Virtual Machine Instruction LinkPrevPG

Mnemonic: LinkPrevPG

Hex Code:	20	01	00	00	00	00	HH	07	unconditional
	20	M1	00	XX	00	YY	HH	07	M=1-7, Compare register XX to register YY
	20	M1	00	XX	KK	KK	HH	07	M=9-F, Compare register XX to constant KKKK

Action:	The LinkPrevPG command starts the previous program, and can set SPRM 8 to highlight a different button by setting "HH" (byte 6) to 4*button.
Order:	If a compare is specified, it is performed first. If the conditions are met the LinkPrevPG is executed.
Comments:	This command is intended to be used as a cell or button command. Other related commands are LinkTopPG and LinkNextPG. This command is also available as part of class 4, 5, and 6 commands.

Compare operation codes
register to register		register to constant		Alternate mnemonic	Comments
M	operation	M	operation	Alternate mnemonic	Comments
1	RegX & RegY	9	RegX & K	BC	Bitwise compare, the two operands are anded, if the result is non-zero the condition is true
2	RegX == RegY	A	RegX == K	EQ	If the two operands are equal the condition is true
3	RegX != RegY	B	RegX != K	NE	If the two operands are not equal the condition is true
4	RegX >= RegY	C	RegX >= K	GE	If RegX is greater than or equal to the right operand the condition is true
5	RegX > RegY	D	RegX > K	GT	If RegX is greater than the right operand the condition is true
6	RegX <= RegY	E	RegX <= K	LE	If RegX is less than or equal to the right operand the condition is true
7	RegX < RegY	F	RegX < K	LT	If RegX is less than the right operand the condition is true

Register Codes
0x00 through 0x0F	General Purpose registers 0 to 15 (GPRM)
0x80 through 0x97	System Parameter registers 0 to 23 (SPRM)
all others	do not use

Numerically

Alphabetically

Index

Alphabetically

Numerically

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