Duh; sorry, I saw the M100 references and didn't notice that we're talking about a 102.
My 102 is similar to the 24K M100, with three soldered chips (3 x Sony CXK5864PN-15L) and one Mitsubishi M5M5165P-12L (M6) in a socket. Don't know what the history of yours is, but I'd actually suspect M6 (or the decode circuit); I think a bad M9 would keep the computer from working since part of it is used for system variables and memory is actually counted from the top down. Good luck! The stylized F is Fujitsu's logo: https://www.westfloridacomponents.com/manufacturer-logos.html m ----- Original Message ----- From: Josh Malone To: Model 100 Discussion Sent: Monday, July 04, 2016 8:03 PM Subject: Re: [M100] 32k M102 suddenly showing 24k 20160704_192827.jpg 20160704_193204.jpg 20160703_204651.jpgWell - on closer inspection, they are *all* soldered, but I'm not sure that they were soldered at the factory. The left-most chip was clearly done by hand -- although I suppose it might still have come from the store that way. The left-most chip (M9) is different from the rest - it's an NEC D4464 vs the other 8464 ICs. Model is 26-3803, Serial 809001955. I'm guessing it's a later "revision" where they added the final 8k once RAM prices dropped enough to sell it fully-loaded. The uncleaned flux on the top of the board clearly looks hand-soldered to me. Do you figure this is the most likely place to start looking for a bad chip? Any reason to suspect the NEC over the other 3 chips. I don't recognize the logo (serif capital F with horizontal bars above and below). Hope the large pictures go through. :-/ -Josh On Mon, Jul 4, 2016 at 6:44 PM, Mike Stein <mhs.st...@gmail.com> wrote: *All* of them? Are you sure? Even the left-most one? I always believed that there were only two models (in NA): 26-3801, an 8K base memory version with three expansion sockets, and 26-3802, a 24K base memory version with only one expansion socket. What's your model (and serial) number? m ----- Original Message ----- From: Josh Malone To: Model 100 Discussion Sent: Monday, July 04, 2016 5:38 PM Subject: Re: [M100] 32k M102 suddenly showing 24k No, they're all soldered. I was hoping a reseat would be warranted, but alas. On Jul 4, 2016 3:39 PM, "John R. Hogerhuis" <jho...@pobox.com> wrote: If you have socketed ram chips you may need to reseat then. -- John. On Monday, July 4, 2016, Josh Malone <josh.mal...@gmail.com> wrote: Thanks. For some reason, finding the 100 cold-start procedure via Google wasn't working for me. However, the free memory hasn't changed. It's still stuck at 24k. I guess it's time to get out the scope/meter/etc. and see what's going on. Not looking forward to this and not exactly sure what to try next. BTW - shouldn't your sig take the Model 100 into account? :) -Josh On Mon, Jul 4, 2016 at 8:04 AM, Ron Lauzon <rlau...@gmail.com> wrote: Hold the reset button on the back, then press Control-Break. On Mon, Jul 4, 2016 at 7:07 AM, Josh Malone <josh.mal...@gmail.com> wrote: > What procedure should I use for a cold start? I figured the memory power > should do it. > > > On Jul 3, 2016 10:52 PM, "John R. Hogerhuis" <jho...@pobox.com> wrote: >> >> Sounds like it is crashed. Try cold starting it and see if memory is back >> to normal. The typical ways this happens is running an ML program with a bug >> or attempting to load a untokenized basic program with a BA extension. >> >> Logical operators can be used for masking and whatnot. But to shift in >> BASIC you need multiplication and division by powers of two. >> >> -- John. >> >> On Sunday, July 3, 2016, Josh Malone <josh.mal...@gmail.com> wrote: >>> >>> So, >>> >>> I was sitting down to hack on some basic code >>> (https://www.reddit.com/r/retrobattlestations/comments/4qs0f3/july_is_basic_month_the_challenge_turtle_graphics/) >>> and typed in a quick basic statement to verify that Tandy 102 basic has >>> bitwise operators (it seems to). The command was something like "print c and >>> 2" or something stupid like that. To my surprise, my 102 reset itself. All >>> my files were gone (backed up, so no real loss) but now the menu is showing >>> 21446 bytes free. Some gremlin has stolen 8k of my RAM! >>> >>> I'm so perplexed by this, I just opened up my 102 to visually verify is >>> has 32k (indeed, all 4 RAM chips installed - although 1 is a different chip >>> than the other 3). I've let the system sit for >1 hour with memory switch >>> off and power removed. No change. >>> >>> What on earth could have happened? >>> >>> Last clue I have is that I re-loaded FILSIZ.BA and when I run it, I get >>> OV error on line 9. >>> >>> Thanks for any help anyone can provide. >>> >>> -Josh -- Ron Lauzon - rlauzon at acm dot org Homepage: http://webpages.charter.net/rlauzon/ Weblog: http://ronsapartment.blogspot.com/ DNRC: Lord of All Things That Are Fattening "To be sure, conservative radio talk show hosts have a built-in audience unavailable to liberals: People driving cars to some sort of job." - Ann Coulter Microsoft Free since July 06, 2001 Running Ubuntu 16.04
