(Fixed) WP34s, unresponsive after trying to flash

[Eric Rechlin]

Yes, the newer devices can be directly connected to a USB port with the appropriate wiring, with no need for level shifting or any signal changes. This means the current 12c, 10bII+, and 15c CE. The previous 12c, previous 10bII+, 15c LE, 20b, and 30b used the old serial protocol that needed a TTL to RS-232 level shifter chip in between to be compatible with a serial connection.