Denial

When playing tracked music there's this effect called "arpeggio" where a chord is simulated by playing the notes of the chord in very small time slices over a single sound channel. Now I was wondering if this technique could also be used to play not just chords but independent notes, so to...

Hi, I've taken the liberty of creating a slightly enhanced version of "The Hardhat Climber", the iconic type-in BASIC game by Chris Lesher. After reverse engineering it, I turned it into machine language using the Mospeed compiler, making it a little faster than the original and also imple...

I'm a bit late to this post, but yes it's the enabled equal to zero that causes the first bit shifted in the LFSR. Note that once the LFSR<>0 it never gets 0 again but loops over the 65535 values (65536 less one). Check out the following threads from where the current implementation in VICE comes fr...

look cool, must give it a try!

My compiler of choice for 6502 currently is KickC, but I'm curious to compare the two.

Albert Charpentier talks about the VIC-I chip and the VIC-20 on Dave's Garage !

https://www.youtube.com/watch?v=rs6J_PP7O7k

this thread has a picture of the max screen size tested on my old CRT TV

yes you can load an external .prg file with something like this:

https://nippur72.github.io/vic20-emu/?j ... myprog.prg

(joy=1 is used to turn joystick emulation with cursor keys, you can omit it)

The emulator now supports USB gamepads

alex.kirk wrote: ↑Tue Apr 06, 2021 4:34 pm Then I would need to run the Javascript on another website, is that possible? How to do? Is there another similar emulator?

Have you already tried https://nippur72.github.io/vic20-emu ? It has zero user interface but the emulation is quite accurate (tough not comparable to VICE).

tokra wrote: ↑Sun Apr 18, 2021 1:03 pm No, sorry, none of the 4 files in the ZIP can control the image vertically, just horizontally as the Zimmers-one.

no this is the only one I have. BTW is there a theory why Commodore cartridges did worry to allow screen alignment? Why not just use the register values in the ROM kernal?

I have this file for the cartdr... cardtr... cartridge :D which has the cursors keys thing: Jupiter Lander.zip I apprehended only recently about the interlaced vs non-interlaced mode, I realized it's the actual reason why we are able to see the scanlines, it's because we are only seeing odd frames, ...

In Jupiter Lander cartdrige manual, there is a small note: Eliminating Screen Flutter On some TV sets with automatic fine tuning your screen may "flutter" up and down when using a computer or video game. To correct this, hold down the [SHIFT] key and hit the [F7] key. (NOTE: Doing this wit...

Great document, thanks! I've always wondered why the CBM format was so redundant compared to other formats or even turbo tape. Now I have all the answers! Also very interesting the .TAP section, I recently wrote a tap<=>wav utility that I now need to match with this new information.

I think you can get a faster scroll-copy routine if you work in blocks rather than lines, e.g. 2 blocks of 253 bytes ldx #253 loop: lda 7680-1+22*1,x sta 7680-1+22*0,x lda 7680-1+253+22*1,x sta 7680-1+253+22*0,x dex bne loop (I haven't checked it, the actual numbers need to be verified)

very nice tool. I have a related issue, that is finding the right level when you playback WAV files from the PC to the real VIC (I do that via a car-cassette adapter). I find the volume level is rather critical. I was about to write a tool of my own for that purpose. My idea was to create an audio s...