The Eternal Doorman

See  https://github.com/jmarlin/6502tor See also TrackZero Working on (Wire Wrapping!) an NES Development Card . Why the NES ? Well, over 60 million of them were sold by Ninetendo between 1983 and 1995, ... and they all use the Ricoh 2A03  which is essentially a 6502, ... Subscribe to TrackZero .

See the first three parts here: TrackZero's 6502tor Videos and the NES Development Card, ... See the W65C02S datasheet at:  https://www.westerndesigncenter.com/wdc/documentation/w65c02s.pdf  and the Masswerk instruction reference at:  https://www.masswerk.at/6502/6502_instruction_set.html . This is programming from scratch: there is no software at all on this machine when it starts. You have to input all the programs using a hard-wired logic circuit, which allows the RAM of the machine to be loaded from mechanical switches. See Mitsuru Yamada - Floating Point Arithmetic on a Homemade 6502 Computer  for some idea of how far you can take this "bare metal programming". Subscribe to TrackZero .

Subscribe to The Money GPS . Try to find a way to make to make money out of your passion, in case your day job goes south, ... See  https://eternaldoorman.blogspot.com/2023/02/trackzero-6502tor-4-executing-your.htmlTrackZero 6502tor #4 - Executing Your First Instruction  and  David Quintieri Talking With Nobody Studios Founders . Subscribe to TrackZero . See  https://maa.cam.ac.uk/whats_on/exhibitions/colour-art-science-and-power .

Subscribe to Ben Eater . Now he can hook up a VT220 terminal, like Matt Desmarais did, ... Subscribe to Matt The Maker . See also  TrackZero's 6502tor Videos and the NES Development Card, ...

This is really, really interesting tech! Modern microcontrollers are so fast that you can use them as memory emulators running at full (retro) hardware speeds. See  US$4 Raspberry Pi Pico Emulating US$99.99 Nintendo NES (1987) ,  TrackZero's 6502tor Videos and the NES Development Card, ...  and  TrackZero Working on an NES Development Card . Subscribe to Gary Explains . Here's someone who took the emulation programming very seriously and is able to happily emulate RAM/ROM for a 6502 running at 8 MHz and leave a lot of the RP Pico's resources free for other stuff. See the full playlist:  Subscribe to Rumbledethumps .

34:42 Interesting comment about software development! See  Ladyada - RP2040 Boards . See TrackZero Working on an NES Development Card , TrackZero 6502tor #4 - Executing Your First Instruction  and  Josh's Channel - The Power of Abstraction . Subscribe to TrackZero  and join "the 0.1% of people who actually care about this stuff".

This is a variation starting from Ben Eater's SAP-1. See also  TrackZero's 6502tor Videos and the NES Development Card, ... Subscribe to Dr Matt Regan . Here's Ben's original series:

The Apple I monitor was 248 bytes, this port of Ben's comes out at 250 bytes, ... By comparison, "Hello, World" on a modern 64 bit Linux system is 15,900 bytes, ...  Here's the full playlist for the breadboard 6502 computer: Subscribe to Ben Eater . Here's a 1992 interview with Steve Wozniak. At 45:00 he talks about writing the BASIC interpreter for the 6502 processor and the costs of timeshare machines: Subscribe to  Тарас Бережницький . See  Jeri Ellsworth Takes A Call From Some Guy Who Says He Works at Apple . See also these posts  mentioning the 6502tor. The same guy built a cartridge board for a Nintendo NES that turns it into a PC that can boot from a serial port, ...  Subscribe to Track Zero . If you want to hack on 6502 code try this which is an assembler and processor emulator that runs in your web browser window:  https://skilldrick.github.io/easy6502/#intro