Denial

It seems to me it had smooth movements, unlike a basic program. Even the demons that drop from the top of the screen and leave more obstacles behind, had smooth movements. Of course I was young and these were the first computers I ever experienced, so who knows if I'm describing it accurately or not...

Back around 1984, my neighbor had a game on tape for the unexpanded VIC, that was like Centipede. It had great playability and used the keyboard for control. At the time, I was new to Commodore computers and didn't know how easy it was to copy the game. It was an all machine language game, because I...

it sounds to me like either a bad Basic ROM or a bad 74LS138 decoder.

I have found a pencil eraser will clean up the copper on the circuit board of the keyboard. The contacts on the buttons, I use cotton swabs with rubbing alcohol.

One option I haven't seen yet is to reduce the size of your bitmap screen size, or text screen size, so you can have more space for your code. setbit lda #$cc ;screen matrix set to $1000, character data set to $1000 sta $9005 lda #15 ;15 columns (120 pixels wide) sta $9002 lda #17 ;8 rows of 8 x 16 ...

One option I haven't seen yet is to reduce the size of your bitmap screen size, or text screen size, so you can have more space for your code. setbit lda #$cc ;screen matrix set to $1000, character data set to $1000 sta $9005 lda #15 ;15 columns (120 pixels wide) sta $9002 lda #17 ;8 rows of 8 x 16 ...

That is cool, Mike. You must be a math wiz as well as a programming wiz. This is the kind of stuff that I find interesting and would like to learn more about. Can you tell me anything about your code?

Well the BBCode doesn't tell me how to attach a file and when I try to it says "invalid program extension". So I guess if you would like to check this out, email me and I'll send you the project files.

Just something I pulled from C=Hacking and adapted to the VIC 20, using CBM Prg Studio. Try it out. If I can figure out how to attach the project files. LOL.