TEST1 pin on ARM 7

I am having trouble with an ARM7TDMI (actually an NXP LH75401) using an Amontek tiny interface.

With the test1 pin HIGH I can identify the processor correctly, but I can’t access the ICE.

With test1 LOW, I can’t identify the processor, but the ICE seems to work.

What SHOULD I do with TEST1?

Can anybody help?

Thanks,

Chris.