J5 Gate out Polarity ? ie, V-Trig or S-Trig

MIDIbox SEQ
1

Is this possible to implement software wise?

I’ve got a few bits of kit that use the “Short to ground” method to trigger a note (Early Yamaha & Korg Stuff etc)

It would be cool to be able to change the polarity of the gate out, ie… normally it’s low, but when a gate is sent out, the signal goes high… On Early Korg gear, the signal is normally high, but during a gate, the signal goes low.. (A short to ground)

I’m not 100% sure that this can be done via software, but if so it would be ideal..

Failing that, I might slap a few of these (V-trig to S-Trig converters) inside my sequencer..

Regards

Mike

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2

The CV/gate code reads a byte from memory and sends it to the appropriate pins… If you find the code that handles that byte, then you can use a comf instruction to flip the bits before they are sent to the appropriate output. I’d start with seq_ext.inc :wink:

3

Yes, see http://svnmios.midibox.org/filedetails.php?repname=svn.mios&path=%2Ftrunk%2Fapps%2Fsequencers%2Fmidibox_seq_v3%2Fsrc%2Fseq_ext.inc

E.g.:

#if DEFAULT_ENABLE_J5_GATES
        movf    GATES, W, BANKED
        xorlw  0xff
        call    J5_IO_Set
#endif
[/code]


will invert all pins
[code]  
#if DEFAULT\_ENABLE\_J5\_GATES  
        movf    GATES, W, BANKED  
        xorlw  0x01  
        call    J5\_IO\_Set  
#endif

will only invert the first pin

Best Regards, Thorsten.

4

Cool, I actually understand that.. brings me back to my 6502 ASM days..

Could this possibly be implemented as a menu option in further software updates?

Regards

Mike