Search found 4648 matches

by Mike
Sun Mar 10, 2024 5:16 am
Forum: Programming
Topic: MINIGRAFIK lineart
Replies: 47
Views: 16785

Re: MINIGRAFIK lineart

Here's another port of Super Expander lineart to MINIGRAFIK ( download ); this time, 's Kangaroo duo Lionel and Joey: https://dateipfa.de/.Public/denial/images/minigrafik/kangaroo.png As with Garfield earlier in this thread, the drawing is primarily made from circle/ellipse arcs and lines. The MG im...
by Mike
Sun Mar 10, 2024 4:02 am
Forum: Programming
Topic: How do I redefine characters with 8k or more RAM?
Replies: 25
Views: 3262

Re: How do I redefine characters with 8k or more RAM?

I didn't understand that there was math involved in creating that number. When you did not ask about that detail, it was foreseeable to me that you would run into this issue: next logical step after redefining part of a character set would be redefining the entire character set. I did not want to l...
by Mike
Fri Mar 08, 2024 12:30 pm
Forum: Emulation and Cross Development
Topic: Assembler
Replies: 35
Views: 1442

Re: Assembler

Merytsetesh wrote:I do wish the VIC had an inline assembler.
wAx2? :wink:
by Mike
Fri Mar 08, 2024 9:59 am
Forum: Emulation and Cross Development
Topic: Assembler
Replies: 35
Views: 1442

Re: Assembler

groepaz wrote:use whatever the people you can ask use.
+1
by Mike
Fri Mar 08, 2024 2:37 am
Forum: Emulation and Cross Development
Topic: Assembler
Replies: 35
Views: 1442

Re: Assembler

As you had some exposure to the Acorn Archimedes series, and if you're adventurous, you might consider using the inline assembler of BBC BASIC, the one contained in HI BASIC (part of the !65tube emulation) in particular. :mrgreen: Otherwise, quite some people here use either dasm or ACME , so there ...
by Mike
Fri Mar 08, 2024 2:11 am
Forum: Hardware and Tech
Topic: What do I need for a NTSC to PAL conversion on a short board?
Replies: 1
Views: 301

Re: What do I need for a NTSC to PAL conversion on a short board?

You might want to take a look at this thread: VIC20 NTSC > PAL Conversion.

The OP links to a document on zimmers.net: PAL VIC20 Goes NTSC (just backwards).
by Mike
Fri Mar 08, 2024 2:03 am
Forum: Emulation and Cross Development
Topic: Reverse Engineering of JETPAC for VIC-20
Replies: 12
Views: 1359

Re: Reverse Engineering of JETPAC for VIC-20

Mike wrote:[T]hat clearly positions this thread into the "Emulation & Cross-Development" section, as it concerns the use of tools that don't run on the VIC-20 itself.
done
by Mike
Tue Mar 05, 2024 6:00 am
Forum: General Topics
Topic: ** Revision 2024 Invitation / Website
Replies: 5
Views: 960

Re: ** Revision 2024 Invitation / Website

The video of the invitation intro is online on YT: https://www.youtube.com/watch?v=fdB3Ell9F1M

Enjoy! :mrgreen:
by Mike
Tue Mar 05, 2024 3:54 am
Forum: Games
Topic: ELITE
Replies: 5
Views: 317

Re: ELITE

Hi, Meryt, [...] it's really ground my gears all my life that there's no version [of Elite] for the VIC. I understand why. The bitmapping makes it next to impossible. [...] it is not quite clear to me what led you to that false assumption. The VIC-20 is very well capable of doing bitmapped graphics!...
by Mike
Mon Mar 04, 2024 1:38 am
Forum: Programming
Topic: Screen Management
Replies: 3
Views: 295

Re: Screen Management

[...] the value of X could not be higher than the fateful 255, [...] ... yet people have managed to work with the 65xx being an 8-bit CPU all the time. Please check out my VICMON primer thread for standard idioms to address into the screen. If it's just the matter of initialising the screen content...
by Mike
Wed Feb 21, 2024 1:09 am
Forum: Hardware and Tech
Topic: VIC20 with NOS 6561 sound problem
Replies: 4
Views: 223

Re: VIC20 with NOS 6561 sound problem

Even though bigger memory expansions shift things around on the VIC-20 (notably, BASIC memory and text/colour RAM), the behaviour and position of I/O (VIC and VIA) remains unchanged. a 35K RAM expansion (which I think pages in the cart memory over the built-in SRAM unless anyone can say different) T...
by Mike
Mon Feb 19, 2024 12:08 pm
Forum: General Topics
Topic: Jeff's VIC 20 Book
Replies: 268
Views: 27850

Re: Jeff's VIC 20 Book

This is a tip: To plot the cursor on position x,y on the screen: X position is on allocation 211 decimal and Y on 214. But it doesn't work because what is needed is a print HOME and a PRINT after POKE 214,Y-1. It took me hours to find out. I found the answer in Compute!'s Gazette of december 1983. ...
by Mike
Mon Feb 19, 2024 10:53 am
Forum: Programming
Topic: Can the display window be re-triggered? (was: 9001 when read?)
Replies: 8
Views: 652

Re: Can the display window be re-triggered? (was: 9001 when read?)

heaven6502 wrote:And which demo[s] use that bus trick?
Warning by viznut/pwp, for example.
by Mike
Mon Feb 19, 2024 5:51 am
Forum: Programming
Topic: Can the display window be re-triggered? (was: 9001 when read?)
Replies: 8
Views: 652

Re: Can the display window be re-triggered? (was: 9001 when read?)

what if I do racing the beam and set $9001 later so it compares more often to $9004? As I wrote: you can't restart [the display window] after it ended by writing a corresponding higher value into $9001 ... I was always wondering how 4mat did stuff (like in C64 terms) FLD like tricks in his VIC20 in...
by Mike
Sun Feb 18, 2024 4:28 pm
Forum: Programming
Topic: "Free ZP" which ones?
Replies: 6
Views: 243

Re: "Free ZP" which ones?

Many of the new graphics modes pioneered by tokra and me routinely use the entire ZP, stack and OS workspace (i.e. $0000..$03FF) for graphics data. The only thing that necessitates the use of ZP are the two indirect-ZP address modes, and maybe the odd cycle saved with ZP (instead of ABS) operands. P...