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mos6502
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6502 posts - new projects and interesting old projects from the archives
6502 posts - new projects and interesting old projects from the archives

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That's all folks! This is our final post here on G+. Thanks for all your comments, plusses and reshares over the years.

As a fade-out we'll just watch Mike Kohn's Apple-II robot do its thing, programmed in Basic:
https://www.youtube.com/watch?v=MPA4GHndOHE

Mike "created a board that allows an Apple IIe to run off of a LiPO battery, then glued motors to it, created a motor control board, and connected the two together through the Apple IIe joystick port. The Apple IIe sends commands using two signals (clock / data) telling the motor control board to move forward, turn, strike with a plastic sword, or speak."

We might yet put up a static archive of all our posts somewhere on 6502.org - in the meantime keep in touch with retrocomputists at
https://pluspora.com/tags/retrocomputing
or register here for a possible resurrection of G+ retrocomputing communities:
http://retrocomputingforum.com

All our G+ posts are archived - see our summary posts and follow the links at
http://forum.6502.org/viewtopic.php?t=5492

Ref:
http://www.mikekohn.net/micro/apple_iie_robot.php
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This week, in our final post on 6502 Software here on G+, we bring you an SVG renderer by Kevin Savetz, written in Turbo Basic XL for the Atari 8 bit line. The code is open sourced, and not fast, but:
"The idea was to reasonably parse modern SVG files. It's not optimized to be fast; it 's a wonder that it works at all. If this was for a game or something I'd do it differently. I don't care that it's not fast, just having fun."
- From a comment on this video of the renderer in action:
https://www.youtube.com/watch?v=W3Qb9vjVn1Y

Turbo Basic XL is also interesting, in being a type-in program, and in being both a faster interpreter and also a compiler for Atari Basic. It's from as late as 1985. See
https://en.wikipedia.org/wiki/Turbo-Basic_XL

And the Atari 1020 four-pen plotter? That's got a 6502 inside too! As we posted previously:
https://web.archive.org/web/2222/https://plus.google.com/108984290462000253857/posts/S7HNKAUDCCQ

via hackaday

All our G+ posts are archived - see our summary posts and follow the links at
http://forum.6502.org/viewtopic.php?t=5492
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This week, our final 6502 Hardware post here on G+, we see 'emard' has forked Grant Searle's FPGA work on the UK101 to create an Orao implementation which runs on their own ULX2S, a DIL-format Lattice development board using an XP2 FPGA. If you're not familiar with the Orao, perhaps you can run an emulator on your SAM Coupé?
"This is an Orao emulator for the SAM Coupé. It emulates the Croatian Eagle home computer, a 6502-based machine developed by PEL Varaždin and released in 1985."
- https://simonowen.com/sam/oraoemu/

>EAGLE< EXTENDED BASIC
(C) 85
23534 BYTES FREE

We jest - the SAM is after all a Z80 machine - so perhaps check out this Orao emulator for Windows:
http://www.deltasoft.com.hr/retro/oraoemu.htm

We save the best 'til last: an in-browser Orao emulator with authentic look and feel, by Hrvoje Cavrak:
http://orao.hrvoje.org/

All our G+ posts are archived - see our summary posts and follow the links at
http://forum.6502.org/viewtopic.php?t=5492
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This week, a 64 byte C64 demo, explained. "The small program we wrote is not a conventional or spectacular demo; like almost all of the work by nom de nom, it uses character graphics exclusively. But since we like sizecoding on the Commodore 64, we wanted to explain this small program byte by byte. We hope this explanation will be understandable to interested people who know how to program, even if they may not have much assembly or C64 experience."
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This week, Acorn's Atom gets HDMI output and shows it really has 12 colours including three shades of orange. (Generally it's regarded as a 4-colour machine with a choice of two palettes, but it turns out the text and graphics modes have slightly different shades available.) The HDMI output in this case is by means of a Raspberry Pi, with a CPLD middle-end to capture the pixels, and an analogue front end to digitise the Atom's non-binary output levels. The same kinds of techniques might well work with an Amstrad CPC.
...
The original Atom colour board was quite tricky, and there are later and modern designs which do a good job of removing the video-contention noise and producing good levels. The thread is well worth a read! Here's the intro post:
"""I thought I would start a new thread to record my experiences with various Atom colour boards. Since I got my Colour Atom a few weeks ago, I've tried several different ways of getting a proper colour picture:
- The original Acorn colour board that was fitted with an RGB output
- Phill's new design (based on the LMH1251) with an RGB output
- Using Y PA PB on connector PL4 directly as a YPrPb output
- My own design, that I've been playing with this weekend
"""

