Search found 149 matches

by Cyprian
Sat Nov 16, 2019 8:04 pm
Forum: CHAT FORUM
Topic: German forums
Replies: 8
Views: 140

Re: German forums

do you have more info about atari-home.de?

I vote yes.

The more Atari related threads, the better IMO.
by Cyprian
Thu Nov 14, 2019 5:22 pm
Forum: HARDWARE DISCUSSIONS
Topic: BLITTER RE-CREATION THOUGHTS
Replies: 282
Views: 35024

Re: BLITTER RE-CREATION THOUGHTS

Is there any known difference between the timings of this presumably newer blitter? (functionality wise I assume it's the same). regarding timings, the only known difference is Mega STE, where each blit pass takes one more bus cycle for bus mastering (cache management is suspected of that delay). r...
by Cyprian
Wed Nov 13, 2019 12:32 pm
Forum: HARDWARE DISCUSSIONS
Topic: BLITTER RE-CREATION THOUGHTS
Replies: 282
Views: 35024

Re: BLITTER RE-CREATION THOUGHTS

What did you try to do and what was the consequence of this? How did this "bug" present itself? I'm interested as I'm messing with the Blitter quiet a lot lately. Thanks, Daniel Below you can find a graphics representation of that behaviour. That screenshot is taken from real hardware. White/grey/r...
by Cyprian
Wed Nov 13, 2019 11:41 am
Forum: HARDWARE DISCUSSIONS
Topic: BLITTER RE-CREATION THOUGHTS
Replies: 282
Views: 35024

Re: BLITTER RE-CREATION THOUGHTS

On the schematics, it can be seen that the HOG counter counts the XASI signal (incoming AS when the CPU is the bus master, outgoing when the Blitter is), that's how many times the CPU/Blitter accesses the memory. Yeah, it's not implemented this way in Suska. I spent so many hours to find a bug in m...
by Cyprian
Wed Nov 13, 2019 9:40 am
Forum: HARDWARE DISCUSSIONS
Topic: BLITTER RE-CREATION THOUGHTS
Replies: 282
Views: 35024

Re: BLITTER RE-CREATION THOUGHTS

"Release the bus for 64 CLK cycles." - it uses wrong cycle split scheme I've also changed that back to 64/64. I don't know how the original performs, but my main interest is demo compatibility, which require cycle perfect operation, and it's hard to achieve without having this as a design goal from...
by Cyprian
Tue Nov 12, 2019 8:52 pm
Forum: HARDWARE DISCUSSIONS
Topic: BLITTER RE-CREATION THOUGHTS
Replies: 282
Views: 35024

Re: BLITTER RE-CREATION THOUGHTS

"Release the bus for 64 CLK cycles." - it uses wrong cycle split scheme
by Cyprian
Fri Nov 08, 2019 6:30 pm
Forum: MEMBER BLOGS
Topic: Conway's Game of Life on the Blitter
Replies: 7
Views: 1279

Re: Conway's Game of Life on the Blitter

AFAIK the Amiga blitter can combine 2 (or maybe even 3) sources into a single destination, the Atari blitter can only combine a single source with a single destination, overwriting the destination in the process. I'm sure it can be done though. actually Atari BLiTTER can combine three sources: 1) S...
by Cyprian
Fri Nov 01, 2019 10:38 pm
Forum: SOFTWARE
Topic: Notator.
Replies: 14
Views: 306

Re: Notator.

Congrats Cosmic Puppet, it seems you've just found a new bug.

Let me report that issue to EmuTOS Team
by Cyprian
Thu Oct 31, 2019 8:25 pm
Forum: HARDWARE DISCUSSIONS
Topic: Put 2 YM2149 into the ST
Replies: 38
Views: 1812

Re: Put 2 YM2149 into the ST

Hmm does the SND_CS output depend on the LDS abd UDS signals from the CPU? If not, could these be combined with SND_CS to put the second YM chip on the odd byte of the same address (Wen LDS is active). So the address map would become: Address size chip function $FF8800 byte Primary YM Read data/Reg...
by Cyprian
Mon Oct 28, 2019 11:51 am
Forum: SOFTWARE
Topic: Wanting to try MultiTos
Replies: 15
Views: 252

Re: Wanting to try MultiTos

AES is a key part of TOS - Atari operating system

Check a slide 8:

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