President Reagan has, as expected (CI No 810) retaliated against Brazil’s efforts to curb computer imports – in particular its ban on the import of Microsoft Corp’s MS-DOS, by imposing $105m in tariffs on Brazilian exports to the US, and put an embargo on imports of Brazilian computer products. A range of possible Brazilian products to suffer the punitive tariffs will be drawn up this week and hearings will be held before the final list is drawn up. The $105m is an estimate of the annual loss of business to US computer companies as a result of the Brazilian measures. Brazilian government sources say the sanctions will not persuade it to modify its informatics policy.