Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!garnett
From: garnett@cs.utexas.edu (John William Garnett)
Newsgroups: comp.sys.next
Subject: Re: Shouldn't 70 ns SIMMs work with '040?? (they don't for me, anyway)
Message-ID: <1517@dimebox.cs.utexas.edu>
Date: 5 Jun 91 15:30:15 GMT
References: <1429@actisb.UUCP> <CNH5730.91Jun1131807@maraba.tamu.edu>
Organization: University of Texas at Austin
Lines: 33

In article <CNH5730.91Jun1131807@maraba.tamu.edu> cnh5730@maraba.tamu.edu (Charles Herrick) writes:
>In article <1429@actisb.UUCP> federico@actisb.UUCP (Federico Heinz) writes:
>   The SIMMs that don't work are 1MBx9, 70 ns, and I'm attempting to use
>   them together wih the original 1MBx8 SIMMs that came with the Cube.
>   I'm puzzled.
>
>You can not mix (1X9) SIMMS with (1X8) SIMMS on a NeXT, even if
>parity-checking is disabled. Replace your 70ns (1X9) with 70ns (1X8)
>and try again.
>
>Pascal, could this go into the FAQ, please?
>
>-- Chuck

Please double check that.

From the FAQ:

]I2. What type of memory may be installed in a NeXT?
]
]  and the hard drive in simultaneously.  Note that parity (9-bit)
]  RAMS can be used in both the 030 NeXT and the 040 NeXT.  Parity
]  and non-parity SIMMS can be mixed in both the 030 and the 040
]  (however, the boot on 040 boxes will generate a warning).  Only
]  the 040 NeXT can use the parity memory to detect parity errors
]  (parity and non-parity may not be mixed if you wish to have
]  parity errors detected). 2.2 (v63) ROM lets you disable parity 
]  checking (NVRAM preference).  2.1 (v59) does not.
-- 
John Garnett
                              University of Texas at Austin
garnett@cs.utexas.edu         Department of Computer Science
                              Austin, Texas