Atari-Forum

Here's a small mod I did this week-end to be able to play Turrican and Turrican 2 with a two buttons joystick instead of button + spacebar.

Howto: https://www.fenarinarsa.com/?p=1590

Video: https://www.youtube.com/watch?v=_OUzAK0GWkM (skip to 8:15 to see a lot of 2-buttons action)

I have some kind of tutorial in the works but one important thing to note (which I didn't know before my build) - the adapter as is requires you to remove one plastic column from the top case! This was a big no-no for me but it was already too late. So now I have my Falcon open. :-/ Perhaps I'll bu...

Hello, I got my CosmosEX a few months ago and never had a chance to try it so far. Now I have but I need some directions about the Falcon internal SCSI adapter. I got it as parts (as seen in another post above), but there's absolutely no manual to explain how to build it. I had to figure out by sear...

I think the best part in Blitter is that it can shift for free. That would be way much faster than doing that with the CPU. I know that is not much used in demos, but that seems the main goal of Blitter, to be able to perform a generic BitBlt copy. On retrospective it was probably a bit of a waste ...

- When using the Blitter, is the CPU partially / totally unavailable?' If I use the entire machine time during the frame to blit sprites or copy stuff using the Blitter, will I have any 68000 time left to do anything? The general rule is that when the blitter runs, it takes control of the bus over ...

Don't forget that on Mega STE the blitter takes 4 extra cycles to start

I think Leonard had to take this into account for "We Were@" to work correctly on Mega STE.

Wow, great! Thanks for pointing this out. The only software I knew of was screen pains. BTW I think I found why the Falcon cannot generate standard NTSC, it's related to the horizontal frequency as expected. The standard horizontal video frequencies are: PAL - 15625 Hz 15625/50 = 312.5 lines (interl...

The code generated by screens of pain works very well unless you’re doing something very wrong (obviously you need to call it from supervisor mode, for example). Well actually it doesn't work for RGB but I may have done something wrong. Unfortunately Screen Pains does not allow advanced settings, o...

fenarinarsa, Videl is very flexible. It gives you a full control of video signal and allows you to define vertical/horizontal frequency whatever you want. Yes I know, except that the vertical frequency is related to the number of scanlines, and that for me to change it I need dig into Videl's regis...

Thanks a lot for all your replies. As I said in my first message I did what you say dhedberg, and it looks like it's correctly in sync. It'as amazing that I never heard of this 49170Hz frequency before. I thought the "50kHz" of the Falcon was 50066Hz like on STE (which is not even 50066Hz) I was ref...

I'm new to the Falcon and I'm currently using the DHS framework to start doing some stuff. I use the included mp2 player but it seems it doesn't replay the file at the correct frequency. For instance when I use a 48kHz mp2 file, it's played a bit too fast (actually I can see this since I'm trying to...

Just for you to know, I tried driveimage on Win10 and it works in XP SP3 compatibility mode + run as admin. But this tool is not really good to manage a lot of files on the hard disks or transfer directories... What I discovered though is that on Linux you can use Hatari to directly access the drive...

Hi, in my case for fix the nvram nightmare was checking all the u64, contacts, i checked this check list: 64/Pin1 Power 5V U64/Pin2 not connected or not used U64/Pin3 not connected or not used U64/Pin4 AD0 <-> U31/Pin41 (...) OMG thanks a lot for the checklist, I just changed the NVRAM and my Falco...

I didn't go that far. But if you use Steem SSE's debugger you will quickly see that the code is quite easy to read and there's a lot of jump to subroutines (jsr) to pointers like jsr (a0). You can replace them with nops ($4e71) and immediately see what you disabled. That's the way I found out the te...

Okay I'm no syncscroll master like you troed or others great people, but I did a quick check of the intro with Steem SSE debug and from what I could see the foreground is indeed achieved with syncscroll (that was an easy find by modifying the colors or by tracing the hbl interrupt). Since the 4-bit ...

First of all Enchanted Lands works on plain STF so you can forget about using the blitter and changing the video address counter mid screen since it's possible only on the STE. So it's all software. During the game it obviously uses the syncscroll technique. Syncscroll is mostly used to achieve vert...

Frank your version is slightly different. I did have this NEWDESK.PRG (named TT_DESK.PRG) on my boot disk back then, I worked a lot with it on my STE with 2.5MB of RAM. Some menus looks different, for instance the preference dialog show the actual resolutions (320x200 / 640x200...) when on your vers...

TT is definitevely a beast :o cvid is not the best codec to pack this video, a better choice would be QuickTime's "animation" (which is actually delta packing). I'm quite sure on TT it would be possible to compress delta-packed frames with a dictionary-based algorithm and make a full res 256 greysha...

I just released the final version. Contains 4 versions: high 50kHz, high 12kHz, low 50kHz, low 12kHz. The 12kHz versions make really smaller files, if your HDD is a bit slow it may work better. Also seems to work better with more HDD drivers, thanks to Petari. https://fenarinarsa.com/badapple/fenari...

Yes this is because of the dithering. I did a pure black & white version in lowres, the borders are a bit sharper but not so much and we lose all the shadow/blur effects... That's why I chose to do a dithering. I used Photoshop to do the batch conversion like I did for the color version. There's ano...

Okay, here's the monochrome version. Please don't repost the link, it's a beta version. I don't have a mono monitor to test it on real hardware. If you do, please test it and tell me if it's okay, then I will do a proper release :) https://fenarinarsa.com/badapple/ba_mono.zip There is also some bugf...

You can use OBS Studio, it's the best solution so far if you don't need to record the native 50Hz display. If OBS doesn't work then a regular HDMI game capture card will work like El Gato or AverMedia (I recently tried AverMedia Live Gamer Portable 2 which works pretty well and can be used as a stan...

THANK YOU. No matter how hard I searched, I couldn't find those numbers (even here, I didn't find that thread Cyprian). And the Atari wiki has been down for years :( So if I compare the result I found by trial & error (2*50035)/60 = 1667,83 bytes/vbl to the actual numbers (2*50066)/60.03747642 = 166...

Christmas topic :) When I developped Bad Apple I found out that the STE DMA frequencies may not exactly be the ones that are in every documentation. This also applies to vertical video frequencies. Atari ST video frequencies are often described as: 50Hz (PAL) 60Hz (NTSC) 71Hz (hig-res) However it se...

Okay guess what, I replaced an IFEQ by an IFNE and now it works.

I was clearing $ffff8260 so the ST was going to lowres but as the emulators are locked into highres per setting, of course I didn't see that immediatly. -_-'