Controller Port
From Archaic Pixels
Revision as of 20:35, 30 November 2016 by MooZ (Talk | contribs) (Created page with "The 8 pins of the joypad connector are: * pin 1 - Vcc * pin 2 - D0 * pin 3 - D1 * pin 4 - D2 * pin 5 - D3 * pin 6 - SEL * pin 7 - CLR * pin 8 - GND The joypad port is acces...")
The 8 pins of the joypad connector are:
- pin 1 - Vcc
- pin 2 - D0
- pin 3 - D1
- pin 4 - D2
- pin 5 - D3
- pin 6 - SEL
- pin 7 - CLR
- pin 8 - GND
The joypad port is accessible at the address $1000.
Reading $1000 returns the states of pins 2, 3, 4 and 5 as long as the following informations :
- bit 7 - CD-ROM base unit presence.
- bit 6 - Country detection (0: Japan, 1: US)
- bit 5 - Unused (always 1)
- bit 4 - Unused (always 1)
- bit 3 - Joypad port 5 (D3)
- bit 2 - Joypad port 4 (D2)
- bit 1 - Joypad port 3 (D1)
- bit 0 - Joypad port 2 (D0)
Writing bit 0 and 1 of $1000 will update pin 6 and 7 states.
- bit 1 - Joypad port 7 (CLR)
- bit 0 - Joypad port 6 (SEL)
