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#6502CPU

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Topaz 🐇<p>I managed to get a 6502 CPU running on the ULX3S and wrote a 16 color indexed display RAM module for it. The CPU also has access to all the buttons and the LEDs, which are counting up the current low byte of display RAM. Its the most complex bit of Verilog I've written so far. I hope to add basic sound support next, and then I'll have made my own little toy console to mess with. <a href="https://oldbytes.space/tags/ulx3s" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ulx3s</span></a> <a href="https://oldbytes.space/tags/fpga" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>fpga</span></a> <a href="https://oldbytes.space/tags/6502CPU" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>6502CPU</span></a></p>
Carsten Strotmann<p><a href="https://mastodon.social/tags/VolksForth" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>VolksForth</span></a> booted today on the <a href="https://mastodon.social/tags/Sorbus" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Sorbus</span></a> Computer (made by SvOlli -&gt; <a href="https://xayax.net/sorbus/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="">xayax.net/sorbus/</span><span class="invisible"></span></a>) <a href="https://mastodon.social/tags/Forth" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Forth</span></a> <a href="https://mastodon.social/tags/retrocomputing" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>retrocomputing</span></a> <a href="https://mastodon.social/tags/6502CPU" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>6502CPU</span></a></p>
eiZen<p>RISC architecture may "gonna change everything", m'kay, but do you also see numbers, like me?</p><p>Here, two take a Kawasaki KLR 650 which makes it a... 6502.</p><p>- <a href="https://www.imcdb.org/vehicle_99638-Kawasaki-KLR-650-1987.html" rel="nofollow noopener" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">imcdb.org/vehicle_99638-Kawasa</span><span class="invisible">ki-KLR-650-1987.html</span></a><br> <br><a href="https://mastodon.sdf.org/tags/Hackers" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Hackers</span></a> <a href="https://mastodon.sdf.org/tags/6502cpu" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>6502cpu</span></a> <a href="https://mastodon.sdf.org/tags/Kawasaki" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Kawasaki</span></a> <a href="https://mastodon.sdf.org/tags/motorcycle" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>motorcycle</span></a></p>
Hacker News<p>Visual Transistor-level Simulation of the 6502 CPU</p><p><a href="http://www.visual6502.org/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">http://www.</span><span class="">visual6502.org/</span><span class="invisible"></span></a></p><p><a href="https://mastodon.social/tags/HackerNews" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>HackerNews</span></a> <a href="https://mastodon.social/tags/VisualTransistorSimulation" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>VisualTransistorSimulation</span></a> <a href="https://mastodon.social/tags/6502CPU" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>6502CPU</span></a> <a href="https://mastodon.social/tags/RetroComputing" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>RetroComputing</span></a> <a href="https://mastodon.social/tags/CPUArchitecture" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>CPUArchitecture</span></a> <a href="https://mastodon.social/tags/HardwareSimulation" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>HardwareSimulation</span></a></p>
Daniel<p>"Calypsi" is a collection of compilers and assemblers that run under Windows, Linux and macOS and can generate code for various retro platforms - 6502 and 68000 processors are supported, among others. Although the project is hosted on Github, the source code is not freely available and use of the tools is only permitted for private purposes. Now version 5.10 is available. Changes:</p><p><a href="https://www.amiga-news.de/en/news/AN-2025-04-00045-EN.html" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">amiga-news.de/en/news/AN-2025-</span><span class="invisible">04-00045-EN.html</span></a></p><p><a href="https://fosstodon.org/tags/Amiga" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Amiga</span></a> <a href="https://fosstodon.org/tags/development" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>development</span></a> <a href="https://fosstodon.org/tags/compiler" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>compiler</span></a> <a href="https://fosstodon.org/tags/assembler" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>assembler</span></a> <a href="https://fosstodon.org/tags/motorola_68000" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>motorola_68000</span></a> <a href="https://fosstodon.org/tags/6502CPU" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>6502CPU</span></a></p>
Ian Neill<p>Just arrived today... Ordered this as I am not sure if the one I have is faulty.</p><p>Most likely it is my Arduino glue logic code that is faulty and not the <a href="https://mastodon.ie/tags/6502CPU" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>6502CPU</span></a>. However, just in case I do break, or have broken it, there is no harm having a spare!</p><p>Also, there is no such thing as having too many 6502's 😁</p>
