CONNECTOR PIN USAGE FOR PROPORTIONAL INPUTS
PIN MNEMONIC DESCRIPTION HARDWARE REGISTER/NOTES
--- -------- ----------- -----------------------
1 XBUT Extra Button
2 Unused
3 LBUT* Left button See Digital Joystick
4 RBUT* Right button See Digital Joystick
5 POTX X analog in POT[0/1]DAT<7:0>, POTGO, POTINP
6 Unused
7 +5V 125ma max, 200 ma surge
8 Ground
9 POTY Y analog in POT[0,1]DAT<15:8>, POTGO, POTINP
GAME PORT INTERFACE TO LIGHT PEN
A light pen is an optoelectronic device whose light-sensitive portion
is placed in proximity to a CRT. As the electron beam sweeps past the
light pen, a trigger pulse is generated which can be enabled to latch the
horizontal and vertical beam positions. There is no hardware bit to
indicate this trigger, but this can be determined in the two ways
as shown in chapter 8, "Interface Hardware."
Light pen position is usually read during blanking, but MAY be available
prior to that.
CONNECTOR PIN USAGE FOR LIGHT PEN INPUTS
PIN MNEMONIC DESCRIPTION HARDWARE REGISTER/NOTES
--- -------- ----------- -----------------------
1 Unused
2 Unused
3 Unused
4 Unused
5 LPENPR* Light pen pressed See Proportional Inputs
6 LPENTG* Light pen trigger VPOSR, VHPOSR
7 +5V 125ma max, 200 ma surge Booth ports
8 Ground
9 Unused
Note: depending on the maker, the light pen input may be either.
- Appendix E 309 -
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