The console is a simple device that can be used to send and receive transmissions via a communication port instead of the keyboard and screen.
The console is hard-coded to device #8, and works the same way as any of the COM devices.
# Write "A" to the console
start:
ld al, 65 # 65 = A
out 0x82, al # write to CON:SEND
ld al, 0b10 # indicate write
out 0x80, al # ...on CON:CTRL
_loop:
in al, 0x83 # wait for ACK
br z _loop # ...will be non-zero when ACK'd
brk