* The NLQ401 PCB can be optionally fitted with RS232 interface (25pin DSUB connector, and 75188/75189 voltage converters, this might also require a different firmware version).
* The As seen on the photo, the board contains a [[uPD7810/uPD7811|uPD7811G]] processor, but its internal ROM is disabled via MODE0/MODE1 pins, so it does act more like a ROM-less uPD7810.According to the NLQ401 service manual either uPD7810 or uPD7811 can be used.* The 16K EPROM is mapped to address 0000h..3FFFh. The MODE0/MODE1 pins are wired so that external memory uses only 14bit addresses (the upper 2bit of Port F are used as I/O signals, rather than as address bits)
== Manuals ==