2510 - 8 POSITION ADDRESS GENERATOR

The 2500, 2510, 2520 and 2560 modules perform the basic potentiometer matrix functions of early sequencers. The 2510 is an eight position (3 bit) up/down presetable, cascadable counter; the 2520 is a 4 by 8 potentiometer matrix, and the 2560 is a sequential switch.

The 2510 Address generator is at any time in one of eight position states. The lamp corresponding to this active position will be lit, and the associated position gate output will present a logical one. The binary equivalent of this position (coded 0-7 for positions 1-8) will appear at the binary outputs, the upper being the most significant bit. The binary outputs are usually patched to a 2520 voltage source.
A rising edge on the up clock input causes the active state to move right one position, while a pulse on the down clock input will result in a leftward shift. Both clock inputs will be ignored if a logical one is applied to the clock inhibit input. If the position is clocked up from position eight to position one, a pulse will be issued from the carry output. Similarly, clocking down from 1 to 8 will produce a borrow pulse. The carry and borrow outputs could be connected to the up and down clocks of a second 2510 for cascading.
Depressing one of the exclusive set pushbuttons will result in shifting the active position to that location regardless of other conditions. Applying a logical one to the appropriate pulse set input will similarly result in exclusively setting that position.