User manual

Page 23
Document No. 80-15151 Issue 6 HEBER LTD
connected to a digit drive output, DIG0-15, on connector P5. Each digit drive output can drive two 7
Segment Digits, the segment anodes for one connecting to drive SEG0-7 and the other to SEG8-15.
By convention, segment “a” would connect to SEG0 or SEG8.
Alternatively, 14 segment starburst digits can be used, in which case each digit output would drive one
digit and the 14 segment anodes should each be connected to one of the segment drive lines, SEG0-
13.
The LED Digit drive circuitry shares the same Current Sink transistors as the Lamp Column drives.
Thus, if the system is being driven in a 1/8 duty cycle to allow a 36V Lamp Supply, only Digit drive
lines DIG0-7 are active (or the board is a Pluto 5 128/16). In this case only 16 Seven Segment LED
digits may be driven from the controller.
6.12 Using the Multiplex Expansion Connector
The outputs on P11 are all CMOS signals swinging between GND and +12V. These signals may be
connected to Pluto 5 Multiplex Expansion Boards to increase the Lamp and/or LED drive capability of
the system.
See the PLUTO 5 MULTIPLEX EXPANSION BOARD USER MANUAL for details of connection and
operation.
6.13 Adding Video Capabilities
A Calypso 16 Video Card is available from Heber Ltd. which plugs directly onto the Pluto 5 board via
the 2 DIN41612 connectors P14 and P15.
See the CALYPSO 16 USER MANUAL for details.
The Calypso 16 Video Card supersedes the Pluto 5 CGA/VGA Video Card. For further information on
the Pluto 5 CGA/VGA Video Card refer to the PLUTO 5 CGA/VGA BOARD USER MANUAL.