Back in '87 the extent of what had been altered was trivial - mostly Max Boost #s, Fan On/Off controls, limiters and TCC lockup speeds. In the next few years chip makers figured out how to alter the timing tables, idle parameters and eventually programs came out to allow the DIYer to make chips. We also saw the arrival of thumbwheel chips.
Once that became 'old-hat', a few companies (I am familiar with one in particular) began altering the software included on the chip. And in the 90's TR owners had the options of anti-theft, 2-step rev limiters, full-time open-loop chips, boost launch control, lean-highway-cruise, gear-dependent boost and timing, shift lites, etc., etc.
The latest significant development in chips was the ability to double the resolution of the MAF sensor
and the ability to work with alternative MAF sensors. The latter being of major importance as the TR MAF sensors are no more.
In summary, I can answer your question as I can answer most questions...."it depends." You probably should acquire a new chip, however, it depends on what you want from your TR as to which chip to select.
