Amdahl Corp shares took a knock yesterday, off 62.5 cents at $15.125 at mid-morning after Prudential Securities analyst Rick Martin cut his earnings estimate for the company, citing his concern that the European market is slackening as Amdahl makes its transition to the 5995 machines: he is now looking for 20 vents a share for the current quarter, a 33% reduction on what he had been going for, against 27 cents a share a year ago; old news, said Amdahl – we told analysts about both already.