Wrong. The 1982-85 Toyota Celica-Supra had IRS. The L type supras in the US also had all digital dashboards along with a "trip computer" that gave you estimated mileage left on the tank of gas, and the miles per gallon which was calculated by the injector pulses, you can see the trip computer output in the lower right:
Also, the stock stereo came with an amplified 7 EQ AM/FM/tape deck and automatic air conditioning which can be seen in this same picture:
So, japanese cars were fairly advanced in the 80s, especially compared to their american competition.