Ich bin ein Amiga?

Got your own fav 6502 tutorial video you would recommend to those new to the ways of the 8bit wonder?

youtu.be/yEiNs7pKNh8

In the fine tradition of capitalism, now that someone has shown weakness I can push my book - you know, if you want a retro book that isn’t written by someone pandering to the right mixam.co.uk/print-on-dem...

Do mighty trees grow

New blog post. Something a little different, a look at the wonderful 74HC74 (and 74LS74, 74HCT74 etc.) and some of the many and varied things you can do with it.
blog.tynemouthsoftware.co.uk/2025/10/the-...
It all started when I had this brilliant idea.......

Fortran is for scientists. Real programmers use 6502 Assembly.

#programming #shitpost

Compute Magazine vol 1 issue 1 from 1979 (before they excitedly changed the name to Compute! for vol 2) - focused mainly on good ol' 6502 machines.

Part 2 on the optimization of the Quicktake 150 decoder, focusing on the 6502 assembly, is out. It is more low-level than the first one, but I tried to comment the examples and explain as best as I could […]

KIM-1 Demo

youtu.be/z_9Ariaou-0

The 6502 had no multiply or divide instruction. Developers faked it with loops, shifts, and a lot of cleverness.

Interesting..

Happy 50th anniversary to the MOS 6502! Could Microchess for the KIM-1 be the first commercially available game for the 6502? The yellow booklet of the left is version 1.0. You typed it in yourself but there was an optional cassette. Let me know your thoughts. #vintagecomputer #retrocomputer

It had been gnawing at me for a couple of years: For an emulated 6502 with 256 opcodes, is an array of functions faster or slower than a big switch statement? I figured the difference would be tiny. I was not prepared for identical performance. I guess the C# optimizer is pretty good.

What a great day to try some 6502 on your phone!

apps.apple.com/app/id154835...

Was there a Rockwell KIM-1? A myth or? Yes and no.
There is a KIM-1 by Rockwell in 1977.
No, it is a MOS Technology KIM-1 PCB.
Rockwell added documents with Rockwell title pages and contents 99% MOS Technology.
The Rockwell KIM-1 is just an OEM product!
retro.hansotten.nl/6502-sbc/kim...

You will never be satisfied! :)

New KIM-1 (for me, it is from 1976), a Rev B
Nice addition to the first edition and the Rev A.

It does not. It has registers instead (haha).

Optimizing a 6502 image decoder, from 70 minutes to 1 minute
https://www.colino.net/wordpress/en/archives/2025/09/28/optimizing-a-6502-image-decoder-from-70-minutes-to-1-minute/

https://news.ycombinator.com/item?id=45412022

Can I tempt you with a little sample of Ben Eater's breadboard 6502 computer?

Anyone know how to decode Texas Instruments date codes?

The one of the left is the standard old school 5th week 1980, but the ones on the right I don't understand. You might think 24 was a year, but I have seen all sorts of numbers there, so I don't think it is.

2022 4th month? or 2nd month 2024?

New blog post in which I give myself a lot of work combining Z80 code from several sources to build the enhanced Forth ROM for the Minstrel 4th.
blog.tynemouthsoftware.co.uk/2025/09/revi...
An even more extra work by choosing to do it using an archaic assembler that I happen to like.

2. Save and Restore A Without Affecting Flags
PHA
... ; Do stuff
PLA
Unlike LDA or STA, this doesn’t affect the status flags.
Good for temporarily using A for other tasks.

1. Clear A Register (Accumulator) with EOR

EOR #$00

Equivalent to LDA #$00, but slightly faster if A is already in use.
Good when you want to zero A but preserve flags.