20 lines
231 B
Plaintext
20 lines
231 B
Plaintext
rcsr = 177560
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rbuf = 177562
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xcsr = 177564
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xbuf = 177566
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.psect .txt
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.title echo
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start:
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mov #40,r3
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tstb @#rcsr
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bge start
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mov @#rbuf,r1
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cmpb r1,#40
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ble noxor
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xor r3,r1
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noxor: mov r1,@#xbuf
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br start
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.byte 123
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.end start
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