Search found 2810 matches

by Mike
Wed Aug 23, 2017 12:03 pm
Forum: General Topics
Topic: VIC Hunt - fcbpaint-image released at Evoke 2017
Replies: 6
Views: 193

Re: VIC Hunt - fcbpaint-image released at Evoke 2017

The picture made a good #8 out of 26 entries in the competition. :)
by Mike
Wed Aug 23, 2017 11:24 am
Forum: Emulation and Cross Development
Topic: Emulation problems with Power-20 (split from: "WIP: Arukanoido")
Replies: 8
Views: 137

Re: Emulation problems with Power-20 (split from: "WIP: Arukanoido")

Indeed, left is always set. I wonder why it works at all but Arukanoido. You should now cross check like thus: 1. replace 37137 in the test programm with 37151 to confirm (in Power-20) the joystick routine indeed works as intended with the other register, and 2. in my Games Collection , start the g...
by Mike
Wed Aug 23, 2017 1:25 am
Forum: Programming
Topic: Robo-VIC: An Android Inspired GUI
Replies: 15
Views: 332

Re: Robo-VIC: An Android Inspired GUI

The VIC-I chip has only one display mode: multi-colour text. If you want to display (parts of) the screen as bitmap, that is done by using a given arrangement of characters in the screen RAM as address generator, you then manipulate the character definitions. See here . It is though possible to sync...
by Mike
Tue Aug 22, 2017 1:22 am
Forum: Programming
Topic: Raster split and $9002
Replies: 48
Views: 813

Re: Raster split and $9002

Mike wrote:(there's still a subtle difference in VICE, it allows for 2-pixel accuracy in the horizontal register whereas real h/w only delivers 4-pixel accuracy), which was anyhow good enough to design MINISKETCH in VICE.

tokra wrote:Is there already a bug-report for this?

No... :oops:
by Mike
Tue Aug 22, 2017 1:09 am
Forum: Programming
Topic: Custom Char Set and Memory
Replies: 3
Views: 84

Re: Custom Char Set and Memory

To be exact, what the VIC-II chip 'sees' in the C64 has nothing to do with the 6510 (port) at all. What is addressed by VIC-II is selected by the PAL IC, independent on the 6510's port settings ; VIC-II only sees the C64 RAM with the exception of two mirror copies of the character ROM at $1000..$1FF...
by Mike
Mon Aug 21, 2017 2:39 pm
Forum: Games
Topic: WIP: CROSS CHASE
Replies: 7
Views: 269

Re: WIP: CROSS CHASE

Hi, Linzino, I put a screenshot into the first Announcement post, and will replace it with an improved version once that becomes available. In the meantime, please keep the discussion within this thread here. The releases threads in the Announcement section have adopted a certain structure over the ...
by Mike
Mon Aug 21, 2017 11:29 am
Forum: General Topics
Topic: New messages?
Replies: 3
Views: 92

Re: New messages?

Quick links > Active topics
by Mike
Mon Aug 21, 2017 11:28 am
Forum: Programming
Topic: Raster split and $9002
Replies: 48
Views: 813

Re: Raster split and $9002

By timing or counter instances, I assume this means modification of the screen geometry or switching character and/or screen memory? Changing the base pointer of character memory *should* work out even up to the point where the screen text byte has already been fetched. It *might* be possible, that...
by Mike
Mon Aug 21, 2017 7:12 am
Forum: Announcement Board
Topic: VIC-20 Software Releases of 2017
Replies: 13
Views: 2215

Re: VIC-20 Software Releases of 2017

Name: CROSS CHASE Author: Fabrizio Caruso Released: Aug, 20th 2017 Requirements: Any VIC-20 with at least 8K RAM-expansion (for minimal version, 16K for standard version) Screenshot: https://2.bp.blogspot.com/-6TMT46BnbqQ/WZssopvhZYI/AAAAAAAAAKA/gxI35abnVWIRcZlQFmPBToHVSRg6L7SpgCLcBGAs/s1600/Vic20....
by Mike
Mon Aug 21, 2017 3:05 am
Forum: Programming
Topic: Raster split and $9002
Replies: 48
Views: 813

Re: Raster split and $9002

The article will construct the whole topic on first principles, i.e. with the exception of four constants/parameters everything can be derived on white paper. There are two relevant constants - the timer 1 period; and the "phase" value, which is used for the interrupt delay/jitter compensa...
by Mike
Mon Aug 21, 2017 2:38 am
Forum: Programming
Topic: Raster split and $9002
Replies: 48
Views: 813

Re: Raster split and $9002

pixel wrote:Am assuming that it's about reading the low timer value [...]

Essentially, yes.

[...] and doing a bunch of 'lsr/bc*'s...

No, I'm using a much simpler clock slide instead.

My paper will be self-contained anyhow, so everything can be followed without the necessity to refer to other articles.
by Mike
Sun Aug 20, 2017 11:13 pm
Forum: Programming
Topic: Raster split and $9002
Replies: 48
Views: 813

Re: Raster split and $9002

tokra wrote:[...] I would suggest you do a follow-up-paper [...]

I'll have a go at it in the next days.
by Mike
Sun Aug 20, 2017 11:11 pm
Forum: Games
Topic: Need help finding game
Replies: 3
Views: 97

Re: Need help finding game

That could be Dragonwing.

... although - ViccyBird has very similar game mechanics. :mrgreen:
by Mike
Sun Aug 20, 2017 4:24 am
Forum: General Topics
Topic: VIC Hunt - fcbpaint-image released at Evoke 2017
Replies: 6
Views: 193

Re: VIC Hunt - fcbpaint-image released at Evoke 2017

Really nice to see the finished picture. Once again a fine release for the VIC-20 on a demo-party - even if "Freestyle Graphics" (with photographic works!) is presumably an even harder competition than "Oldstyle Graphics" on Revision. The captions might 'evoke' (pun intended) que...
by Mike
Sun Aug 20, 2017 3:39 am
Forum: Programming
Topic: Raster split and $9002
Replies: 48
Views: 813

Re: Raster split and $9002

If you PM me your e-mail address, I can also provide you with an alternative implementation for a stable raster interrupt. I don't know why Marko's 'paper' still is used as reference. His code takes *ages* to do the initial sync of the timer, with a linear search process; he uses two timers, where o...

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