Path: utzoo!attcan!uunet!peregrine!elroy!ames!mailrus!tut.cis.ohio-state.edu!ucbvax!ukc.ac.UK!FTP From: FTP@ukc.ac.UK (UKC FTP Daemon) Newsgroups: comp.sys.atari.st Subject: Failure of your mail. Message-ID: <8903130151.AA20883@mcvax.cwi.nl> Date: 13 Mar 89 09:36:34 GMT Sender: daemon@ucbvax.BERKELEY.EDU Organization: The Internet Lines: 115 Your mail to uk.co.stc.idec failed when the file was transferred. The mail at this host was to be sent to the follow addresses. stuser%uucp.cel@uk.co.stc.idec This was due to an error at uk.co.stc.idec. The reason given was: File access denied The body of your mail follows. Received: from nss.cs.ucl.ac.uk by kestrel.Ukc.AC.UK via Janet (UKC CAMEL FTP) id aa28122; 12 Mar 89 4:52 GMT Received: from NSS.CS.UCL.AC.UK by NSS.Cs.Ucl.AC.UK via List-Channel id aa01947; 12 Mar 89 3:53 GMT Received: from score.stanford.edu by NSS.Cs.Ucl.AC.UK via Satnet with SMTP id aa01927; 12 Mar 89 3:49 GMT Date: Sat 11 Mar 89 12:08:26 PST Subject: Info-Atari16 Digest V89 #75 From: Info-Atari16 Digest Original-Sender: Info-Atari16-request@edu.stanford.score Errors-to: Info-Atari16-request@Score.Stanford.EDU Maint-Path: Info-Atari16-request@Score.Stanford.EDU To: Info-Atari16 Distribution List: ; Reply-to: Info-Atari16@edu.stanford.score Sender: info-atari16-request@uk.ac.ucl.cs.nss 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" 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!