Chapter 2: Hardware - Sinclair Q68 User Manual

Chapter 2: Hardware

Mainboard
Please make sure that the power supply is turned off before making any connections to the Q68 board.
When attaching any system components to the mainboard via the mainboard connectors, please pay at-
tention to the correct orientation. In the figure Mainboard Component Locations, the number 1 pin loca-
tions of the internal connectors Power, Extension Bus, I²C and JTAG are marked in darker grey. The
external connectors only fit if they are turned into the correct orientation.
PS/2
Keyboard
Mouse
I²C
Reset
Power
Sound
Figure: Mainboard Component Locations
Power
The supply current of the Q68 mainboard itself is only about 160 mA. Nevertheless it is recommended to
provide at least 1A for the devices that are usually attached, for example keyboard, mouse and SDHC
cards.
External Coaxial Connector
DC plug with with 2.1mm inner diameter.
Contact Description
Inner +5V stabilized power input, 1A recommended
Outer Ground
Internal Pin Header
This 3 pin header primarily allows to connect a switch between the external power plug and the Q68 inter-
nal power. In order to supply the Q68, pins 2 and 3 of this header need to be connected, using a switch,
jumper, or solder connection. It is also possible to connect the power ground on pin 1, for example to add
further internal components.
Serial
Ethernet
SDHC1
LED
VGA
JTAG
SDHC2