I'm having trouble with printing a board of dots in Commodore Basic 6502. This is what I have to far: (it's a subroutine) 10 INPUT "Please enter a number:", X 20 DIM A$(X, X) 30 FOR I = 0 TO X 40...

I'm learning assembly for the 6502 micro via a C64 emulator. Currently trying to output strings to the screen. Here is my code: processor 6502 org $1000 ldx #$00 ;using x register as column co...

I have written a short program in 6502 assembler for the Commodore 64 using the ca65 assembler and ld65 linker. The program should render a solid square sprite somewhere near the center of the disp...

I have this variable declarations on my program: X="MAGENTA" Y="CYAN" Z="TAN" A="KHAKI" Now what I want is to randomly choose one of these and PRINT it. But how to do this?

Reading this HTML page on Commodore 64 memory allocations because I am interested in old computer hardware, I stumbled across a cell in the table that claims that the memory address is unused. What...

I have this curiosity for 25 years and I would love to understand the trick. In the Commodore 64 the border was not addressable by the 6569 VIC. All you could do was to draw pixels in the central...

So, I'd like to write larger functions in Commodore 64 BASIC. So far, from what I'm seeing from other sources (such as various C64 wikis, as well as the user's manual for the C64 itself,) function ...

I am trying to learn 6510 assembly and since I am running Debian xa65 is the assembler I want to use. I have so far written a piece of code that looks like so: *=$0801 .byte $0c, $08, $0a, $00, $...

I am building a Commodore PET on an FPGA. I've implemented my own 6502 core in Kansas Lava (code is available at https://github.com/gergoerdi/mos6502-kansas-lava), and by putting enough IO around i...

I'm writing a little hobby c64 textual adventure and I've stopped in one very concrete moment. Namely, I don't know how to quote anything inside quote. How to do that inside commodore 64 basic v....

I know this question is very spesific question but I know there are some c64 code gurus around here. So, here is my question. When I try to disable screen using $d011 trick, upper/lower border als...