Welcome to another instalment of On Call, the reader-contributed column The Register publishes each Friday as a cathartic service for readers who know that dealing with tech support BS can be a cow of a job. This week, meet a reader we’ll Regomize as "Jason" who told us he had helped an agricultural equipment dealer with his computer issues for about 20 years. "One day this guy called me to ask if I could help at a farm in Yorkshire, where he’d arranged the supply and installation of a fairly substantial system that used a computer to do effectively everything for a few hundred cattle," he told On Call. "That meant individually feeding them, measuring milk yields, planning pregnancies, and periodically submitting all the data to the government." Jason said other tech support folk had tried, and failed, to fix the system. "This had somewhat soured the relationship between the agricultural equipment dealer and the farmer," he punned in his email to On Call. Well punned, Jason. But we digress. "Despite not being fond of wading around in cow shit at four in the morning, I agreed to take a look at the system," Jason told us. By this time he had learned that the farm produced many tons of milk each week, so assumed he would find serious industrial-scale tech once he reached the farm. That assumption was wrong…