Jump to content


  • Content Count

  • Joined

  • Last visited

Posts posted by mg.man

  1. 2 hours ago, Bolle said:

    Nope, those files won't help you there.


    Yeah... I d/l'd and saw they were Mercury-specific... drat!


    2 hours ago, Bolle said:

    not much I can do for you without another one


    Feared that as well... I know a couple of MLA'rs have one of these... but set up for a Plus - the ones I've seen do have a chip at U4. :-(  My only hope is that it's only required in "Plus" mode... but that's likely a wild hope...


    2 hours ago, Bolle said:

    makes me wonder if you need a secondary power supply hooked up to get it to work at all.


    Yeah... I've been wondering that too... I'll see if I can do some probing...


    Thanks for the info / suggestions!

  2. 2 hours ago, Bolle said:

    The CPU is hardwired for 16MHz.


    Good to know...


    Speaking of while we're at it... I recently acquired a Gemini 030 in a sad state... it's configured for an SE, but it doesn't appear to be working... all I get when powering up is this... no "bong", no pointer... :-(




    I suspect it's because one of the GAL? chips is missing [U4, upper left] (but really have no idea)...




    Open to any suggestions or happy to send to you if you want / have time to take a look... Does the file you attached include GAL details for the Gemini?

  3. 10 hours ago, Frobozz said:

    it looks like the Mercury version


    It certainly says Mercury 030 Plus on the 'board... but the one I have is for the SE as well, and has a PDS connector.  No sign of that on this one...


    5 hours ago, Bolle said:

    This is the 16MHz Mercury indeed.


    Are you sure?  The oscillator is 20Mhz... that memory expansion does look like a later one... v1.2... How many flavors of these did they actually make?  Are there any ex-Total Systems ppl still kicking around?

  4. 12 hours ago, Trash80toHP_Mini said:

    Have you got a working SE/30 or IIsi for testing?


    Not at the moment... I'm mid-restore of an SE/30... the one this card came in had terminal battery damage. :-( I *might* have one I can borrow... stay tuned...

  5. I recently acquired a Total Systems Mercury 030 accelerator from another MLA'r... it had the default configuration and works perfectly in my SE - now SE/030! :-D


    I'd like to try it out in my Plus, which I know it supports.  However, I can't find any documentation on how to set the jumpers and connect the Mercury to my Plus logic board.  I know I'll need to solder some headers onto the 68000 (my Mercury has socket headers, so I just need pins on the 68000), and I believe I have to tap into the oscillator on the Plus logic board and possibly also 5V power...


    Does anyone out there have any documentation on this guy - or one that's been installed in a Plus that you can share photos of?


    Thanks in advance!

  6. 6 minutes ago, at0z said:

    I didn't see pin 14 connected to anything


    I think you'll find that's pin 7... assuming that chip follows TTL counter-clockwise numbering convention.


    On 11/22/2020 at 8:19 AM, mg.man said:

    I'll see if I can at least give MacTest a spin today... 


    I did try out MacTest the other day... but not on a 68k machine (all mine were out of action).  I couldn't see anything obvious about 'remote' mode, however, but I suppose that may be a vintage 68k-only thing...  I gotmy SE back up and running today, so I'll have another go with the period-correct version tomorrow or over the weekend.


    Something else... I was pointed by an acquaintance (who used to work for Apple years ago) to the following...



    He hadn't heard of that Portable version of AppleCAT, but suspected that all it did was tap into the 'diagnostic' feed...  May be worth trying to connect with MacTerminal.  Since the Portable is able to talk to the display [as evident by the Sad Mac], maybe Diagnostic Mode is available?

  7. On 11/18/2020 at 8:15 PM, ronan said:

    I think I may have tighten too much my CRT and it made that little bump


    I'm wondering if it might be down to your Mac's past life... there are actually two lengths of case screws:



    I've found in the less adulterated (perhaps Plus and later?) ones I've worked on that the 'shorter' ones are used for the CRT and for attaching the internal frame to the case front. YMMV... :-)

  8. 5 hours ago, at0z said:

    does that suggest I might be able to run the MTP Emergency floppy on my Color Classic


    In that original doc I was referring to, lower down it stated:



    So my guess is any (68k?) Mac that'll run AppleCat/MacTest (and has a modem port) should work... Obviously the Color Classic wasn't out at that time... ;-)


    I'll see if I can at least give MacTest a spin today... 

  9. I've had a few things get in the way... but hoping to have a go at bringing my Portable back to life in the coming week... I've downloaded the various MacTest options from the link above, but the document refers to a special 'combined' version... AppleCat/MacTest Portable.



