Six Channel Sound (Turbo-Sound/Turbo-Ay) - Sinclair MrX Manual

7.

Six Channel Sound (Turbo-Sound/Turbo-AY)

With a modified GAL for the MrX Sound interface, you can combine it with the ZXpand plus
ZXpand-AY module (or a second MrX sound module using the original GAL), to provide 6 channel
stereo output sound (Turbo-AY) sound on the ZX81.
REMARKS:
The modified GAL changes the port address of the MrX to the following values.
Latch
0xAF
0xBF
0xAF
0xBF
This implies that the MrX with the modified GAL is not ZON-X compatible any more!
ATTENTION:
The following instructions describe how to exchange the orignal GAL chip with the Turbo-Sound
GAL. Follow the instructions carefully and exactly. If you are not sure, engage a radio engineer or
similar to perform the exchange. In case of failures severe damage may occur to the computer and
the sound card.
Instructions:
Put the MrX sound card in front of you. On the top right hand corner you can see the GAL
•
chip, marked here with a red rectangle
Use a screwdriver or similar to lift the GAL chip out of its socket. Don't use brute force!
•
There is a gap between the chip and the socket.
Version: v005
Data
0xE7
0xF7
0xF7
0xE7
12 Date: 22.05.2012