Recent content by Ubik

That's a great idea! If you ever get down to SoCal there is a big community who would love to see it here.

Welcome to the dark side. It's a lot of fun to to run the NeXus :) of OS X.

The annual VCFSoCal - https://www.vcfsocal.com/ has buying and selling opportunities.

This is a theory, but I think this may provide a clue on why the System 7 Memory Cache increases performance of the Gemini II, and it's the higher 768k that really drives up the video performance. Like the IIsi, the board uses its onboard RAM for video. In the case of the Gemini it's the ROM...

Hi @JDW! Thanks for the exciting news on the WarpSE. The WarpSE looks like a fantastic and very balanced accelerator! Your are right, there will be a big difference between 3 and 4 CPU results in Speedometer 3. I can't wait until the WarpSE is ready for sale! Regarding the Speedometer...

Thanks @nekogahora280. I will try a 36Mhz clock. BlueSCSI v2 does not do well on SE benchmarking. The disk seems fast when using the Mac, but I'm going to flash the latest BlueSCSI V2 firmware to see if this may help benchmarks. On the memory I ordered 9 chip 4MB 30 pin 70ns SIMMS, which...

The story continues here . . . https://tinkerdifferent.com/threads/total-systems-gemini-ii-accelerator-for-the-se.4538/

I love making the lowly SE faster, since that was my first computer back in the late 80s and early 90's, and accelerator boards were an economical upgrade path compared to the $4,000+ dollars for a loaded SE/30 from the college bookstore. So I am always on the lookout for cool SE accelerators...

@nekogahora280 - Thank you so much! I'm still waiting for delivery, although it has cleared US customs, so now I am waiting for the US Postal Service. I think Japan Post is faster, than US Post. :-) These pages provide a lot of clues about the memory settings. I have attached a PDF...

Late to the party, but welcome @Performaguy!

Yes @nekogahora280 I purchased your Gemini II. I will be honored to take good care of it, and I will post my benchmarks and photos :) In the meantime, I hope the Gemini 020/030 comes back to life somehow. I may try this board in my spare SE.

A sad update. I tried to update the 32Mhz crystal with first a 50mhz one and then a 40Mhz one with no luck. The SE would not boot. I went back to the 32Mhz crystal and all was good. (I should have stopped there). Then I got an idea to try to remove the on board RAM and try the faster...

Very cool! Fascinating to see the evolution of the board. That was about the time I purchased my SE for college. I recall when I went shopping for accelerators that the Geminis went for a premium. I guess now I know why.

Hey Jeff, after I got the board I poured over your post on 68KMLA! Amazing design. The amount of engineering effort and investment was significant. It was that rare time when upgrading the SE, Plus and 512 was a the main focus of the burgeoning accelerator industry. I’d love to know the...

FYI - I created a related post - Accelerating an Accelerator - Total Systems Gemini 020 to 030 for Macintosh SE