Resistors for the ST 1MEG upgrade

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2 total messages Started by franco Thu, 09 Jan 1986 13:32

#2015

Author: franco
Date: Thu, 09 Jan 1986 13:32

17 lines
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Regarding the 1MEG upgrade of the 520ST, the European 1040ST is simply a
piggybacked 520ST but there are no resistors in the RAS and CAS lines and
they seem to be reasonably reliable even with TOS in ROM (according to my
source).  So why do Americans need the resistors?  One theory: some, but
perhaps not all, of the upgraders have damaged their DRAMs in some way when
installing them and the resistors allow these DRAMs to function or prevent
further damage.

Further note: it has been said that the critical period for 1MEG upgrades
is between 3-5 months after the change (if anything will happen it usually
will happen then - assuming, of course, that the modification was successful
initally).  So, if you made the upgrade without the resistors and have not 
gone back to put the resistors in (perhaps because everything is fine with 
your system) and it has not been 5 months since you did the upgrade it might 
be wise to go back and do so.  Adding the resistors shouldn't hurt performance
of the ST and may prevent you from damaging your DRAMs later.

Re: Resistors for the ST 1MEG upgrade

#2108

Author: uh
Date: Thu, 16 Jan 1986 13:21

11 lines
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I have not seen any 520ST+ (1040ST without disk drive) here with TOS in
ROM. The reason for this is, that the German language is much more
redundant than the English language. So the German TOS is always a
little bit bigger than the US version. Why have those cracks at ATARI
not put the desktop resources into a file, in order to load this
from disk when booting?

     Uwe Hoch
     Computer Science Department, University of Dortmund
     4600 Dortmund 50, P.O. Box 500500, W.-Germany
     E-mail address UUCP: ...seismo!unido!uh

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