It wants the other 50 percent divided among the Communists, itself, the Socialists and two small officially recognized parties in Slovakia, CTK reported.

Adamec left halfway through the two-hour meeting with other parties yesterday, striding grimly toward his official sedan in silence.

Party chief Karel Urbanek and several members of the ruling Politburo were present at the meeting in which Adamec resigned.

In a televised address Wednesday, Adamec had said he would quit if the opposition did not stop presenting "ultimatums."

Opposition leaders yesterday rejected charges that they had put Adamec under pressure to change the Communist-dominated Cabinet sworn in last Sunday. which they rejected because it included only five non-Communists.

They have said they want a new interim government to build the legal basis for parliamentary democracy and hold free elections by July.

On Monday, hundreds of thousands of people demonstrated in Prague and Bratislava, Czechoslovakia's two largest cities, against Adamec's new Cabinet. He reopened negotations with the opposition Tuesday.