Search found 4682 matches
- Sat Mar 16, 2024 3:47 am
- Forum: General Topics
- Topic: modded VIC 20 kernals?
- Replies: 14
- Views: 2287
Re: modded VIC 20 kernals?
The KERNAL is accessed through a jump table in RAM. You can change those jump points and switch out any KERNAL subroutine you want without having to replace ROMs. That is the same case with the C64, but it did not give people a reason not to produce modified KERNAL ROMs. Edit/Addition : That being ...
- Thu Mar 14, 2024 1:16 pm
- Forum: Programming
- Topic: A sample programming session in VICMON
- Replies: 32
- Views: 19284
Re: A sample programming session in VICMON
[...] why use [SBC]? If you do the sign inversion in the same context as done in BALLPING (i.e. a given zero page address as source and target), for both methods you'll arrive at (DX := $F9): ; ** using SBC: SEC LDA #$00 SBC $F9 STA $F9 7 bytes, 10 cycles ; ** using EOR #$FF and 2s-complement: CLC ...
- Thu Mar 14, 2024 3:22 am
- Forum: Programming
- Topic: A sample programming session in VICMON
- Replies: 32
- Views: 19284
Re: A sample programming session in VICMON
That would only be correct with sign-magnitude representation.Merytsetesh wrote:To get DX = -DX, why not XOR with 128 instead of using SBC?
- Wed Mar 13, 2024 11:07 am
- Forum: Programming
- Topic: MINIGRAFIK lineart
- Replies: 47
- Views: 21496
Re: MINIGRAFIK lineart
That's Denial's way of notifying someone about a post that might be of his or her interest.allenhuffman wrote:I am trying to find why I was quoted here? I don’t see a post?
- Sun Mar 10, 2024 5:16 am
- Forum: Programming
- Topic: MINIGRAFIK lineart
- Replies: 47
- Views: 21496
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...
- Sun Mar 10, 2024 4:02 am
- Forum: Programming
- Topic: How do I redefine characters with 8k or more RAM?
- Replies: 25
- Views: 5418
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...
- Fri Mar 08, 2024 12:30 pm
- Forum: Emulation and Cross Development
- Topic: Assembler
- Replies: 38
- Views: 6783
Re: Assembler
wAx2?Merytsetesh wrote:I do wish the VIC had an inline assembler.
- Fri Mar 08, 2024 9:59 am
- Forum: Emulation and Cross Development
- Topic: Assembler
- Replies: 38
- Views: 6783
Re: Assembler
+1groepaz wrote:use whatever the people you can ask use.
- Fri Mar 08, 2024 2:37 am
- Forum: Emulation and Cross Development
- Topic: Assembler
- Replies: 38
- Views: 6783
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 ...
- 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: 1506
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).
The OP links to a document on zimmers.net: PAL VIC20 Goes NTSC (just backwards).
- Fri Mar 08, 2024 2:03 am
- Forum: Emulation and Cross Development
- Topic: Reverse Engineering of JETPAC for VIC-20
- Replies: 12
- Views: 2680
Re: Reverse Engineering of JETPAC for VIC-20
doneMike 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.
- Tue Mar 05, 2024 6:00 am
- Forum: General Topics
- Topic: ** Revision 2024 Invitation / Website
- Replies: 18
- Views: 4382
Re: ** Revision 2024 Invitation / Website
The video of the invitation intro is online on YT: https://www.youtube.com/watch?v=fdB3Ell9F1M
Enjoy!
Enjoy!
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!...
- Mon Mar 04, 2024 1:38 am
- Forum: Programming
- Topic: Screen Management
- Replies: 3
- Views: 1568
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...
- Wed Feb 21, 2024 1:09 am
- Forum: Hardware and Tech
- Topic: VIC20 with NOS 6561 sound problem
- Replies: 4
- Views: 1466
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...