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Date: Sat 11 Mar 89 12:08:26 PST
Subject: Info-Atari16 Digest V89 #75
From: Info-Atari16 Digest <Info-Atari16@edu.stanford.score>
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Info-Atari16 Digest   Saturday, March 11, 1989   Volume 89 : Issue 75

This weeks Editor: Bill Westfield

Today's Topics:

             1Mb RAM upgrade boards with 256kx4bit chips
                            Crippled mice
                          Re: Degas and GDOS
                         Quick Directory Size
                        Adding A Floppy Drive
                      MWC Rsconf() return value?
                         World of Atari show
            Other than Atari monochrome monitor on the ST?
       Re: Right of reply, virus- public, private- a thin line
                      need address Kevin Houser
                 Re: Atari ST Screen Dump Info Sought
                               Ethernet
                                Re: lc
               Re: Who have I clobbered? (GEM windows)

----------------------------------------------------------------------

Date: 1 Mar 89 13:03:27 GMT
From: mcvax!ukc!stl!stc!datlog!grigw@uunet.uu.net  ( Warwick Grigg )
Subject: 1Mb RAM upgrade boards with 256kx4bit chips
To: info-atari16@score.stanford.edu

I would like to upgrade my 520ST (new model) to 1Mb RAM. My ST contains
a bank of 4 256kx4bit RAM chips (NEC part number D424256C-10) with space 
for 4 more. It looks as if the decoupling capacitors are already there.
Does anyone know how to do the upgrade? Is it just a case of 
putting in the new chips ? (In sockets of course). Please mail replies
and I'll summarise. Thanks for your help.

Regards,

Warwick

------------------------------

Date: 3  Mar 89 11:09 -0100
From: "Ivan D. Reid" <ivan%rzsin.sin.ch@RELAY.CS.NET>
To:  Info-Atari16@SCORE.STANFORD.EDU
Subject: Crippled mice

	I was interested in the messages last week about mice "dying", because
one of our rodents started exhibiting the same behaviour (only moving horizon-
tally & not vertically) the day before.  The messages suggested to me that the
cause is the loss of pulses on one of the four outputs (two for each axis), and
blocking the light-path to one of the phototransistors on the good axis
duplicated the behaviour on this channel too. 

	A little bit of investigation showed that each phototransistor is
connected between +5V and a resistor to ground; the signal developed across the
resistor is then fed to one section of an LM339 quad-comparator.  The reference
for the comparator was 0.20V, and the output should switch between 0 and 5V as
the input passes through 0.2V.  A multimeter showed that one signal from the
faulty axis was only just coming up to 0.2 while the other three were reaching
up to 0.3 to 0.4.  Obviously the circuit characteristics had changed enough
with time that the output pulses were no longer being reliably generated.  The
quick fix was just to increase the sensing resistor from 470 to 820 ohms, since
for small signals the phototransistor should develop a given current flow;
passing this through a higher resistance gives a proportionately higher
voltage. 

	I hope this info might be of use to anyone with a dying mouse and a
little bit of electronics equipment (hint: SolderWick or a SolderPuller are
highly recommended when unsoldering the resistor, as the circuit board is
easily damaged). 

		idr

------------------------------

Date: 2 Mar 89 18:01:16 GMT
From: uw-entropy!dataio!pilchuck!ssc!fyl@june.cs.washington.edu  (Phil Hughes)
Subject: Re: Degas and GDOS
To: info-atari16@score.stanford.edu

In article <4208@mtuxo.att.com>, rcd@mtuxo.att.com (XG1V6-R.DUTT) writes:
> If you have access to Genie, there is a program called DJ_DEGAS.TTP
> in the ST Software Libraries RT.

While we are on the subject, anyone seen the source code for any

**** Rest omitted - too long!