Path: utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!uunet!samsung!think.com!yale!cs.yale.edu!cs.yale.edu!fischer-michael From: fischer-michael@cs.yale.edu (Michael Fischer) Newsgroups: comp.sys.atari.st.tech Subject: Re: ROM sockets in a Mega ST 2 Message-ID: <1991May1.164924.24105@cs.yale.edu> Date: 1 May 91 16:49:24 GMT References: <1991Apr29.083447.27132@bernina.ethz.ch> Sender: news@cs.yale.edu (Usenet News) Organization: Yale University Computer Science Dept., New Haven, CT 06520-2158 Lines: 21 Originator: fischer@ginkgo.CS.Yale.Edu Nntp-Posting-Host: ginkgo.theory.cs.yale.edu In article <1991Apr29.083447.27132@bernina.ethz.ch> felner@nessie.cs.id.ethz.ch (Tomas Felner) writes: >I want to upgrade a friend's Mega ST 2 from Blitter TOS to TOS 1.4. I have >never opened a Mega ST myself before, but I know that there are motherboards >for 2 ROM chips and others for 6 ROM chips (as in the old 520s). Last night >I opened his machine and I found 6 28-pin ROM sockets, labelled LO-0 to LO-2 >and HI-0 to HI-2. But there are only two ROMs in the sockets labelled LO-0 >and HI-0 !?!? I am confused, but I proceed and put 6 27256 EPROMS with TOS >1.4 in those 6 sockets. I boot, the screen turns white, the floppy light >flashes and the machine reboots and reboots and reboots ... When I replied to your posting, I didn't notice that you were talking about "EPROMS with TOS 1.4". I know that Atari distributed early copies of TOS 1.4 on EPROMS but later switched to ordinary ROMS. I do not know if TOS 1.4 is legally available any more on EPROMS, but if the EPROMS that you have are not legal copies, then I do not condone what you are doing. -- ================================================== | Michael Fischer | ==================================================