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<!doctype html><title>etc-nand</title><meta charset=utf-8><meta content="width=device-width,initial-scale=1" name=viewport><link href=res/favicon.png rel=icon sizes=512x512><link href=res/favicon.png rel=image_src type=image/png><link title="alexs168's blog" href=atom.xml rel=alternate type=application/atom+xml><body><style>@font-face{font-family:DejaVu Sans Mono;src:local(DejaVu Sans Mono),url(res/DejaVuSansMono.woff2)format("woff2"),local(Courier New),local(Courier),local(monospace);font-weight:400;font-style:normal;font-display:swap}body{font-family:DejaVu Sans Mono;font-size:10pt}td{vertical-align:top;width:100%;display:inline}h1,h2,h3,h4{margin-top:1%;margin-bottom:.75%}p{margin-top:.75%;margin-bottom:.75%}ul{margin-top:0%}.current{font-weight:700}pre{margin-top:0;margin-bottom:0;display:inline}a,a:visited{color:#3f51b5;text-decoration:none}</style><div><p><br><h1>etc-nand</h1></div><div><p><br><span style=text-decoration:underline><h2>Overview</h2></span><p>etc-nand is a real-world <a href=https://github.com/ETC-A/etca-spec/>ETC.A</a> CPU built from almost only quad NAND gate ICs (74hc00)<p>It will probably be finished in a few months.</div><div><p><br><span style=text-decoration:underline><h3>Estimates</h3></span><p>Estimated gate count:<ul><li>2800 NAND gates<li>320 tristate buffers</ul><p><br> Estimated component counts:<ul><li>700x 74hc00 quad NAND gates<li>40x 74HC54 octal tristate buffers<li>a few simple resistors</ul></div><div><p><br><span style=text-decoration:underline><h3>Planned Specifications</h3></span> ETC.A base instruction set + byte operations + S&F + Von Neumann<p>The CPU will communicate with peripherals over a 16 bit data + 15 bit address memory bus</div><div><p><br><span style=text-decoration:underline><h2>Purchase</h2></span> You will be able to purchase one in the future.<p>Stay tuned!</div><div><br><span style=text-decoration:underline><h2>Images</h2></span> Images of PCBs that are either already manifactured or currently beeing manifactured by JLCPCB.</div><div><p><br><span style=text-decoration:underline><h3>16 bit register</h3></span></p><img src=res/etc-nand/reg16_front.png style=width:100%></div><div><p><br><span style=text-decoration:underline><h3>8 bit ALU slice</h3></span> A <a href=#add8>8 bit adder module</a> will be placed in the middle</p><img src=res/etc-nand/alu8_front.png style=width:100%></div><div><p><br><span id=add8 style=text-decoration:underline><h3>8 bit adder</h3></span></p><img src=res/etc-nand/add8_front.png style=width:100%></div><script>var gotoVariant=(a=>{window.location.href=window.location.href.replace(/\.\w+.html/g,a)});window.addEventListener(`beforeprint`,a=>{gotoVariant(`.min.pdf`)})</script><script async src=coffee.js></script> |