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        ;; *******************************************************************
        ;; Test UPI41 read and write.
        ;; *******************************************************************

        INCLUDE "cpu.inc"
        INCLUDE "pass_fail.inc"
        INCLUDE "upi41_opcodes.inc"

        ORG     0

        ;; Start of test

        ;; test IBF empty
        ujnibf  ibfempty
        jmp     fail

ibfempty:
        ;; test OBF empty
        ujobf   fail

        ;; signal test start
        anl     P1, #~004H

        ;; request echo test
        mov     a, #001H
        uout    dbb, a

        ;; read input as data
inp1:   ujnibf  inp1
        jf1     fail

        uin     a, dbb

        ;; invert and output
        cpl     a
        uout    dbb, a

out1:   ujobf   out1

        ;; read next input as command
inp2:   ujnibf  inp2
        jf1     inp2_2
        jmp     fail

inp2_2: uin     a, dbb
        xrl     a, #001H
        jz      pass


fail:   FAIL

pass:   PASS