Hmmm. Here's about as much information as I have on it.
When I first got my supra - all I wanted to do was get it to BPU power levels - and leave it at that - it was going to be a daily driver. Only thing I didn't like was the
Fuel Cut Control so I opted for the ECU instead. Besides - I was from the 300zx school - stage 3 = Intake, Exhaust and ECU.
Anyway - pricing runs $1242 from Rod Millen Motorsports:
RMM Spec ECU Upgrade (93-96), but if you have a 97/98 car, you have to buy a 93-96 ECU first - (an additional $799)
More info at their web site:
G Force Engineering
TOYOTA Supra Twin Turbo
1993-1995
Full Ver: F,T,B,(R),S(MT only),C JZ80GT68AF 1350
Single Ver

F):F,B,(R),S(MT only) JZ80GT68ASF 775
Single Ver

T):T JZ80GT68AST 775
Feature Key: F:Fuel Map T:Ignition Timing Map B:Boost Limiter S:Speed Limiter C:Boost Control R:Rev Limiter V:VTEC Point
They DO sell the computer setup ( I actually think this is recent - I wasn't aware of it when I had the ECU put in...) here:
http://www.gforceengineering.com/tuningproducts.html
Doesn't really say what the cost of that is though.
Anyway - hope this was helpful in some way shape or form. Sorry I don't have more information. If anyone actually has the computer and software, I'd like to know what your impressions are.
Thanks,
-Darryl