Path: utzoo!attcan!utgpu!news-server.csri.toronto.edu!rutgers!cs.utexas.edu!yale!eagle.wesleyan.edu!ttensfeldt From: ttensfeldt@eagle.wesleyan.edu (Thomas Tensfeldt) Newsgroups: comp.sys.atari.st.tech Subject: Re: RAM expansions Message-ID: <1990Dec19.085247.37103@eagle.wesleyan.edu> Date: 19 Dec 90 13:52:47 GMT References: <1990Dec18.212338.1351@CSUFresno.EDU> Distribution: all Organization: Wesleyan University Computing Center Lines: 76 In article <1990Dec18.212338.1351@CSUFresno.EDU>, billm@CSUFresno.EDU (Bill Mills) writes: > Keywords:EasieST Solderless RAM > > I have gotten a hold of an ST second hand. It is a 520, with 1 meg > upgrade. The upgrade is an AERCO EasieST Solderless RAM board, and was > installed by a shop in San Lois Obispo, CA (That's what the previous > owner told me). I have none of the docs for this board. It has 32 > sockets, with 18 pins each. 16 of these sockets are populated with 32K > 150ns RAMs with 16 pins each. The extra 4 pins that are open on the > sockets all halve solder traces connected to them, so it seems likely > that this board can handle larger (18 pin DIP) chips. > > My questions: > > Does Aerco still exist, and if so, where can I get a hold of them? > Is any-thing more than plugging in 16 more 32k chips required to take my > machine to 1.5 meg? > Will using faster RAM speed up any operations that use the memory in the > card? > Can I replace the 32k chips with 64, or even 256K chips (all of which > are very inexpensive these days) to go upwards toward 4 meg? > Any help will be greatly appreciated, please respond via e-mail. > -Bill Mills > -- > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- > Disclaimer: These comments are my own, and I doubt that anyone else > would want to claim them anyhow. Bill Mills > Captain, BoBs Biz Boys paintball team Bill, I have one of those Aerco Boards. I do not know if there was more than one version of it or not. The board I have allows plugging in 16 each 41265 (150 nanosecond or faster) for 1.0 megabyte total OR 16 each TC511000P (120 nanosecond or faster) (this is an 18 pin DRAM, 1 megabit) for 2.5 megabyte. Originally I used the board to just get 1 meg. I just recently purchased 16 of the TC511000P chips and removed the 256 drams on the board and placed the new 1 megabit chips in the other bank. It worked like a charm. Eventually I would like to go to 4 megs. I know that this board claims to be able to do this. What I do not know is if it is a simple as just plugging in 16 more TC511000P chips. I have a suspicion that it is somewhat more complicated than that. Note that the 16 256K drams are in the bank furthest away from the the edge card connectors. When installing the 1 megabit rams, remove the 256 K chips and put the 1 megabit chips in the bank closest to the edge card connectors. The address for Aerco is Aerco Box 18093 Austin TX 78760 512-451-5874 I have no idea if they are still in business or not. I guess I ought to call them and see. If anyone has additional information about bringing one of these boards to 4 megs please let me know thanks... btw.. I have no affiliation with Aerco and if your machine dies when working on it, I disclaim any liability. Of course if any of this works then it is because of me. Natch... =============================================================================== Tom Tensfeldt Bitnet: TTENSFELDT%Eagle.WESLYN@Wesleyan.Bitnet Internet: TTENSFELDT@Eagle.Wesleyan.Edu 4 Laurel Avenue, Ledyard, CT 06339 (203)-464-9009 Pfizer, Inc., Box 100, Groton, CT 06340 (203)-441-4835 Chemistry Dept, Wesleyan Univ, Middletown, CT (203)-347-9411 X2635 ===============================================================================