63
4.24.1 REEL interface – Starpoint and Gamesman
The REEL5 control board drives each of the machine reels via a red 15-way REEL connector
as shown in Fig 32. The connector has a keyway at pin position 9.
When the MPU6 processor requires a reel to change position it transmits data to the REEL5
control board via the Barbus serial link. The REEL5 CPU produces a 4-bit pattern of pulses
from the relevant parallel port, these pulses are amplified by current drivers and are output to
the reel motor to drive the reel to the required position.
The diodes in the motor drive lines protect the drivers from back EMF generated by the
motor windings when the machine is switched off.
Driver
4
4
REEL5 board
+12V
DRIVERS
To 2nd reel
14
15
10
11
12
13
REEL
Sil 15 -
way
REEL assembly
From
cpu
port
Fig. 32 Typical REEL interface for one reel