    I'll have a trawl through the files from MacintoshGarden... but has anyone listening heard of this unicorn?  :-/


  10. 1 hour ago, techknight said:

    you have to boot from an SE that performs the tests on the Portable


    I've been following this... but now I'm even more interested.  I've just brought an SE back to life - complete with '030 accelerator courtesy of @Bolle - and working their way to the top of my repair queue are a couple of Portables.  One I know was working fine - but had a dead vertical row of pixels :-( - when I shelved it a few years ago... and another I acquired recently which would not boot... "Sad Mac" :-(  It'd be great if someone has that magic diskette tucked away somewhere... 

  11. On 9/8/2020 at 1:08 PM, techknight said:

    Serious cases would probably need lots of desiccant and serious baking time.

    Sounds like you've been there before....  ;-)


    Update on mine... baking Round 2 was 4 hours @ 100C.... I bumped the temp slightly since 100C is the boiling point for water (212F)...  


    Initial results were even better than Round 1... here we are right after full boot...


    PB180 - 2nd bake (1).jpg


    Unfotunately, after ~2 minutes... the darkening started... 


    PB180 - 2nd bake (2).jpg


    ...and after ~11 minutes... it was starting to really show... 


    PB180 - 2nd bake (3).jpg


    I still consider this a positive result... before any baking, the screen started to darken almost immediately, and after 10 minutes - the corners were totally black and only about 50% of the viewable area could be seen.  So this is a VAST improvement and I believe fairly positive evidence that the issue is moisture.  I've put the PB to one side for the moment... other projects call, but my plan is to do a serious Round 3 bake - probably for 8 hours or so... I may or may not bump the temp up another 10C...  I welcome any comments / feedback.... 

  12. On 11/7/2019 at 12:20 AM, haemogoblin said:

    My PB has tunnel vision, I'd be ecstatic if there was a replacement.


    On 11/7/2019 at 9:41 AM, haemogoblin said:

    I have letterbox on mine, making it practically unusable

    Have you checked out this thread? 


    I'm currently 'baking' mine a second time... noticeable improvement first time 'round... so we'll see... 





  13. Just chiming in... Glad I found this thread!...  I recently purchased a faulty (screen issues) PB180, figuring it probably needed a re-cap (which I've done on my PB100 with success...  Oh no... it had a serious case of tunnelling...  Just like @GregorHouse mentioned originally "Corners begin to dark after a few seconds and in a two minutes nearly all of the screen is dark."  I was about to go on the hunt for a new display... when I found this thread and realised I was not alone.  So... I stripped the display, pulled the panel and baked it yesterday for ~4 hours @ 90C (I'm in the UK)...   The results were encouraging... but the tunnelling started to re-appear after about 10 - 15 minutes.  Nowhere near as bad as before... but still there.  I'm currently in the middle of my 2nd 'bake'... and will report back when it's done, cooled and re-instated...   Thanks to all for the contributions to this thread!... 

  14. Resurrecting this old thread in the hope of some advice / guidance from the pros...  I have a Mac Plus which decided to go "pop" recently when I powered it up.  Inspecting the 'board shows a blown fuse and a disintegrated Q12...




    ...further inspection, also seems to indicate that the insulation on the flyback transformer is gone... 



    This happened a couple of months back... and I vaguely recall finds bits of 'something' - which may have been the fragmented insulation...  A visual inspection of the 'board doesn't show anything else amiss... it's actually pretty clean.



    From reviewing this thread... it sounds like I should also check Q11 - or should that be Q10?  The post refers to Q11, but Q10 was what's circled. :-/ It also sounds like I should check R53 / R54.  Anything else?


    Also... could the insulation-less flyback have caused the original blowout?  I plan on replacing it anyway (along with the RIFA), but curious if that could have been the cause... 


    P.S. although clean... the 'board has obviously been repaired in the past... 



    Ooo... that C18 doesn't look too healthy... adding that to the list...  

  15. Although not directly related... I have a Plus which a couple of months back went snap/pop = dead.  Inspecting the [International] AB showed that Q12 had disintegrated...




    I'm researching now and found another thread here discussing Q12 - 


    Thought it might help if you've not run across it...  Did you get yours back up and running?

  16. Just to close the loop...  Thanks to @Damian Ward for letting me test out one of my 400k drives on his (working) 512k, I can confirm that the drive is recognised and reads a MFS diskette just fine.  I also tried the drive on a Classic II (which I'd re-capped for him), but it behaved just like it did on my II and IIx.  This seems to point to that requirement for a... 

    On 7/6/2020 at 4:32 AM, techknight said:

    ...PWM signal or other special signal from the IWM that's only generated in the 128/512/Plus

    A big thanks to everyone for sharing your experience!  Now that I know I have a working drive, I can work on getting my 512k up and running!  

  • Create New...