Recent content by GeekDot

  1. GeekDot

    Sonnet Crescendo NuBus Revision A

    Yeah, I'm currently thinking how to "iron out" that curve. Heating up the loop-through-slot soldering might remove some more of the tension. But it might also well be the case of a general warping created during population of the board or 'unlucky' ordering of layers inside the PCB. There must...
  2. GeekDot

    Sonnet Crescendo NuBus Revision A

    Just for the roundup, I think I found the culprit. My Crescendo is warped. Just slightly, but it's doing the "banana". Looking veeeery closely, you can see the PCB bends up a tiny bit in the middle: This will result in the card not sitting totally straight in the PM6100 slot and thus some...
  3. GeekDot

    Sonnet Crescendo NuBus Revision A

    That's a very helpful information... Thanks a ton! So I guess there's something wrong with either powering or the firmware of the CPLD went the way of the Dodo. Thinking of powering the card externally, I learned that the pinout of the PMac PDS is not easy to find. Any hints on that? [Never...
  4. GeekDot

    Sonnet Crescendo NuBus Revision A

    Did so in the meantime. Cleaned with Isoprop, scrubbed with glas-pen... they shine like new now. PDS slot got a nice contact cleaner spaying... still nothing. So I pulled PM6100 #2... which is running fine with its A/V card, so that slot is physically and electronically ok (while #1 also ran...
  5. GeekDot

    Sonnet Crescendo NuBus Revision A

    Hey Gang, I had some extra hours at hand so I thought I'm doing something good to my PM6100 and replace its Sonnet Crescendo 250/256k for a 400/1M I recently 'found' on ePay. Well, no dice 😢... the extension loads but is crossed-out, i.e. did not find anything... or it's the wrong version of...
  6. GeekDot

    Found the 50MHz bus switch on Alchemy (5400/6400)

    Just saw your mentioning now... thanks for the heads-up and I'm always happy when my crap research is of any help ;)
  7. GeekDot

    Building an internal grayscale card for the SE/30

    Here's another teaser 😁... in hardware ;-) So at least a bit of acceleration.
  8. GeekDot

    Building an internal grayscale card for the SE/30

    This is correct... at the moment. The original Formac ProNitron card on which this design is based used a software controllable "switch" to change the video clock(-devider) so that it could display 1- and 8-bit. @Bolle had a hard time fiddling with this and ended up doing "8bit only" for now...
  9. GeekDot

    Building an internal grayscale card for the SE/30

    Just as an appetizer and to soothe your concerns... it's not really slowing things down. Here's the Speedometer 4.02 QuickDraw benchmark comparison to a Color Classic. ...aaaand that's at the same resolution as the Color Classic (i.e. 512×384, not 512x342) [Yes, that's a really battered...
  10. GeekDot

    Building an internal grayscale card for the SE/30

    0, 1 and every unfractioned number until infinity is an integer;-) All used in this case is the CPU and the bus. Very simple said: the CPU writes bytes over thr bus into video RAM. A digital-analog coverter creates signals for the CRT. Voila: A picture. It's simple bitmap graphics. Thr faster...
  11. GeekDot

    UMAX SuperMac C series CacheDoubler

    ...and for those who have a C500/C600 (aka Apus 2000/3000) and never had a chance or money to buy a CacheDoubler: I wrote a lengthy post how to speed it up a bit 🔥 :cool: (Mainly to document it for myself, but maybe it's of help for some of you guys)
  12. GeekDot

    Building an internal grayscale card for the SE/30

    Yes, working on it (y)
  13. GeekDot

    Alternative Classic II FPU card

    Hi gang, While Marcin Dymczyks FPU card is cool, it uses a hard-to-get and quite expensive TE Connectivity AMP Connector which is ~13€/14$ at a minimum order of 50€ at Digikey. So my design available at https://github.com/axelmuhr/MacClassic2FPU uses a simple 90° Pin-Header connector (<1€)...
  14. GeekDot

    Source for MC68882FN40A Chips

    This might be a good time to steer you to my version of this adapter over at https://github.com/axelmuhr/MacClassic2FPU It uses a standard 20-pin, sub-$1 female connector instead of that very special, hard-to-get US$15 TE Connectivity AMP Connector. Also you can use 3 different types of...
  15. GeekDot

    Building an internal grayscale card for the SE/30

    No worries. I will publish it on my github as soon we're done - or at least have something we can call V1.x Hehe... and I wasn't aware that you weren't aware. That would have saved a lot of written bytes being wasted 😅 No offence - but if you have kids, you know how "are we there yet?" feels...
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