









Arco Electronics Technical Advisory     #07    July 16, 1992


Please Address All Inquiries to Itzik Levy
	       Phone:   (305) 926-2688
			Fax  :  (305) 925-2889

Arco Product(s) :       AC-1070 and AC-1075

Environment             :       IBM PS/2 8580-041 and 8580-071
				with IBM expanded memory

Description             :       Memory protect mode in an IBM PS/2
Model 80-16MHz

				 With only one exception, the Arco AC-1070 
				 and AC-1075 will not operate in an IBM PS/2 
				 Model 80-16MHz computer running in memory 
				 protect mode.  Memory protect is required 
				 when running Windows, OS/2 and Novell 386.

				 This problem occurs with all memory boards 
				 manufactured by all companies with the 
				 exception of the IBM PS/2 Enhanced 80386 
				 Memory Expansion Option.  In the case when 
				 an IBM PS/2 Enhanced 80386 Memory Expansion 
				 Option is used, it must be set to 
				 "matched memory cycles" disabled. 

Solution                :       When installing an AC-1070 or AC-1075 in an 
				IBM PS/2 Model 80-16MHz computer, an IBM PS/2 
				Enhanced 80386 Memory Expansion Option with 
				"matched memory cycles" disabled must be used.
