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by Mike
Tue Aug 22, 2017 1:22 am
Forum: Programming
Topic: Raster split and $9002
Replies: 35
Views: 442

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: 45

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: 3
Views: 69

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: 53

Re: New messages?

Quick links > Active topics
by Mike
Mon Aug 21, 2017 11:28 am
Forum: Programming
Topic: Raster split and $9002
Replies: 35
Views: 442

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: 10
Views: 1823

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: 35
Views: 442

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: 35
Views: 442

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: 35
Views: 442

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: 2
Views: 54

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: 4
Views: 88

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: 35
Views: 442

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...
by Mike
Sun Aug 20, 2017 2:47 am
Forum: Programming
Topic: Raster split and $9002
Replies: 35
Views: 442

Re: Raster split and $9002

there is an extra line above the 'ADG' with some detritus in it You should look what happens if you mimic the RAM pattern of your VIC-20 on start up with VICE. Per default, VICE uses something like 64x$00 and 64x$FF which is not in any way similar to what I know from real hardware. I have changed t...
by Mike
Sat Aug 19, 2017 2:03 pm
Forum: Buy, Sell, and Trade
Topic: For sale - vc 20 - German made ntsc
Replies: 2
Views: 52

Re: For sale - vc 20 - German made ntsc

We had a similar find here in Denial roughly one year ago, in the thread 'NTSC VC20 ???'.

The consensus being, those were probably test machines or intended for purchase by US-American military personnel (who might have brought NTSC TV sets to Germany).
by Mike
Sat Aug 19, 2017 10:30 am
Forum: Programming
Topic: Raster split and $9002
Replies: 35
Views: 442

Re: Raster split and $9002

I'll only have the opportunity to test on my VIC-20 during next week.

Nonetheless, is there now a difference between VIC-20 and VICE, or did you just place the text so far in the overscan area that you just couldn't see it on real hardware with CRT?

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