It's fun that this talks about an address as "777302". That doesn't look like an address to slightly-more-modern eyes like mine. It's probably octal, where 7 is like 0xf in hex.
So, converting it to hex gives 0x3fec2, which is 318 bytes from the top of the first 256 KB (256 * 1024 is 0x40000), and thus sounds likely as a peripheral I/O address.
Yeah, octal was the convention on PDP-11 UNIX(TM). As I recall it wasn't until the move to 32 bit computers like the 68000 and no doubt the VAX preceding it that UNIX moved to hexadecimal.
So, converting it to hex gives 0x3fec2, which is 318 bytes from the top of the first 256 KB (256 * 1024 is 0x40000), and thus sounds likely as a peripheral I/O address.