6502
msbasic
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6502
- Minimal bare-metal RISC-V project
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Running Apple 1 software on a breadboard computer (Wozmon) [video]
The Apple 1 ROM is quite a tight piece of coding. Just 256 bytes which implements basic console IO, and memory editing in hex. And still two bytes left over.
One version with lots of comments: https://github.com/jefftranter/6502/blob/master/asm/wozmon/w...
You can see a classic assembly language space optimizing trick at PRBYTE. It first prints the upper half of the byte in hex with call to the PRHEX procedure, then falls through to PRHEX again to print the second half. Two entry points to a common routine.
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KIM-Venture -- adventure game based on Colossal Cave written for KIM-1 computer (source code available)
The First Book of KIM programs
- It's quite BASIC
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Playing Cosmic Conquest, a old-style real-time strategy game, on my breadboard 6502
For a command line program I started out with getting WOZMON working and then began adding more capabilities similar to the Apple II system of old. I got tired of adding one-off functionality and discovered Forth when looking at programming languages suited for systems with limited resources. Look into TaliForth2 to get up and running fast on your 6502. The full program requires 24k ROM but can be slimmed down to fit in 16k pretty easily. I was inspired so I wrote my own Forth 2012 Standard version over the summer.
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Hey anyone tried to write an assembler for the 6502?
Jeff Tranter has a github with a ton of stuff 6502, including a mini assembler. Many others out there as well.
msbasic
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The Case of the Missing 4th Commodore Basic Variable (and the 5th Byte)
I wouldn't really put the blame for this on Commodore. The integer code for BASIC-65 is common across all the platforms that licensed it from Microsoft.
You might be interested in checking this out: https://github.com/mist64/msbasic
- I hit 20MHz tonight. Pretty stoked...
- Fizzbuzz in 6502 Assembly (code in comment)
What are some alternatives?
Cosmic-Conquest-1982 - (Historic) Resurrecting one of the first real time strategy (RTS) games from 1982. Written in Forth.
6502-Tiny-BASIC - A Tiny BASIC interpreter for the 6502
hbc-56 - Homebrew 6502 on a backplane computer
py65 - Emulate 6502-based microcomputer systems in Python
NES-dev - A simple NES game written in 6502 assembly
sixty5o2 - Micro Kernel / Bootloader for Ben Eater's 6502 Computer
TaliForth2 - A Subroutine Threaded Code (STC) ANS-like Forth for the 65c02
risc-v_assembly_1 - risc-v assembly code outputting squares of integers by by Bruce Hoult
Cosmic-Conquest - An enhanced version of the 1982 real-time strategy game Cosmic Conquest
RC6502-Apple-1-Replica - An expandable SBC-version of the Apple 1 computer, easy to get started with and lot of cool stuff that can be added to it!
riscv-hello-uart - Minimal bare-metal RISC-V assembly code with UART output for execution in QEMU