They were using Riposte from https://www.eschergroup.com/riposte-platform/ https://www.eschergroup.com/riposte-platform/ and Oracle. They were using dial up IS

They were using Riposte from https://www.eschergroup.com/riposte-platform/ https://www.eschergroup.com/riposte-platform/ and Oracle. They were using dial up ISDN lines to send the data back, but Riposte didn't support that, or scale to 20k terminals, so that was all new code In general they had a distributed database that couldn't do ACID https://www.postofficetrial.com/2019/12/fisking-horizon-trial-1-meaning-of.html https://www.postofficetrial.com/2019/12/fisking-horizon-tria... https://www.computerweekly.com/news/252496560/Fujitsu-bosses-knew-about-Post-Office-Horizon-IT-flaws-says-insider https://www.computerweekly.com/news/252496560/Fujitsu-bosses... https://www.benthamsgaze.org/2021/07/15/what-went-wrong-with-horizon-learning-from-the-post-office-trial/ https://www.benthamsgaze.org/2021/07/15/what-went-wrong-with...