New rules drawn up to safeguard exam standards mean that sixth-formers taking A-level maths in 2002 will only be allowed to use officially-approved basic calculators for some papers.
"Computers, graphic calculators, and calculators with computer algebra functions" are all excluded, say the rules.
Once a calculator specification has been agreed with the exam boards, the Government's Qualifications and Curriculum Authority may invite tenders from manufacturers for a bulk order of the machines.
Such a contract could prove lucrative, with the QCA's Richard Browne suggesting an initial production run of 100,000 and annual runs of around 50,000 thereafter. The expectation is that a bulk order will reduce the cost of the calculators to schools and students - perhaps to as little as pound;2-pound;3 each.
The changes are the result of the introduction, from September 2000, of modular A and AS-level courses. New assessment rules mean a quarter of students' final grades must be awarded on the basis of core papers taken with the aid only of a basic scientific calculator.
Mr Browne, the QCA's principal maths subject officer, said: "A simple calculator to our specification is what we think would meet the requirements. At the moment our rules don't exclude any calculator from any exam."
The move to a "limited calculator paper" is seen as a compromise between government demands for a calculator-free paper, and concern in the wider maths community about the appropriateness of such a paper at advanced level.
The QCA is setting up a committee with the examining bodies to look into exam costs, and the calculator issue will be a key task.