Library (ROM) |
| Learn Pascal | $50.00 (SRP 1988) | Library (ROM) |
| Finance | $50.00 (SRP 1988) | Library (ROM) |
| Chemical Engineering | $50.00 (SRP 1988) | Library (ROM) |
| TI-892F | $114.95 (SRP 1988) | 32k programmed EPROM Module (First) |
| TI-892D | $84.95 (SRP 1988) | 32k programmed EPROM Module (Dupl.) |
| TI-892E | $76.95 (SRP 1988) | 32k programmed EPROM Module (Bulk) |
In
1987 Texas Instruments introduced Programmable
Calculator News, a service for TI-74 and TI-95 users to feature program
listings, technical articles, question and answer segments, new product reviews, and user comments. All
Programmable Calculator News are
available for free download as a service provided by the Datamath Calculator
Museum.
Dismantling the featured TI-74 BASICALC manufactured in June 1987 reveals a rather complex
design with two printed circuit boards (PCB's).
CPU
(Central processing Unit): The Texas Instruments TMC70009 microcontroller is a
member of the TMS7000 family
manufactured in CMOS technology.
The original
design of the TMS7000 series was introduced in 1981 as an 8-bit extension of the
TMS1000
Familiy to compete with the Intel i8051, Motorola M6801, and Zilog Z8 parts. The
first chips sported 128 bytes of on-chip RAM (Random Access Memory) and either
2k Bytes or 4k Bytes of ROM (Read Only Memory). Later
versions, e.g. the TMS70C46 found in some TI-74 BASICALC computers featured 256
bytes of RAM.
The
HN61256
ROM
of this TI-74 BASICALC was manufactured by Hitachi and offers a capacity of 32k
Bytes.
RAM
(Random Access Memory): The RAM is used as data memory and is used to store both
variables, user programs and intermediate results. This
TI-74 BASICALC makes use of
HM6264 manufactured by Hitachi, Japan
DISPLAY:
The display drivers of the
TI-74 BASICALC are located on the second (lower) PCB and are not yet discovered.
A special OEM-version of the TI-74 was sold as TI-74S and TI-74S ALLIANZ.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, December 5, 2001. No reprints without written permission.
