Recent content by GeekDot

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...

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...

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...

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...

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...

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

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

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...

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...

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...

...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)

Yes, working on it (y)

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€)...

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...

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...