aH!
There was a chap on here, now banned, who uploaded the contents of the EPROM.
https://www.vintage-radio.net/forum/...=112433&page=2
Datasheet states:
table 10:
XA XB CRYSTAL
0 0 two 3.6 MHz
0 1 one 3.6 MHz (pin 34)
1 0 one 4.4 MHz (pin 35)
1 1 3.6 MHz (pin 34) and 4.4 MHz
(pin 35)
So i need XA and XB to be 1 1