Yes, is 401 decimal; You you look carefully I've done a little mistake... should be 011001-0001 ( 401 ) and not as above 110010-0001 (801)
This is the format of the FR frame flag (8bits) | Address (16bits) | Data ... | FCS (16bits) | flag (8bits)
Address is: DLCI (6bits) | C/R (1bit) | EA (1bit) DLCI (4bits) | FECN (1bit) | BECN (1bit) | DE (1bit) | EA (1bit)
So, if you have DLCI 102 ( 0x66 hex, 1100110 bin ) you'll end up with something like this in the address field 000110 0110 ( DE bit and the last octet EA bit are set )
that is 0x1863. IOS will return 0x1860 'cause it apply a mask leaving only the 10bit DLCI address ( 0x1863 and 0xfcf0 )
Note that I do not think you'll go to this kind of "details" on the exam ( it is pretty meaningless )... so when you know that 102 is the DLCI and it is a 10bit address I think it suffice
I've not used any simulator personally, but sometimes I've read about Bosom Sim used by people pursuing cisco certs.