PIC P18F45K22 read Stern MPU bcd signal

[infrared pinball]

Hello,

i dont know if this is the right place to ask this

I have a Stern MPU in the bench that working perfect and i want with a pic microcontroller to read the bcd signal from mpu J1 connector and pins
25=A,26=B,27=C,28=D
I use port B of pic B0,B1,B2,B3 and set that pins as input.

After the seven flash i set the pinball mpu to first test by ground j3 pin to ground for a moment to set the display to count from 0 to 9.

The problem is that the bcd code i get is only 0000 or 1111
As i know the mpu bcd codes is only from 0 to 9 but the 1111 is 15.

this is the code in mikroc

unsigned int bcd;

ANSELB = 0; // Configure PORTB pins as digital
TRISB0_bit = 1; // input BCD A
TRISB1_bit = 1; // input BCD B
TRISB2_bit = 1; // input BCD C
TRISB3_bit = 1; // input BCD D

do
{
bcd = PORTB & 0b00001111;
// code for display bcd value
Delay_ms(50);


} while(1);

Does anyone knows if that is correct.

Regards
Michael

[seymour.shabow]

Post by infrared pinball
After the seven flash i set the pinball mpu to first test by ground
j3 pin to ground for a moment to set the display to count from 0 to
9.
The problem is that the bcd code i get is only 0000 or 1111 As i know
the mpu bcd codes is only from 0 to 9 but the 1111 is 15.
Does anyone knows if that is correct.

If it's a stern mpu100 rom in there, the first test is lamps, not
displays. If it's an mpu200 rom, the first test would be a burn in test
which would walk the display.

1111/F=blank, which is what the first test on mpu100 firmware would show

Are you trying to capture the scoring for something like a scorbit or
recording of scores? You will need to connect up the digit enables as
well to sort things out.

[infrared pinball]

Post by seymour.shabow

Post by infrared pinball
After the seven flash i set the pinball mpu to first test by ground
j3 pin to ground for a moment to set the display to count from 0 to
9.
The problem is that the bcd code i get is only 0000 or 1111 As i know
the mpu bcd codes is only from 0 to 9 but the 1111 is 15.
Does anyone knows if that is correct.

If it's a stern mpu100 rom in there, the first test is lamps, not
displays. If it's an mpu200 rom, the first test would be a burn in test
which would walk the display.
1111/F=blank, which is what the first test on mpu100 firmware would show
Are you trying to capture the scoring for something like a scorbit or
recording of scores? You will need to connect up the digit enables as
well to sort things out.

The Mpu is Stern 200.
I am trying to capture the display signal to show to lcd for my bench testing. The connections of bcd, digit enables and strobes are connected already to the pic.
I just want first only read the bcd for test at the beginning and then write the complete code.
It is surprises me that the bcd code includes the value 1111

Thanks

[seymour.shabow]

Post by infrared pinball
It is surprises me that the bcd code includes the value 1111

That's the decoder chip on the display to indicate all segments off (blank)

There might be residual voltage otherwise if you just rely on the
blanking causing some segments to ghost

[[e-mail]]

Post by infrared pinball
The Mpu is Stern 200.
I am trying to capture the display signal to show to lcd for my bench testing. The connections of bcd, digit enables and strobes are connected already to the pic.
I just want first only read the bcd for test at the beginning and then write the complete code.
It is surprises me that the bcd code includes the value 1111

This project may do what you want. I built up a couple and they seem to work well. I had a single display for bench testing but that needed a jumper set for what display you wanted to view. The one on the LISY site shows them all at once:

https://lisy.dev/bally-lcd-display.html

[marlon markland]

https://pinballsarcadegames.com/product/ac-dc-pro-pinball-machine-by-stern/

http://pinballsarcadegames.com/

phone number....2105705281


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phone number....2105705281

[John Robertson]

https://pinballsa...

Spammers do realize that folks learn to ignore certain companies and
even boycott them if particularly annoying? And tell their friends who
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John :-#(#

[Jeremy Fleitz]

Post by John Robertson

https://pinballsa...

Spammers do realize that folks learn to ignore certain companies and
even boycott them if particularly annoying? And tell their friends who
tell their friends, and so on and so on...
John :-#(#

Not only that, but I fell for it and clicked on the ad thinking "really a NIB ac/dc?". Then you scroll to the bottom of the page and it says "Moving Mick target", "13 rolling stones songs". Oops! If you are going to spam, at least update both of the descriptions for what you are spamming X)

Nice to post on rgp again!
-Jeremy