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That sounds right. That would be the OBD1 ECU, most likely from an older GS-R. OBDII started in 1996, where the emissions controls and other things make them very hard to tune, and for most purposes impossible unless they're newer cars that companies like AEM and Hondata have learned to support.

The chip is inside your ECU box. Think of this chip as a re-writable CD. The first ''burn'' on this chip will be from the guys at phearable putting a "basemap" tune on it going by what you tell them has changed in your engine. Basemap tunes are meant to safely get you from wherever you built the car, to your dyno/tuner. They are generic, and are not meant for daily driving. You can buy the OBD1 ECU anywhere, but I trust phearable's basemaps. If you don't get built yet, then you won't need a tune, and can purchase wherever you like.

Once you find a tuner, they will dyno your car, and keep "burning" your chip until they get perfect Air/Fuel ratios (fuel maps), good ignition maps, settings, power etc.

Many programs like Uberdata, Crome, Crome Pro, Neptune, EZTune, are used by tuners to tune the chips in OBDI ECUs by removing the chips and putting them in a "burner" after each dyno run....this is free to you minus the cost of the ECU, and dyno time.

Things like Hondata S300 and the like allow you to burn info onto that chip WITHOUT removing the chip from the ECU after each run....just for faster datalogging and what not; not worth the huge money in my opinion....and hardly any tuners have the means to utilize it.