Search found 53 matches

by Gunstick
Wed Nov 13, 2019 5:18 pm
Forum: 3D MODELS
Topic: STFM case remake
Replies: 198
Views: 38856

Re: STFM case remake

Hi

there is a local 3D printing shop in Luxembourg. They powder print nylon. I checked some demo pieces and it seems quite solid.
I could ask them for a quote.

Georges
by Gunstick
Tue Nov 12, 2019 6:38 pm
Forum: HARDWARE DISCUSSIONS
Topic: Put 2 YM2149 into the ST
Replies: 38
Views: 1813

Re: Put 2 YM2149 into the ST

I think the previous design does not need cutting DA4 & DA5 so the whole board could be piggybacked on the existing YM, sparing you painful unsoldering and also no pin cutting. But maybe I am wrong? I'm currently looking for simulation and pcb software for linux. Found kicad with ngspice, but did no...
by Gunstick
Mon Nov 11, 2019 11:13 pm
Forum: HARDWARE DISCUSSIONS
Topic: Put 2 YM2149 into the ST
Replies: 38
Views: 1813

Re: Put 2 YM2149 into the ST

You are a brave man. Hope it works out. In case you don't want to fiddle with that analog switch stuff, you might like my latest sketch. It has extra wires out for DA4/5 for the chips that don't need the bit reversed as well as the flipped one. I don't understand exactly this circuit. Is DA4_0 the ...
by Gunstick
Wed Nov 06, 2019 8:53 am
Forum: HARDWARE DISCUSSIONS
Topic: Put 2 YM2149 into the ST
Replies: 38
Views: 1813

Re: Put 2 YM2149 into the ST

I will get myself a couple YMs and components and cobble together something to check if it works.
by Gunstick
Tue Nov 05, 2019 7:06 am
Forum: MEMBER BLOGS
Topic: Conway's Game of Life on the Blitter
Replies: 7
Views: 1287

Re: Conway's Game of Life on the Blitter

I actually published the fast life as standalone
https://demozoo.org/productions/167685/
But it's only the bootsector, you need a program to write it
So that also exists https://demozoo.org/productions/167683/
by Gunstick
Tue Nov 05, 2019 7:00 am
Forum: HARDWARE DISCUSSIONS
Topic: Put 2 YM2149 into the ST
Replies: 38
Views: 1813

Re: Put 2 YM2149 into the ST

I had some fun, if you need to learn a new software. Quite surprised what today's online tools are able to do. So I proudly present the circuit nobody needs or wants: 16 YM2149 adaptor for AtariST. :lol: 16YM.png Here is the website, it can even simulate, on condition to use elements which are made ...
by Gunstick
Mon Nov 04, 2019 2:57 pm
Forum: HARDWARE DISCUSSIONS
Topic: Put 2 YM2149 into the ST
Replies: 38
Views: 1813

Re: Put 2 YM2149 into the ST

I think it may be possible, despite delays. The YM goes tri-state whenever there is invalid address on the high bits (i.e. different from %0000xxxx) Scenario: The 68k sets bdir & bc1 & address %0001xxxx YM0 ignores this, as address is not 0000 YM1, because of delay on the D4 line, also sees 0001, so...
by Gunstick
Sun Nov 03, 2019 3:22 pm
Forum: MEMBER BLOGS
Topic: Conway's Game of Life on the Blitter
Replies: 7
Views: 1287

Re: Conway's Game of Life on the Blitter

The bootsector is the smallest thing you can have. 512 bytes. Minus several bytes to make it a valid disk and bootable. That leaves you officially with 452 bytes available. But you can squeeze up to 484 bytes if you know exactly what TOS does with that data. Additional info: I found a more recent ve...
by Gunstick
Sat Nov 02, 2019 12:00 am
Forum: MEMBER BLOGS
Topic: Conway's Game of Life on the Blitter
Replies: 7
Views: 1287

Re: Conway's Game of Life on the Blitter

I made a life using "grafics"-operations, but with the CPU. It's nicely fast and small (it fits in a boot sector). I got that idea from someone who did life with blitter on the Amiga. As you also found out, you only need to count to 4. It is a reimplementation of an adder logic chip by using logic o...
by Gunstick
Fri Nov 01, 2019 11:25 pm
Forum: HARDWARE DISCUSSIONS
Topic: Put 2 YM2149 into the ST
Replies: 38
Views: 1813

Re: Put 2 YM2149 into the ST

As expected, the simulation is not powerful enough to make an analog switch work correctly. It keeps tri-state and active signal sticking on the same bus segment. But well, I get the idea and it should work. https://circuitverse.org/simulator/edit/34126 Circuit is simple and small. If I find for all...

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