I have a 28X-1 on a project board the code running on it is as follows:
Disconnect
setfreq m8
sertxd("ok")
do
goto main
outputs:
high 7
if b2 = 1 then high b1 endif
if b2 = 0 then low b1
endif
main:
serrxd b0,b1,b2
'let pins = b0
'let b1 = b1
sertxd(b0,b1,b2)...