Erik van Straten<p><span class="h-card" translate="no"><a href="https://social.treehouse.systems/@cas" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>cas</span></a></span> : slow?</p><p>Mwah, after asm hacking (6510) I learned Pascal with an "editor", compiler and linker loaded from multiple cassette tapes (one at a time) on my Commodore 64 (more than 40 years ago).</p><p>Later I learned 68HC11 asm which was a nice CPU too, slightly better than 6502 (or 6510). Of course the 68000 was a giant step (considering Zilog Z80 and Intel 8080 via 8086 to 80286 CPU's).</p><p>Nice to see that there are still people who love to hack low level stuff. The world will keep needing those who understand "basic" building blocks!</p><p><span class="h-card" translate="no"><a href="https://mastodon.social/@never_released" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>never_released</span></a></span> </p><p><a href="https://infosec.exchange/tags/6502CPU" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>6502CPU</span></a> <a href="https://infosec.exchange/tags/C64" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>C64</span></a> <a href="https://infosec.exchange/tags/68HC11" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>68HC11</span></a> <a href="https://infosec.exchange/tags/68k" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>68k</span></a> <a href="https://infosec.exchange/tags/Z80" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Z80</span></a> <a href="https://infosec.exchange/tags/i80x86" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>i80x86</span></a></p>
0x10f<p>Two versions of a 6502 assembly routine. We have a byte in X. Its bits are denoted %ABCDEF00. We want to get bits %0BCADEF1 in the accumulator. Each version is 23 bytes. The first one doesn't need a look-up table. The second one does but is much faster and doesn't need a temporary variable.<br><a href="https://tech.lgbt/tags/6502cpu" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>6502cpu</span></a> <a href="https://tech.lgbt/tags/assembly" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>assembly</span></a></p><p>; version 1<br>txa<br>and #%01100000<br>sta temp<br>txa<br>lsr a<br>lsr a<br>lsr a<br>and #%00010000<br>ora temp<br>sta temp<br>txa<br>lsr a<br>and #%00001110<br>ora temp<br>ora #%00000001</p><p>; version 2<br>txa<br>asl a<br>rol a<br>rol a<br>rol a<br>and #%00000111<br>tay<br>txa<br>lsr a<br>and #%00001110<br>ora table,y<br>...<br>; look-up table for version 2<br>table: db $01, $21, $41, $61, $11, $31, $51, $71</p>
Carsten Strotmann<p>Selbstbau neo6502 Schlepptop von WOST auf dem Forth Sommertreff im UpH in Essen</p><p><a href="https://mastodon.social/tags/forth" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>forth</span></a> <a href="https://mastodon.social/tags/6502CPU" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>6502CPU</span></a> <a href="https://mastodon.social/tags/neo6502" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>neo6502</span></a></p>
Torsten Roeder<p>Enjoying Michael Steils fantastic “Ultimate Commodore 64 Talk“! <a href="https://fedihum.org/tags/C64" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>C64</span></a> <a href="https://fedihum.org/tags/6502CPU" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>6502CPU</span></a></p>
Mark J Koch ✅<p>Cyberspace-1 clock board up and running! Other than solder issue, it just works. The crystal clock source seems to run but not at the right rate. Will need to debug that. See video for show and tell. <a href="https://mastodon.social/tags/cyberspace1" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>cyberspace1</span></a> <a href="https://mastodon.social/tags/6502CPU" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>6502CPU</span></a></p>
Mark J Koch ✅<p>Time to toggle off the Zodiac project while I wait for a couple missing parts to show up. Moved over to my Cyberspace-1 home brew 6502 project. Remaining parts showed up for that yesterday so had a Zen solder party to get this one ready for bring-up tomorrow. If this works, I can continue design work for the CPU card, memory card and Video/IO card. Loosely based on the HBC-56 homebrew computer by a GitHub user called visrealm. <a href="https://mastodon.social/tags/homebrewcomputer" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>homebrewcomputer</span></a> <a href="https://mastodon.social/tags/6502CPU" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>6502CPU</span></a></p>
Jose Morales<p>Finally had some time to get some quality youtube time this evening… <a href="https://youtu.be/75jz8UZjrTo?si=vZHYkkSCbHwNOv7Q" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">youtu.be/75jz8UZjrTo?si=vZHYkk</span><span class="invisible">SCbHwNOv7Q</span></a> this is an amazingly well documented and produced video and project. A <a href="https://universeodon.com/tags/6502CPU" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>6502CPU</span></a> computer on a <a href="https://universeodon.com/tags/rp2040" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>rp2040</span></a> all in <a href="https://universeodon.com/tags/assembler" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>assembler</span></a>. Highly recommend Dave’s video. Open up the opportunities for more <a href="https://universeodon.com/tags/retrocomputing" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>retrocomputing</span></a> on a budget!</p>
Bits&Terminal Jeff<p>You never forget your first true love.</p><p><a href="https://oldbytes.space/tags/6502cpu" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>6502cpu</span></a> <a href="https://oldbytes.space/tags/65c02" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>65c02</span></a> <a href="https://oldbytes.space/tags/8bit" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>8bit</span></a> <a href="https://oldbytes.space/tags/cpu" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>cpu</span></a> <a href="https://oldbytes.space/tags/retroComputing" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>retroComputing</span></a></p>
