Here are some very rare PC-1500 related papers : the Sharp Technical Reports !
Sharp TR-1982-03-29 (C-701)
Sharp TR-1982-03-29 (C-703)
Sharp TR-1982-04-23 (C-704)
Sharp TR-1982-07-30 (C-708)
Sharp TR-1982-10-04 (C-711)
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