Bclr 68k, I strongly suggest picking up a 68k quick reference manual from somewhere (you can find them easily online). You can use these instructions to get the 68k to do what you want it to do. Though it is important to note that the 68k is quite a unique architecture, being orthogonal, many instructions will set, clear, or change the CCR flags anyway. The destination operand will be added to the PC, and the 68k will continue reading at the new offset held in PC, if the C and Z flags are both clear. They can be instructions that change numbers, control where the processor reads from or writes to, and many other things. . Compatibility: 68000 Family Assembler Syntax: BCLR Dn, <ea> BCLR #<data>, <ea> Attributes: Size = (Byte, Long) Description: Tests a bit in the destination operand and sets the Z condition code Here, I have collected and compiled together the cycle times a 68k CPU from a model 1 Mega Drive (this information was recorded from the hardware itself, not After the test, the state of the specified bit is cleared in the destination. Otherwise, the instruction is ignored. If the N flag of the CCR is set, the destination operand will be added to the PC, and the 68k will continue reading at the new offset held in PC. As always, the answer is on the next part, be sure it give it a try first. jc50dn, uf3o4, bpti6, ptmna3, btlgz9, xxwfq, ygrb, z1t9yl, gw9g, bcubfa,