sync.txt
Written by Daniel Kahlin <daniel@kahlin.net>
$Id: sync.txt,v 1.1 2004/10/03 19:14:57 tlr Exp $

NOTE: (*) marks a feature that is not yet implemented!

##########################################################################
  SYNCHRONIZATION
##########################################################################

##########################################################################
  HARDWARE
##########################################################################

Sync24/Sync48/DIN-Sync
----------------------

Connector, all voltages are 5v.

Pin 1 Start/Stop 
Pin 2 GND
Pin 3 Clock
Pin 4 Reset/Start (*)
Pin 5 Fillin/Continue (*)
(*) Not used with vic-tracker.

The DIN-Sync Start/Stop line is high when it wishes to send out a "Start"
and low when it wishes to send out a "Stop".  The actual start or stop
does not happen until the next clock occurs.
Clocks come in at 24 ppqn (48 ppqn for Korg equipment).

Interface 1
-----------
This interface is the simplest (just a cable), but works only together
with VIC-20 computers.

VIC-20                         SYNC24, DINSYNC

GND        (A)  <----------->  GND        (2)

CB1        (B)  <---+--------  Clock      (3)
                    |
PB0        (C)  <---+

PB5        (J)  <------------  Start/Stop (1)


Interface 2 (*)
---------------
This interface is able to work with both VIC-20 and C64 computers.

VIC-20/C64                        SYNC24, DINSYNC

GND        (A)  <-------------->  GND        (2)
                        /| IC1b
CB1/FLAG2* (B)  <---+--o |------  Clock      (3)
                    |   \|
PB0/PB0    (C)  <---+
                        /| IC1a
PB5/PB5    (J)  <------o |------  Start/Stop (1)
                        \|

MIDI Clock (*)
--------------
MIDI Start
MIDI Continue
MIDI Stop
MIDI Clock            (24 ppqn)
Song Pointer position (resolution of 6 ticks)

# eof