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Up-beat/Down-beat jumper:
In Up-beat counting, each jack fires after "N" number of pulses are counted on the input jack (where N is the divide-by-
number). So, after a Reset pulse, only the /1 jack will fire on the first clock pulse. On the next clock pulse, the /1 and the /2
jack will fire, then on the next pulse the /1 and /3 jacks will fire, etc... This is the default method for pcb v1.0 and v1.0.1,
unless it has been upgraded to v1.0.2 code.
In Down-counting, each jack fires when its count is 1. So all the jacks will fire after a Reset pulse, and then count up to "N",
and fire again when they start over at 1. This is called" down-beat counting" because all the jacks fire on the down-beat (first
clock pulse).
Gate/Trigger Mode jumper:
In Trigger mode, the jacks output a pulse width equal to that of the input clock (the pulse width is not multiplied or divided
proportionally to the jack's divide-by amount). This is the default method for pcb v1.0 and v1.0.1, unless it has been upgraded
to v1.0.2 code.
In Gate mode, the width of the output pulses are 50% of the total wave. For example, the /6 jack will stay ON for 3 clock
pulses, and then turn OFF for 3 clock pulses. For even numbered divisions (/2, /4, /6, /8, etc) the transitions happen on the
input clock's rising edge.
Point of interest: In Gate mode, with odd-numbered divisions, the jack will turn ON on a rising edge of the input clock, and
then will turn OFF on a falling edge. For example, the /5 jack ought to stay on for 2.5 clock pulses, meaning it should go OFF
somewhere between the rising edge of clock pulses 2 and 3. Right in between these is the falling edge of pulse number 2, so
we can safely call it 2.5!
When in Gate mode (jumper 8), the difference between Up-counting and down-counting is simply that the gates are
inverted.
Auto Reset jumpers:
Jumpers 5 and 6 select the Auto-reset point, which causes the divide counters to reset after a certain number of clock pulses.
Note that divide-by amounts which are evenly divisable by the reset amount are not affected: e.g. with an auto-reset of 16,
divide-by outputs of 2, 4, 8, 16, etc are not changed.
Also, note that the CV Reset is independant of the Auto-reset. For example, Jack 7+R could be patched into the CV Reset
with jumpers 3, 4, and 5 in. This would cause a reset every 7 clocks, plus an additional reset every 16 clocks.
There are too many combinations of Auto-reset and Max divide amounts to show all combinations!
Example: Auto-reset of 16 (Jumper 5 in, no Jumper 6), with Max Divide-by of 8 (Jumpers 3&4)
IN:
1
2
3
4
5
6
3
X
X
5
X
7
7
8
9
10
11
12 13 14 15 16
X
X
X
X
17
18 19 20 21 22 23 24
X
X
X
X
25
26 27
X
X
X
X
X
28 29 30 31 32
X
X
X
X
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