𝗌𝗆𝗈𝗄𝗎<p>There are two really cool <a href="https://chrome.pl/tags/raspberrypipico" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>raspberrypipico</span></a> + <a href="https://chrome.pl/tags/6502CPU" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>6502CPU</span></a> <a href="https://chrome.pl/tags/8bit" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>8bit</span></a> computer project I am following closely:</p><ul><li><a href="https://github.com/picocomputer" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="">github.com/picocomputer</span><span class="invisible"></span></a></li><li><a href="https://github.com/OLIMEX/Neo6502" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="">github.com/OLIMEX/Neo6502</span><span class="invisible"></span></a></li></ul><p><a href="https://chrome.pl/tags/retrocomputing" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>retrocomputing</span></a></p>
Ian Neill<p>Sitting here studying the <a href="https://mastodon.ie/tags/6502cpu" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>6502cpu</span></a> addressing modes, indexed indirect and indirect indexed, to be specific... Deciding to write your own emulator in <a href="https://mastodon.ie/tags/C" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>C</span></a>++ really does demand that you know the details intimately! Page wrap-around, or not, and extra cycles for page boundary crossings are all extremely interesting details!</p>
Nate L<p>The KIM-1 replica lives!<br><a href="https://fosstodon.org/tags/kim1" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>kim1</span></a> <a href="https://fosstodon.org/tags/diyelectronics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>diyelectronics</span></a> <a href="https://fosstodon.org/tags/6502cpu" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>6502cpu</span></a> <a href="https://fosstodon.org/tags/retrocomputer" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>retrocomputer</span></a> <a href="https://fosstodon.org/tags/retrocomputing" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>retrocomputing</span></a></p>
Ian Neill<p><span class="h-card"><a href="https://hachyderm.io/@digichelle" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>digichelle</span></a></span> Nothing to be sad about! I am the same, mostly emulated because who has the space it all? I visit a museum for my "fix" of the real stuff. I think they still have a virtual tour.</p><p><a href="https://mastodon.ie/tags/NationalMuseumOfComputing" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NationalMuseumOfComputing</span></a></p><p><a href="https://www.tnmoc.org/" rel="nofollow noopener" target="_blank"><span class="invisible">https://www.</span><span class="">tnmoc.org/</span><span class="invisible"></span></a></p><p>Although, I am currently playing with a real <a href="https://mastodon.ie/tags/6502CPU" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>6502CPU</span></a> on a breadboard with an <a href="https://mastodon.ie/tags/Arduino" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Arduino</span></a> for all the glue logic. Having fun writing some <a href="https://mastodon.ie/tags/assembly" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>assembly</span></a> for it.</p>
Jesse Buchanan<p>Clock circuit for Ben Eater's 6502 computer kit: complete! This was my first ever experience with building electronics on breadboards and I learned a lot.</p><p><a href="https://hachyderm.io/tags/6502cpu" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>6502cpu</span></a></p>
chexum<p>A <a href="https://hachyderm.io/tags/linux" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>linux</span></a> (and <a href="https://hachyderm.io/tags/unix" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>unix</span></a>) guy with varied interests in the <a href="https://hachyderm.io/tags/kernel" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>kernel</span></a>, <a href="https://hachyderm.io/tags/networking" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>networking</span></a> and <a href="https://hachyderm.io/tags/filesystems" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>filesystems</span></a>, generally <a href="https://hachyderm.io/tags/sysadmin" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>sysadmin</span></a> stuff, some computer languages, a few earlier technologies <a href="https://hachyderm.io/tags/m68k" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>m68k</span></a> <a href="https://hachyderm.io/tags/z80" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>z80</span></a> <a href="https://hachyderm.io/tags/6502cpu" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>6502cpu</span></a>, and <a href="https://hachyderm.io/tags/retrocomputing" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>retrocomputing</span></a> history including old arcade games (thus <a href="https://hachyderm.io/tags/fpga" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>fpga</span></a>).<br>Active fan of <a href="https://hachyderm.io/tags/openstreetmap" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>openstreetmap</span></a> and <a href="https://hachyderm.io/tags/sunset" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>sunset</span></a> photos.<br><a href="https://hachyderm.io/tags/introduction" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>introduction</span></a></p>
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