6502.org

djmips

Well looky here!

https://github.com/Retrotink/Micro-KIM/tree/main

djmips

Here is another attempt. Runs in about 11820 megacycles.
Developed in FORTH on a 65816 in native mode. The calculation routines are 8-bit internally to simulate a 6502.

Very nice. But not quite 6502 from 1977. Looks more like 65c02 with PLX etc. I'm sure it could easily be fixed up for 1977 and I ...

djmips

Visual Studio Code (VSC) for me too. And I use GIT for source control. VSC has good support for GIT and you can install GITLens for even better support.

And I use keyboard shortcuts for common operations. VSC has a command line as well which is useful. Just hit F1 and it brings up a command line ...

djmips

Pardon for bringing up this old thread but I wanted to pay my respects. Lee was always very generous, knowledgeable and encouraging in our emails and I very much improved myself from his sharing with some random netizen. It's sad that he's gone so young. Thanks Lee.

David

djmips

I like your thinking. I also like the idea of having multiple zp banks with some of them I/O and RAM. When you talk about the vintage 6502 designs it came to mind that the C64 6510 had a couple of I/O registers at $00 and $01. Another more striking example is the Atari 2600 which mapped all of it's ...

djmips

And if you haven't seen it, this was recently posted.

http://www.righto.com/2012/12/the-6502-overflow-flag-explained.html

Note that the javascript 6502 emulator you referenced has bugs, I have examined the code and it needs to be corrected.

Ken Shirrif's blog notes that for code, you can use ...

djmips

Hello,
..am downright shocked at how much I still remember, and even more so that I forgot how much fun assembler is.

Hi! and welcome.

When I returned, for fun, to 6502 programming I was also shocked that the 6502 opcodes and programming had been burned to my 'ROM' apparently. I could still ...

djmips

Code: Select all


;;;;;;;;;;;;;;;;;;;;;
; ROL
      inp  m1
one   clr  1
      add  m1
loop  bpl  nob7
      add  one
nob7  sta  m1
      jmp  loop	

m1    ds  1

rol.zip: (194 Bytes) Downloaded 303 times

djmips

This is kind of a re-introduction since I was on the forums before and posted a little bit a few years ago but I now I'm back.

David Galloway, Canadian, now back in Canada although I spent most of adult life in the USA fist with a pilgrimage and 6 years in Silicon Valley eating donuts at the Donut ...

djmips

djmips

Check out the liba.65s example for input/output to the In/Out window. I agree that it's not the best and if it had better I/O and graphics output that would be a lot of fun.

djmips

http://home.pacbell.net/michal_k/6502.html

This is a simulator for your PC. You can write small code, it will assemble and you can step through the results.

djmips

How about a CMU course?

http://bobrost.com/nes/

I haven't looked at the lectures but it's probably good!
http://bobrost.com/nes/lectures.php

djmips

DASM

http://www.atari2600.org/DASM/

djmips

You could consider the freeware IDA

http://www.simtel.net/product.php?id=27629

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Re: What happened to Briel Computers?

Re: Asimov's Pi question - a challenge

Re: What's your preferred development environment in 2019?

Re: Lee Davison quietly passed away last year

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Re: Is this an overflow condition?

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printf and console

6502 sim for learning basics