Rick and Jed --

Bonnie has reports that at 4:00pm the game in Milpitas Golfland 
has a problem. When they power the game off and on, the problem 
goes away. The problem is that the player pedals, but he does 
not travel down the road. Bonnie has never seen this, but 
suspects that she is not reading the opto for some reason.

What I'm wondering is if the opto is read through an I/O chip 
that requires initializing. If so, maybe the line is noisy and 
the chip is getting glitched. If so, maybe we can initialize 
the chip at the start of each wave.

Also, Bonnie thought there might be a way to monitor the line 
voltage with the Multisync hardware. 

Any help would be appreciated.

Thanks!

John

1. The only problem I can think of relates to the use of the new OptoCoupler
Pot. When this pot is used, Resistors R182, R183, and R184 mut be removed.
(They do not appear on the production parts list.)

2. In the Driver, one of the 8 bit A/D inputs was connected to a half wave,
unfiltered sample from one of the transformer secondaries. In Self-Test I
calculated RMS by appropriate MultiPlies and Square Root routines.

The routines were never installed in a MultiSync and would take time to
convert. The harness and power supply board would have to be modified to
provide this additional signal.

The following is a description of the Opto Reader:

   
Optocoupler Decoding Means
--------------------------
The quadrature outputs of the Optocoupler are latched at 8 MHz in 185U. 
These latched outputs (NEWQ0 and NEWQ1) are once again latched at 8 MHz to 
provide a delayed version of the signals (OLDQ0 and OLDQ1).

The reason for creating delayed versions of the signals is to permit the
detection of signal edges by PROM 195U.

The PROM determines whether a counter should be clocked, and if so, in
what direction.

The Latch/PROM do not constitute a state machine since there is no feedback
from the PROM.

If an illegal state is produced, the PROM will not clock the counter.

One 8 MHz clock after Q0 and Q1 from the OptoCoupler produce a valid sequence
the circuit will operate. It cannot get hung up.


	SECTION PROGRAM

*	           __________	         _______
*	__________/          \__________/

*	_____    	 __________
*	     \__________/          \__________	
*
*	       0    2     3    1      0
*
*
* Forward  0,2,3,1,0
* Reverse  0,1,3,2,0
*
*							 D2  D1	 D0
* New 1	   New 0    Old 1    Old 0	New Old	        ERR  /R	 /F
* -----    -----    -----    -----      --- ---	       	---  --	 --
*   0	     0	      0	       0	 0   0	-	 0   1	 1	3  	
*   0	     0	      0	       1	 0   1	F	 0   1 	 0	2
*   0	     0	      1	       0	 0   2	R	 0   0 	 1	1
*   0	     0	      1	       1	 0   3	ERR	 1   1   1	7
*   0	     1	      0	       0	 1   0	R	 0   0   1	1
*   0	     1	      0	       1	 1   1	-	 0   1   1	3
*   0	     1	      1	       0	 1   2	ERR	 1   1   1	7
*   0	     1	      1	       1	 1   3	F	 0   1   0	2
*   1	     0	      0	       0	 2   0	F	 0   1   0	2
*   1	     0	      0	       1	 2   1	ERR	 1   1   1	7
*   1	     0	      1	       0	 2   2	-	 0   1   1	3
*   1	     0	      1	       1	 2   3	R	 0   0   1	1
*   1	     1	      0	       0	 3   0	ERR	 1   1   1	7
*   1	     1	      0	       1	 3   1	R	 0   0   1	1
*   1	     1	      1	       0	 3   2	F	 0   1   0	2
*   1	     1	      1	       1	 3   3	-	 0   1   1	3
*
*


	DC.B	3,2,1,7,1,3,7,2
	DC.B	2,7,3,1,7,1,2,3

	DC.B	3,2,1,7,1,3,7,2
	DC.B	2,7,3,1,7,1,2,3


	END

Jed -- Now really, what kind of a name is "BM"?!!
Thanks for your reply. We'll scrap the idea for monitoring the power.
Instead, we will ask Minh to verify the resistors are removed and check
the appropriate voltages with a DVM.
Thanks!!
John

Minh --

We need to try to find out why the game does not work right 
sometimes. The symptoms are that at 4:00 you pedal but don't go 
anywhere. When the power is turned off and on, everything is ok 
again. Bonnie thinks it has to do with the opto sensor. Or 
could it be the brakes are on?

Anyway, Jed suggested we check that R182, R183, R184 are 
removed. Could you also check the line voltage while the game 
is operating? Maybe there is not enough capacity for this game. 
You could also check to see if 5V is 5V.

Let me know if this is a problem or if you have other ideas.

Thanks!!

John

I meant BMXI sent the message from my PC, and my X key is flakey.

One more time. I meant BMX but my X key is flakey.

Jed

Take 3.

I meant BMX but my X key is flakey.

Jed