Command 2107: Acquires the status of the specified memory I/O port in bytes

Acquires the status of the specified memory I/O port.

Each port contains 8 memory bits.

Command Syntax

	bit	Name	Description
Parameter 1	15	byteportNumber	Specifies the byte port of the memory I/O.
	14
	｜
	1
	0

Response Syntax

	bit	Name	Description
Response 1	15	reserved	Returns “0”.
	｜
	8
	7	returnValue	Returns the integer from 0 to 255. The return value is 8 bits, with each bit corresponding to 1 memory I/O bit.
	6
	5
	4
	3
	2
	1
	0

Description

By using the command, you can check values of eight memory I/O bits at the same time.

Since eight channels can be checked at a time, the return values are integers ranging from 0-255. See the chart below to check the correspondence of the integer return values and each memory I/O bit.

Memory I/O Bit Result (Using Port #0)

Return Value	7	6	5	4	3	2	1	0
1	off	off	off	off	off	off	off	on
5	off	off	off	off	off	on	on	on
15	off	off	off	off	on	on	on	on
255	on	on	on	on	on	on	on	on

Memory I/O Bit Result (Using Port #31)

Return Value	255	254	253	252	251	250	249	248
3	off	off	off	off	off	off	on	on
7	off	off	off	off	off	on	on	on
32	off	off	on	off	off	off	off	off
255	on	on	on	on	on	on	on	on

Example

When acquiring the status of Port #0.

The status of Port #0 is 32.

Command	Response
083BH 0000H	083BH 0010H