a2d
6502
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a2d
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Apple II Desktop Updated – Version 1.2 Alpha 48
FTA: “Improve appearance of ()^ glyphs in system font”
The commit (https://github.com/a2stuff/a2d/commit/c14e14f51af3b055c1e60c...) says
Fonts: Improve ()^ glyphs
- Disassembly of Apple II DeskTop a “Finder”-Like GUI for 8-Bit Apples
- Using Applesoft floating point accumulator (FAC) math subroutines, but without Applesoft
6502
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Atari Has Launched Collectible Arcade Circuit Boards of Retro Classics
For a younger, student electrical engineer, they could easily gain the appreciation for the engineering that went into these things. Especially as a someone who wrote a lot software prior to completing my EE training, I wanted to learn on something that was fairly “pure” to learn major concept and patters on: a large MCU that only breaks out into a bunch of connectors is not it.
I would love to be able to teach (or have had the opportunity to learn) system architecture from analysis of arcade cabinets, starting with a CPU, adding ram, rom, peripherals, etc. Ben Eater’s 6502 computer kit[0] comes very close and is closer to the ballpark of what I would want out of a learning experience.
[0]: https://eater.net/6502
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What's needed to build an Apple 1 Breadboard
The biggest hurdle to build an Apple 1 replica is getting the parts for which no modern replacement exist, like the funky 1024 X 1 shift registers in the video display terminal circuit. These represent the bulk of the costs. As an alternative, you can get real close to the Apple 1 with Ben Eater's 6502 breadboard computer project. One of the most recent videos actually shows how WozMon (the original Apple 1 "operating system") runs on it.
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Help with picking a microcontroller
Thanks for the reply. As far as 6502s go, this link will tell you everything you need to know to get up and running...https://eater.net/6502
- Is there a course that teaches you how to program hardware? If so what is your recommendation?
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Best solder-it-yourself type retro computer kits?
I know you asked about a soldering kit, but there is this breadboard 6402 kit that comes with all the chips. https://eater.net/6502 I highly recommend getting ther serial kit as well.
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RS232 with a 6551 UART
Very nice! Can you add the updated schematic also on https://eater.net/6502?
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Thinking abojt building a computer and looking for resources.
I think the 6502 and Z80 processors would be good options. It seems like both have good supporting communities, and you can source the parts easily (and they're not crazy expensive). If you end up going with the 6502, Ben Eater's video series is helpful. I would expect there are similar video series out there for Z80.
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What exactly is assembly language?
Modern systems are complicated, you often can't communicate directly with the CPU, you need to deal with the underlying operating system, interacting with the kernel and making system calls. So if you plan to write a whole program, it's easier to do some embedded programming with an Arduino or a 6502 or something. I'd recommend watching Ben Eater's series of videos on this subject.
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egg_irl
Have you been following Ben Eater's long-running build a 6502 computer series? It's pretty great!
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What pin out does bens 4 bit code use?
Did you have the LCD working previously in 8-bit mode? Do you have the rest of the VIA (U5) wired up as shown in Ben's schematic at https://eater.net/6502?
What are some alternatives?
tashtalk - An interface for Apple's LocalTalk networking protocol.
BeEhBasic - BeEhBasic is EhBasic for the Ben Eater 6502
its - Incompatible Timesharing System
cassette-elite-beebasm - Fully documented and annotated source code for the cassette version of Elite on the BBC Micro
PLASMA - Proto Language AsSeMbler for All (formerly Apple)
appler - Apple ][ emulator for MS-DOS, written in 8088 assembly
apple2_hgrbyte - Explore the Apple 2 HGR amd DHGR esoteric screen layout with bit twiddling and byte manipulation.
unzx0_68000 - Free, zlib licensed ZX0 decompressor for the 68000
6502 - DB6502: 65C02 based computer inspired by BE6502
AppleIICalculator - Desktop Calculator for the Apple II
6502bench - A workbench for developing 6502 code