Search found 12 matches

by zerkman
Sun Oct 11, 2020 8:01 am
Forum: Others
Topic: Building an Atari ST
Replies: 6
Views: 550

Re: Building an Atari ST

Cyprian wrote: Sat Oct 10, 2020 3:49 pm nice one,
will it be cycle exact?
I’m trying to get as close as cycle exact as possible. All the project is centered around ijor’s fx68k cycle-exact 68000 core. Also the GLUE timings are based on troed’s scanlines description, in colour modes. For monochrome mode I based the timings from a book.
by zerkman
Sun Oct 11, 2020 7:56 am
Forum: Others
Topic: Building an Atari ST
Replies: 6
Views: 550

Re: Building an Atari ST

What is simple today, wasn't that simple in the 80's. For example, using D-type flip-flops everywhere could use a lot of transistors. You can find the schematics of the STe chipset recovered by @zietz, also @ijor posted some schematics of the shifter. They're far from being intuitively designed (by...
by zerkman
Sat Oct 10, 2020 8:03 am
Forum: Others
Topic: Building an Atari ST
Replies: 6
Views: 550

Building an Atari ST

Hi, I am currently working on implementing an Atari ST on a FPGA board. I know it is not the first project of this kind, but it is mostly for me to familiarize and improve my skills in FPGA development. I am starting a series of articles on this project, and I will talk about both FPGAs and the inte...
by zerkman
Tue Nov 12, 2019 4:03 am
Forum: News & Announcements
Topic: FX68K Cycle accurate 68000 core
Replies: 56
Views: 27043

Re: FX68K Cycle accurate 68000 core

This is explained on "fx68k.txt". There is also an example at the end main source file. Please check them and if you still have any questions do lets us know. Many thanks for your quick reply ! Stupid me ! I assumed the only operating instructions would be in the readme file. Now I know what to do ...
by zerkman
Tue Nov 12, 2019 12:59 am
Forum: News & Announcements
Topic: FX68K Cycle accurate 68000 core
Replies: 56
Views: 27043

Re: FX68K Cycle accurate 68000 core

Thank you ijor for sharing this core !

I’m new to hardware coding and I am experimenting a bit on this fx68k core. I am wondering, how to properly set up the enPhi1 and enPhi2 input signals which are not present on the original MC68000 chip. Can you provide any hints please ?
by zerkman
Thu Dec 05, 2013 9:04 pm
Forum: Coding
Topic: PhotoChrome v6
Replies: 166
Views: 68572

Re: PhotoChrome v6

Hi, this looks really good. Great work Doug !
by zerkman
Sat Oct 13, 2012 7:32 am
Forum: Discussion
Topic: Amazing graphics
Replies: 4
Views: 19532

Re: Amazing graphics

Hello, Thanks for the positive comments on that demo, this means a lot ! All the graphics in this demo were made by Mic of Dune. The first slideshow features pictures which were done using Neochrome Master, using the multiple palette functionality. The second one uses a technique similar to Cyg's , ...
by zerkman
Fri Mar 30, 2012 9:52 pm
Forum: Hatari
Topic: Non-working STE overscan
Replies: 10
Views: 4113

Re: Non-working STE overscan

Thank you Nicolas, I confirm it works now.
by zerkman
Sun Mar 25, 2012 8:18 pm
Forum: Hatari
Topic: Non-working STE overscan
Replies: 10
Views: 4113

Re: Non-working STE overscan

the tested version is 1.6.1.
by zerkman
Wed Mar 21, 2012 8:49 am
Forum: Hatari
Topic: Non-working STE overscan
Replies: 10
Views: 4113

Re: Non-working STE overscan

I tested on both Hatari and Steem. The problem is the same on both emulators.
by zerkman
Wed Mar 21, 2012 8:31 am
Forum: Hatari
Topic: Non-working STE overscan
Replies: 10
Views: 4113

Non-working STE overscan

GREETS1.zip Hey guys, I'm working on some horizontal overscan for a STE effect. I have a routine that does work on several STE's I tested, but it does not on emulators. It basically consists in horizontal overscan with pixel-wise horizontal hardware scrolling. It works when the value in $ff8265 is ...

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