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TI-92 Expansion Port

 

TI-92_1.jpg (79081 Byte)The TI-92 introduced early in 1996 featured a small Expansion Port on the backside of its housing. With the complete address- and data-bus of the M68000 compatible CPU available, upgrades of both the Operating System and user memory capacity were made easy.

TI-92 I0696 module

TI-92_I0696_MOD_PCB.jpg (136813 Byte)TI-92_I0696_MOD_T.jpg (34245 Byte)Texas Instruments used at the very beginning of the TI-92 market introduction OTP-ROM (One-time Programmable Read-Only Memory) for the Operating System of the calculator instead the later Mask-ROM soldered on the main printed circuit board (PCB). The printed circuit board (PCB) of the module contains two integrated circuits: 

OTP-ROM: 2*AT27C040, 256k*8, each 

 

TI-92 E module

TI-92E_MOD_P1.jpg (453299 Byte)The TI-92 E module was introduced early in 1996 and added the choice of 5 user languages (English, French, German, Italian and Spanish) and an additional 128k User memory. The printed circuit board (PCB) of the module contains two integrated circuits: 

ROM: IEC9895S-960819E, 1M*8
RAM: TC551001B, 128k*8

 

TI-92 II module

The TI-92 II module was introduced early in 1996 and added the choice of 5 user languages (English, French, German, Italian and Spanish) and an additional 128k User memory. The printed circuit board (PCB) of the module contains two main integrated circuits: 

Flash-ROM: Sharp LH28F016S, 2M*8 
RAM: TC551001B, 128k*8

 

TI-92 Plus module

TI-92PL_MOD_PCB.jpg (195719 Byte)The TI-92 Plus module was announced November 7, 1997 and arrived mid-1998 in the shelves for about $75. It boosted the TI-92 with the enhanced Flash-technology into an user-upgradable calculator. Compared with the pre-programmed Operating Systems of both the TI-92 and TI-92 II the Flash-memory of the TI-92 Plus module could be re-programmed by the user with a simple download cable connected to a personal computer. The printed circuit board (PCB) of the module contains two main integrated circuits: 

Flash-ROM: Sharp LH28F016S, 2M*8
RAM: TC551001B, 128k*8

It took another year before the "real" TI-92 Plus calculator was introduced.

 

If you have additions to the above article please email: joerg@datamath.org.

Joerg Woerner, June 8, 2003. No reprints without written permission.