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38668a25f1
a) Added sim_debug statements, formatted console messages. b) Removed old debugging statements and redundant byte/word mask operations. c) Added more device commands. d) Added zx-200a and changed nulldev to return 0 vice 0xff. e) Added commands and corrected RTYPE and RBYTE behavior so ISIS-II would boot. f) Corrected device calls in SBC_reset, corrected get_mbyte and put_mbyte to match control bits from ipc_cont.c.