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by Mike
Fri Nov 10, 2017 12:55 pm
Forum: Programming
Topic: MINIGRAFIK lineart
Replies: 9
Views: 161

Re: Re: MG lineart - Castles

For exactly those scenarios: either a member of the audience possibly doesn't know about MINIGRAFIK at all or does not know what it is supposed to do and how to use it , or a client program is working and the programmer wants to automatise the 'start-up procedure' of MG for a release, I have provide...
by Mike
Wed Nov 08, 2017 11:14 am
Forum: Programming
Topic: Cart Image Confusion
Replies: 5
Views: 114

Re: Cart Image Confusion

BTW, there's nothing "secret" about the A0CBM signature, as it's usually called.
by Mike
Mon Nov 06, 2017 3:50 pm
Forum: Collecting and History
Topic: One VIC-20 Release for Zoo 2017 ...
Replies: 5
Views: 208

One VIC-20 Release for Zoo 2017 ...

... Zodiac Vitro by Triad:

screen.png

The demo features some nice rasterbars, a plasma, credits, greetings - and a tune that curiously reminds me of "The Last V8" on the C64 (just heavily de-tuned). :mrgreen:

Download (unexpanded, PAL only) below as found on pouët.net:
by Mike
Sun Nov 05, 2017 5:47 am
Forum: Hardware and Tech
Topic: VIC-2000 Expander. Modern Power Using Retro Parts!
Replies: 96
Views: 1770

Re: VIC-2000 Expander. Modern Power Using Retro Parts!

You could inflate the display buffer though to contain the whole signal including the SYNC pulses and keep the complicated arithmetic out of the display loop. Heck, even a ZX81 managed to output video by just using the CPU and a parallel-to-serial-converter in the SCL ULA chip. ;)
by Mike
Sat Nov 04, 2017 3:11 pm
Forum: Programming
Topic: ?FORMULA TOO COMPLEX
Replies: 8
Views: 235

Re: ?FORMULA TOO COMPLEX

Thank you for the hint - here's a working link:

https://cid-05ef0a8eae2a4f4a.onedrive.live.com/self.aspx/.Public/denial/games/victoria.zip

I'll also repair the link in the OP and the announcement thread. :)
by Mike
Sat Nov 04, 2017 1:06 pm
Forum: Programming
Topic: ?FORMULA TOO COMPLEX
Replies: 8
Views: 235

Re: ?FORMULA TOO COMPLEX

That's fair enough. Just two things I'd like to point out: 1. Ideally, an implementation of "MID$()=" shouldn't need any more temporary stack space than necessary for the RHS expression. The exchange of the string content LHS can operate in-place. 2. GC, as bad as it's implemented in BASIC...
by Mike
Sat Nov 04, 2017 1:04 am
Forum: Hardware and Tech
Topic: 6561 Die Shot Reversing Explorations
Replies: 50
Views: 763

Re: 6561 Die Shot Reversing Explorations

What if we extended Kakemoms question to the other three colours? They all come from control registers. Has anyone tried changing those mid character? I'm guessing someone has. Has been done, yes, and works ... In the die shot, they look like they're read from the control registers on every pixel. ...
by Mike
Fri Nov 03, 2017 11:46 am
Forum: Hardware and Tech
Topic: 6561 Die Shot Reversing Explorations
Replies: 50
Views: 763

Re: 6561 Die Shot Reversing Explorations

I can't remember if its possible to change a character halfway through it, e.g. changing the color byte. Obviously the Character RAM won't be fetched twice as there is no time for it, but the color RAM could. Anyone knows (or has experimented) around this? I have experimented with this and don't th...
by Mike
Fri Nov 03, 2017 11:37 am
Forum: Programming
Topic: Load VIC-20 Tape Images
Replies: 13
Views: 1215

Re: Load VIC-20 Tape Images

Anyway, I read the other thread...typical Mike stuff. Just swat everyone's ideas down and say they aren't the best way, because it isn't your way. Then claim that posting about retro ideas in a retro forum is annoying. hahaha. In fact, there in that thread died, possibly, a cool idea in the making ...
by Mike
Thu Nov 02, 2017 9:44 am
Forum: Hardware and Tech
Topic: VIC-2000 Expander. Modern Power Using Retro Parts!
Replies: 96
Views: 1770

Re: VIC-2000 Expander. Modern Power Using Retro Parts!

Something like... "hey, did you know you can create a new yellow hue by sending 2 bits really fast at pixel location 112?" ... yeah, those kind of analog quirks will not be part of my new system, only digital quirks I can do in VGA. Don't worry. The VIC-I's pixel clock is a little bit too...
by Mike
Thu Nov 02, 2017 5:21 am
Forum: Programming
Topic: ?FORMULA TOO COMPLEX
Replies: 8
Views: 235

Re: ?FORMULA TOO COMPLEX

why a stack of only three strings deep? [...] What is the thought behind that? That setup is probably sufficient for most non-trivial string expressions. For example, even something like A$=LEFT$(LEFT$(A$,M-1)+LEFT$(B$,N)+MID$(A$,M+LEN(LEFT$(B$,N))),LEN(A$)) works and gives the same result as the l...
by Mike
Wed Nov 01, 2017 5:10 pm
Forum: Hardware and Tech
Topic: 6561 Die Shot Reversing Explorations
Replies: 50
Views: 763

Re: 6561 Die Shot Reversing Explorations

http://sleepingelephant.com/ipw-web/bulletin/bb/viewtopic.php?t=7629&start=39 :shock: This would explain why display starts again in the last displayed line when YPOS=0! That "last" line continues from the current text offset, but then the text offset must get reset to the start durin...
by Mike
Wed Nov 01, 2017 4:04 pm
Forum: Hardware and Tech
Topic: 6561 Die Shot Reversing Explorations
Replies: 50
Views: 763

Re: 6561 Die Shot Reversing Explorations

I recall it being mentioned in the forums here in years gone by that the visual artefact observed in the border area immediately before the first column was the VIC chip fetching the data required for the first column, caused by some sort of interference within the chip. Am I remembering correctly?...
by Mike
Wed Nov 01, 2017 11:46 am
Forum: Hardware and Tech
Topic: VIC-2000 Expander. Modern Power Using Retro Parts!
Replies: 96
Views: 1770

Re: VIC-2000 Expander. Modern Power Using Retro Parts!

I can't imagine a scenario where [changing the ROM character generator] would hurt compatibility. There actually exist quite a few programs that show unexpected behaviour when the contents of the character ROM are changed from the default. For example, the game Astro Nell generates level data from ...
by Mike
Wed Nov 01, 2017 11:36 am
Forum: Programming
Topic: MINIGRAFIK batch processing suite
Replies: 47
Views: 16636

Re: MINIGRAFIK batch processing suite

These days I had some fun porting a nice demonstration graphic from a C16/C116/+4 BASIC tutorial over to MINIGRAFIK. :mrgreen: saturn.zip 10 GOTO28 11 : 12 X=0:Y=B:S=B*B:T=A*A*(2*Y-1):U=2*B*B:V=2*A*A:E=0 13 X1=MX+X:Y1=MY+Y:P1=X1>=0ANDX1<80:P2=Y1>=0ANDY1<192 14 X2=MX-X:Y2=MY-Y:P3=X2>=0ANDX2<80:P4=Y2>...

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