PC87366 datasheet(164/240 Pages) NSC

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9.0 Game Port (GMP) (Continued)

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9.3.10

Game Device B X-Axis Position Low Byte (GMPBXL)

Reading this register returns the value of the low byte of the X-axis position counter of game Device B. Before reading this

register verify that bit 2 of GMPXST (Device B Position Counter Ready) is set to 1. Writing to the offset of this register is

ignored.

This register is functional only in Enhanced mode.

Location:

Offset 08h

Type:

9.3.11

Game Device B X-Axis Position High Byte (GMPBXH)

Reading this register returns the value of the high byte of the X-axis position counter of game Device B. Before reading this

register verify that bit 2 of GMPXST (Device B Position Counter Ready) is set to 1. Writing to the offset of this register is

ignored.

This register is functional only in Enhanced mode.

Location:

Offset 09h

Type:

9.3.12

Game Device B Y-Axis Position Low Byte (GMPBYL)

Reading this register returns the value of the low byte of the Y-axis position counter of game Device B. Before reading this

register verify that bit 3 of GMPXST (Device B Position Counter Ready) is set to 1. Writing to the offset of this register is

ignored.

This register is functional only in Enhanced mode.

Location:Offset 0Ah

Type:

9.3.13

Game Device B Y-Axis Position High Byte (GMPBYH)

Reading this register returns the value of the high byte of the Y-axis position counter of game Device B. Before reading this

register verify that bit 3 of GMPXST (Device B Position Counter Ready) is set to 1. Writing to the offset of this register is

ignored.

This register is functional only in Enhanced mode.

Location:Offset 0Bh

Type:

Bit

76543210

Name

Device B X-Axis Position Counter Low Byte

Reset

00000000

Bit

76543210

Name

Device B X-Axis Position Counter High Byte

Reset

00000000

Bit

76543210

Name

Device B Y-Axis Position Counter Low Byte

Reset

00000000

Bit

76543210

Name

Device B Y-Axis Position Counter High Byte

Reset

00000000

PC87366 数据表(PDF) 164 Page - National Semiconductor (TI)

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PC87366 数据表(PDF) 164 Page - National Semiconductor (TI)

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