allochronic
anachronic
anachronistic
anachronous
in series
nonparallel
nonsynchronous
serial
unsynchronised
unsynchronized
unsynchronous
8-bit
async
baseband
binary
client/server
cryptographic
data-link
high-performance
high-speed
industry-standard
interactive
microprocessor
outbound
outgoing
point-to-point
sequential
step-down
synchronous
text-based
two-wire
web-based