===== The Digital Sequencer =====
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The sequencer made up of 2 primary sections, the MicroProcessor and the IO system of the sequencer.  

==== The Microprocessor and EPROM ====
==== Input Section ====
=== Switches ===
The input from the switches are sent to the 3 74hc165 ICs (IC16, IC17 and IC18) which are parallel to serial converters.  The serial data is sent to the MicroProcessor via the SPL_OUT line.  The output from IC16 is daisy chained to IC17, which is daisy chained to IC18.

^     IC 17     |^      IC 18        |^     IC 16    ||
^Switch^Function ^Switch^Function     ^Switch^Function|
|   6 | Prev |   5 | Next     |  14 | Done  | 
|   7 | C#   |  15 | Run/Stop |  21 | G |
|   8 | D#   |  16 | Chain    |  22 | A |
|   9 | F#   |  17 | C        |  23 | B |
|  10 | G#   |  18 | D        |  24 | C |
|  11 | A#   |  19 | E        |  25 | Rest |
|  12 | Down |  20 | F        |  26 | Accent |
|  13 | Up   | (tempo switch)||  27 | Stop |


=== Tempo ===

=== Rotary Switches ===
 




==== LEDs (Output Section) ====

The LEDs are controled by Serial input into 5 74hc595 ICs (IC4, IC5, IC6, IC7 and IC8) which are serial to parallel converters.  They are daisychained like so: IC4 -> IC5 -> IC7 -> IC6 -> 1C8.

**Note:** The LEDs and resisitors need to be linked up to their respective ICs, however, it is difficult to descern which goes where from the schematic.

^ LED ^ Resistor ^ - ^ LED ^ Resistor ^
|1|234|-|21|246|
|2|237|-|22|248|
|3|241|-|23|249|
|4|242|-|24|258|
|5|243|-|25|265|
|6|244|-|26|264|
|7|250|-|27|203|
|8|251|-|28|229|
|9|252|-|29|228|
|10|253|-|30|227|
|11|256|-|31|223|
|12|260|-|32|222|
|13|261|-|33|221|
|14|262|-|34|217|
|15|266|-|35|215|
|16|267|-|36|213|
|17|268|-|37|211|
|18|238|-|38|208|
|19|239|-|39|205|
|20|245|-|40|204|

Thanks to Maxtim for providing these values

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