Subject: Re: what's this machine check mean?
To: None <firstname.lastname@example.org>
From: der Mouse <mouse@Rodents.Montreal.QC.CA>
Date: 04/15/2000 20:59:23
>>> 30->72 pin converters
>> The surface-mount ICs are 14-pin and hence have pin count enough to
>> be address buffers (data buffers are, of course, unnecessary).
> Databuffers are not unecessary, RAM chips give substantial capacitive
> loading! You have 4x the number of RAM chips compared to typical
> 72pin SIMMs.
Yes - but each *data* line is still connected to only one chip.
>> I can trace many of the etch runs on the adapter, and it certainly
>> looks as though the surface-mount chips are address buffers.
> Or address decoding.
Except there's no address decoding necessary on the adapter.
>> The bad news is, it didn't work: [...]
> Hm, I still would check what ordinary 72 pin chips do.
In what respect? In any case, it didn't work, so I won't be using
those adapters further on this machine, and I don't have any
significant amount of <=70ns 30-pin memory anyway.
>> The good news is, it apparently didn't fry anything; when I switch
>> back to the 80ns SIMMs, it works as well as it ever did
> If worst come to worst I can maybe find you a 21066/166Mc chip. Will
> have to do some digging.
It'd probably cost more to get it to me than it would for me to get one
locally. :-) Besides, I wouldn't worry about it unless the machine
checks continue once I have 70ns or better RAM in there. 80ns is close
enough I could easily believe it will mostly work at 70ns, especially
since the ECC it does can presumably recover from the occasional error.
7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B