Implement instruction: Bcc

[tjhancocks]

Feature Request
An implementation for the Bcc instruction needs to be added to the emulation layer. Below is a brief description of the Bcc instructions taken from the M68000 Programmers Reference Manual.

If the specified condition is true, program execution continues at location (PC) + displacement. The program counter contains the address of the instruction word for the Bcc instruction plus two. The displacement is a twos-complement integer that represents the relative distance in bytes from the current program counter to the destination program counter. If the 8-bit displacement field in the instruction word is zero, a 16-bit displacement (the word immediately following the instruction) is used. If the 8-bit displacement field in the instruction word is all ones ($FF), the 32-bit displacement (long word immediately following the instruction) is used. Condition code cc specifies one of the following conditional tests (refer to Table 3-19 for more information on these conditional tests):

Mnemonic	Condition
CC(HI)	Carry Clear
CS(LO)	Carry Set
EQ	Equal
GE	Greater or Equal
GT	Greater Than
HI	High
LE	Less or Equal
LS	Low or Same
LT	Less Than
MI	Minus
NE	Not Equal
PL	Plus
VC	Overflow Clear
VS	Overflow Set

Describe the solution you'd like
The solution should match the existing conventions and patterns used by other implemented instructions. At the time of reporting this only includes the ABCD instruction.

Describe alternatives you've considered
N/a

Additional context
N/a