EIM #,(nn) has 8 bit address

[harbaum]

Instruction EIM#,(nn) opcode $75 has a single byte address operand and not a 16 bit one. This makes the Atari ST IKBD rom fail. Since it reads one byte too much in:

fec9	7e f1 b7	jmp f1b7
fecc	75 80 89	eim 8089
fecf	3b		rti

which causes it to skip the rti.

The EIM instruction can be fixed by using the same design as AIM and OIM which are correct.

I have fixed this in https://github.com/harbaum/ikbd