The tables go now from rune to rune, not from scancode to rune.
This means that the tables are smaller. They are inside /sys/src/cmd/usb/hid/map.c
For example, this is the ukkbmap now:

Rmap ukkbmap[] = {
	{L'"',	L'@'},	// 0x0022 -> 0x0040
	{L'#',	L'£'},	// 0x0023 -> 0x00a3
	{L'α',	L'\\'},	// 0x0000 -> 0x005c
	{L'β',	L'|'},	// 0x0000 -> 0x007c
	{L'γ',	L'¬'},	// 0x0000 -> 0x00ac
	{L'@',	L'"'},	// 0x0040 -> 0x0022
	{L'\\',	L'#'},	// 0x005c -> 0x0023
	{L'|',	L'~'},	// 0x007c -> 0x007e
	{L'~',	L'¬'},	// 0x007e -> 0x00ac
	{0,	0},
};

You have a xxkbmap[] per keyboard type. Also, you may have a xxaltkbmap[] if
you happen to have AltGr.

The two arrays maps[] and altmaps[] in the same file (map.c) glue all the tables
together.