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Ethernet
The Q68 ethernet port uses a RJ45 8-pin connector (tab down). It has automatic polarity detection and
correction. The 10 Base-T ethernet port is fully compatible with 100/1000 BASE-T networks.
Pin
Signal
1
TX+
2
TX-
3
RX+
6
RX-
4,5,7,8
Not connected
Serial Port
A serial port is provided on a PC standard male 9 pin SubD connector. It uses RS-232 compatible trans-
ceivers capable of up to 460 kBaud in hardware. Software support was tested up to 115200 Baud.
Please note that the Q68 does not use the original QL SER1 / SER2 pinout. The hardware delivers serial
mouse power supply. The Q68 operates at a 7 or 8 bit rate. There is no parity nor hardware handshake.
Pin
Description
2
Receive Data (RxD) Input
3
Transmit Date (TxD) Output
4
Data Terminal Ready (DTR)
Internally pulled up for serial mouse
5
Ground
7
Request To Send (RTS)
Internally pulled up for serial mouse
VGA
VGA graphics output is provided by a PC standard 15 pin HDsub VGA connector.
Output signals are optimized for flatscreen monitors or HDMI converters which support 1024x768 VESA
standard input at 60 Hz vertical refresh rate.
Analogue cathode ray tube (CRT) monitors with at least 48 kHz horizontal frequency can also be atta-
ched, but may show some flicker. This is due to the relatively low vertical refresh rate, which allows higher
video signal quality in connection with digital monitors.
Some HDMI monitors might be connected to this with a suitable VGA/HDMI converter.
Pin
Description
1
Red
2
Green
3
Blue
11
Monitor ID Bit 0
13
Horizontal Sync
14
Vertical Sync
5,6,7,8,10
Ground
CPU Cycle Timer
The unsigned longword register at $1C060 contains a high resolution timer in 25 ns units, equivalent to 40
MHz CPU clock cycles. It rolls over from 2
lues are directly subtracted with a longword instruction, the time difference is always correct, as long it is
shorter than 107.3 seconds.
32
-1 to 0 about every 107.3 seconds. However, if two timer va-
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