The RGBtoHDMI project also works wonders for a BBC Micro, as well as for a ZX Spectrum:
https://github.com/hoglet67/RGBtoHDMI/wiki
Other Atom and video projects from the same source:
https://github.com/hoglet67/AtomGodilVideo
https://github.com/hoglet67/AtomVGAWing

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This week, in our final post on 6502 Emulation here on G+, we bring you SIM8800 - An Altair Emulator for Apple II by Charles Mangin. For extra joy, it runs in your browser in an Apple II emulator. The core 8080 emulator code is based on Apple80 by Dann McCreary - from 1979. You can read all about that here:
https://www.pagetable.com/?p=824

The in-browser emulation link is
https://archive.org/details/SIM8800

All our G+ posts are archived - see our summary posts and follow the links at
http://forum.6502.org/viewtopic.php?t=5492

We might yet put up a static archive of all our posts somewhere on 6502.org - in the meantime keep in touch with retrocomputists at
https://pluspora.com/tags/retrocomputing
or register here for a possible resurrection of G+ retrocomputing communities:
http://retrocomputingforum.com
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This week, our final 6502 Nostalgia and History post here on G+, we present the ALPHA 1 from MCS in Germany. It's like a KIM-1, but much more so. We link here to Hans Otten's page which collects many references together - including an article about this machine which he wrote back in 1979, which was published in Radio Bulletin. He writes:
"The ALPHA-1 is an early computer, produced in 1977. The design is influenced heavily by the KIM-1 with many improvements and enhancements. It is ready to run, has a KIM-1 compatible cassette file format. The system exist of an external CPU board and a cased display/keyboard I/O system."

All our G+ posts are archived - see our summary posts and follow the links at
http://forum.6502.org/viewtopic.php?t=5492
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This week, a C64 emulated on a Teensy board - that's an ARM-based microcontroller with 256k RAM running at 180MHz on a DIL-format PCB. Project by Frank Bösing, from a couple of years back, and seems to have grown upwards and outwards from a SID emulation. And it's open source! Originally intended to emulate Boulderdash successfully, it's able to do rather more than that now.
"He admits that he underestimated the video chip on the C64 (VIC-II), but that turned out to a good thing. Had he known what he was in for he might not have started the project. In the meantime, he has rewritten the code for the VIC-II a few times."

Video within. Github here:
https://github.com/FrankBoesing/Teensy64

Via chuckt on c128 forums.
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This week, we're visiting the land of Minitel, the game-changing initiative which put an online digital service into every home - every home in France, eventually. And the 6502 was often part of the story, in this case the Computel server running on an Apple II. Indeed, the software, in 6502 assembly language, has been recovered from 30 backup floppies with the help of Floppy Emu and alcohol, and is now on github:
https://github.com/cquest/cristel/blob/master/cristel.a
...
The backup restore adventure, including wrestling with copy protection, is over here, in French:
https://medium.com/@cq94/75837443d7b3

The 6502-based Oric Telestrat even had minitel built in:
https://fr.wikipedia.org/wiki/Oric_Telestrat

indirectly via +Emmanuel Florac on diaspora:
https://pluspora.com/posts/474348
(more 6502-minitel stories and info in that post, and comments)
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This week, a NES emulation in Emacs (!?!) and therefore a 6502 emulator in Lisp. Almost, but not quite, in 1k lines of code, too. Very much a work in progress and of course not rendering at full speed. (What did you expect?)
...
On lobste.rs we see this comment:
> > I’m not sure if Emacs can really be made to do this kind of thing.
> said no one, ever
gongo/emacs-nes
gongo/emacs-nes
github.com
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