Denial

Interesting! That is still unusual, isn't it? I'm not aware of any other cartridge using that kind of setup.

Did the author of the other Boulder Dash version simply ignore potential licensing issues?

On that picture I can see a 8kB RAM chip, as well as an EPROM. I don't know any other cartridge that has an RAM and ROM chip on board, apart from the Super Expander, which adds 3kB. I think the ROM can only be 8kB large. So the game only needs 8+3.5kB of RAM? Why does the Youtube video say the disk ...

I'm succesfully using this mod with my Sony PVM monitors and the pictures is perfect, it couldn't be any better.
I recently got a Commodore 1084S-D1 monitor but with it I only get an extremely distorted picture, it looks like a sync issue.
Any idea what the reason for that could be?

I think this is absolutely amazing.
It doesn't even look and feel like a VIC-20 game.
Congratulations and thank you very much. It's a 10/10 from me.

Is there a machine language library somewhere?
I feel like having to reinvent the wheel time and time, or ask people on this forum for help, when the code snippet I need probably does exist somewhere...

Thank you, Rob, your routine works great too.
It moves my little character all the way across the screen as well, so I need to see if I can get the de-bounce routine from above to work.

I've found a routine which I've disassembled like this: LDA $911F EOR #$FF AND #$3C LDX #$7F SEI STX $9122 LDY $9120 BMI jump ORA #$02 jump LDX #$FF STX $9122 CLI LSR A STA $90 $90 holds direction: up: 2 down: 4 left: 8 right: 1 fire: 16 down-left: 12 up-left: 10 up-right: 3 down-right: 5 It seems t...

I can't seem to find the CA65 to download anywhere, would be so kind an point me in the right direction?

I see, so do you think
JOY_PORT_READ_MASK = JOY_PORT_UP OR JOY_PORT_DOWN OR JOY_PORT_LEFT OR JOY_PORT_FIRE

would do the same thing in CBM Studio?

It also doesn't like this line:
and #<(~JOY_PORT_FIRE)

Thanks, I'll try to work through it.
Just out of interest, if this line
JOY_PORT_READ_MASK = JOY_PORT_UP|JOY_PORT_DOWN|JOY_PORT_LEFT|JOY_PORT_FIRE
defines a variable, what does it actually define?

PS: It might be easier if you tell me which crossassembler you're using, and I can check it out myself.

Thank you for your help! The FORTH implementation doesn't seem to offer me any help, unfortunately. Beamrider, your routine looks good, but there are bits in there which I and CBM prg Studio don't understand, subsequently it throws some errors. Would you be kind enough to let me know what various li...

Hello everybody, I'm trying to get into VIC-20 assembly programming and wanted to find a joystick routine. It's surprisingly diffcult to find one! Eventually I did find one on here: joy_dir = $F7 joy1 = $911F joy2 = $9120 LDA #$7F STA $9122 ;set DDR for input LDA joy1 AND #$3C STA joy_dir LDA joy2 A...

Ahh what a pity. It's a great convert, but it's running just that extra bit too fast to be enjoyable.

Does anyone know where I can get a Dig Dug PAL version for the VIC from? I have the NTSC version, but on my PAL VIC it runs way too fast.