// Determine ISO keyboard by handler id
// http://lxr.free-electrons.com/source/drivers/macintosh/adbhid.c?v=4.4#L815
- uint16_t handler_id = adb_host_talk(ADB_ADDR_KEYBOARD, ADB_REG_3);
+ uint8_t handler_id = (uint8_t) adb_host_talk(ADB_ADDR_KEYBOARD, ADB_REG_3);
switch (handler_id) {
case 0x04: case 0x05: case 0x07: case 0x09: case 0x0D:
case 0x11: case 0x14: case 0x19: case 0x1D: case 0xC1: