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IC17 Pin 1 not making sense
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IC17 Pin 1 not making sense

by monsterhippie on Tue Nov 12, 2019 4:58 pm

Pin 1 on both IC16, 17, and 18 are sending out what looks like serial data, a bunch of 1s and 0s whenever a switch is pressed that connects into IC16 and IC18. But whenever I press a switch connected to IC17s inputs, there is nothing coming out of Pin 1 of either. Since they all do the same thing, I would imagine that all the buttons would make pin 1 output something. It is normally high, but when I button that connects to IC16 or 18 is pressed, it becomes serial. Except for IC17... any thoughts?
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Re: IC17 Pin 1 not making sense

by monsterhippie on Tue Nov 12, 2019 4:58 pm

The photo is an example of what I was getting on all three pin 1s for IC16,17,18 when I pressed S17.

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Re: IC17 Pin 1 not making sense

by Nordcore on Tue Nov 19, 2019 5:28 pm

Pin 1 is Shift/Latch input to the switches.

The serialized data stream is on IC18-pin9. Clock is on pin2.
One Clock pulse for each input read in.

One pin1 pulse for each 24 clock pulses (=one complete keyboard read).


If you are using MarOS: In "Computer Control" Mode there is a keyboard/LED test. Press a key and the assigned LED will go on.
(Step LEDs set by BANK switch. )
Might help to see better what is happening/working/not working.

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Re: IC17 Pin 1 not making sense

by monsterhippie on Thu Nov 21, 2019 4:05 pm

Something super odd just came up, S21 switch is causing pin 12 to go high while S22 is cuasing pin 13 to go high. This should not be the case... S21 is conneted to pin 14 and S22 is conneted to pin 12 according to the xoxbox build manual....

Nordcore wrote:Pin 1 is Shift/Latch input to the switches.

The serialized data stream is on IC18-pin9. Clock is on pin2.
One Clock pulse for each input read in.

One pin1 pulse for each 24 clock pulses (=one complete keyboard read).


If you are using MarOS: In "Computer Control" Mode there is a keyboard/LED test. Press a key and the assigned LED will go on.
(Step LEDs set by BANK switch. )
Might help to see better what is happening/working/not working.

monsterhippie
 
Posts: 5
Joined: Tue Nov 12, 2019 4:45 pm

Re: IC17 Pin 1 not making sense

by monsterhippie on Thu Nov 21, 2019 4:43 pm

and s18 is giving high to the input where s17 is supposed to....This doesn't make sense. Has the build manual been updated?

monsterhippie
 
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Re: IC17 Pin 1 not making sense

by Nordcore on Fri Nov 22, 2019 5:41 pm

Seems like some confusion with the schematics.
Long time ago I cleared it up a little bit, as I didn't like the overlaps between nets and designators (...).
So may be this is a little better readable...

Switches.png
Switches.png (91.21 KiB) Viewed 364 times


From the actual wiring this is the same as http://wiki.openmusiclabs.com/wiki/x0xb ... board2.png

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