20160704_192827.jpg <https://drive.google.com/file/d/0BwcKlz5N5PLcVXkyenAxR3ZEcENHVjRSMTdsNmQ1RVlzMXZV/view?usp=drive_web> 20160704_193204.jpg <https://drive.google.com/file/d/0BwcKlz5N5PLcR1FpUkw1Mlg3ejRzQzY3cEVkaEpLQThJNmlF/view?usp=drive_web> 20160703_204651.jpg <https://drive.google.com/file/d/0BwcKlz5N5PLcd0xRczZJSjBySERSTmVRTWRiNlAta0tQd3lN/view?usp=drive_web> Well - 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 <[email protected]> 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 <[email protected]> > *To:* Model 100 Discussion <[email protected]> > *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" <[email protected]> wrote: > >> If you have socketed ram chips you may need to reseat then. >> >> -- John. >> >> On Monday, July 4, 2016, Josh Malone <[email protected]> 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 <[email protected]> wrote: >>> >>>> Hold the reset button on the back, then press Control-Break. >>>> >>>> >>>> On Mon, Jul 4, 2016 at 7:07 AM, Josh Malone <[email protected]> >>>> 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" <[email protected]> >>>> 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 <[email protected]> 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 >>>> >>> >>>
