-extern int timer_a_next_oflow, timer_a_step, timer_a_offset; // in z80 cycles\r
-extern int timer_b_next_oflow, timer_b_step, timer_b_offset;\r
+extern int timer_a_next_oflow, timer_a_step; // in z80 cycles\r
+extern int timer_b_next_oflow, timer_b_step;\r