Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!rutgers!bellcore!texbell!merch!cpe!techsup!garyk From: garyk@techsup.UUCP Newsgroups: comp.sys.tandy Subject: Re: Tandy RAM upgrade Message-ID: <15400008@techsup> Date: 30 Apr 89 14:31:00 GMT References: <485@dekalb.UUCP> Lines: 42 Nf-ID: #R:dekalb.UUCP:485:techsup:15400008:000:1961 Nf-From: techsup.UUCP!garyk Apr 30 09:31:00 1989 > /* Written Apr 28, 1989 by dekalb.UUCP!greg in techsup:comp.sys.tandy */ > /* ---------- "Tandy RAM upgrade" ---------- */ > A friend wants me to upgrade his Tandy 1000 (SL?) from 384 K to 640 K. Fine. > I decided to give them a call. Here's what I learned, more or less in order: > > 3) Yet another call to Tandy - this time to their (not toll-free) > "Hot-line". Yup - I need two banks of 4464 chips. "That'd be eight > chips, total." Okay, fine. Yes, the correct answer is #3! But they all do a really nice memory test on power up!! 4464s would allow a stop at 512K if you only used 4 chips. (but that is not supported). This is ONLY true of the 1000SL, BE SURE it is a 1000SL! A quick test is 256K x 1 RAMs use 16 pin IC sockets. 64K x 4 RAMs use more pins (18 pins off the top of my head). I do not recall the acess time required, i think 120ns would be fine (if not expensive). Use the speed of the RAMs in the bank next to the empty sockets as a guide. > No parity and some kinda screwed up > RAM setup. But I can still do it for about 1/2 of tandy's price. None of the 1000 series has used parity. Screwed up is relative. I thought the 8088 was screwed up compared to the 68000. Although i am beginning to like the '386. As a note, the SL uses a 8086. > > Is some (any) of the above on track? I haven't had a chance to actually > open his machine and look, but really doubt that it uses 64x4 chips for > the main memory. Use the above & look inside if you still have questions. Also the Technical Reference manual for the computer is available from Tandy. It provides some techie info, schematics, and a parts list. > --------------------------------------------------------- > | Greg Philmon ...gatech!dekalb!greg CIS: 72261,1724 | > --------------------------------------------------------- > /* End of text from techsup:comp.sys.tandy */ Gary Kueck techsup!garyk