{"id":14839,"date":"2022-12-22T15:02:46","date_gmt":"2022-12-22T15:02:46","guid":{"rendered":"https:\/\/bryceautomation.com\/?p=14839"},"modified":"2022-12-22T16:20:26","modified_gmt":"2022-12-22T16:20:26","slug":"inverting-q-on-elf-mc","status":"publish","type":"post","link":"https:\/\/bryceautomation.com\/index.php\/2022\/12\/22\/inverting-q-on-elf-mc\/","title":{"rendered":"Inverting Q on the ELF MC"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Introduction to Inverting Q on the ELF MC<\/h2>\n\n\n\n<p>Certain firmware requires Inverting Q on the ELF MC (1802 ELF Membership Card).  This is usually true when you have the front panel attached, which is revision J or later.  In my case, I wanted to run <a href=\"http:\/\/www.sunrise-ev.com\/MembershipCard\/disklessElfOS.hex\">Diskless ELF\/OS<\/a> (and still have the Front Panel)  I <a href=\"https:\/\/bryceautomation.com\/index.php\/2022\/12\/22\/how-to-burn-an-eprom\/\">burned the firmware <\/a>at memory location 0000.  After that, I set up the jumpers on the board so that U2 is LOW, and U8 is HIGH.  At this point, I connected my terminal at 4800bps.  When I hit enter, all I had on the terminal was garbage.  <\/p><div id=\"bryce-2411331389\" class=\"bryce-afterfirst bryce-entity-placement\"><script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-8316758073402323\" crossorigin=\"anonymous\"><\/script><ins class=\"adsbygoogle\" style=\"display:block;\" data-ad-client=\"ca-pub-8316758073402323\" \ndata-ad-slot=\"7728240895\" \ndata-ad-format=\"auto\"><\/ins>\n<script> \n(adsbygoogle = window.adsbygoogle || []).push({}); \n<\/script>\n<\/div>\n\n\n\n<p>After reading up on this firmware at Lee Hart&#8217;s page, I realized that Q is inverted on my board compared to previous versions.  This is the transmit signal from the ELF MC&#8217;s front panel.  <\/p>\n\n\n\n<p>To invert this signal, I used a 74HC00N IC, which is a NAND gate.  We just have to set up the circuitry to operate as a NOT gate.  This will invert the signal.  In other words, when the ELF sends out a HIGH signal, the NOT gate converts this to a LOW signal.  On the other hand, if the ELF sends a LOW signal, the NOT converts this to a HIGH signal.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Setting up the IC<\/h2>\n\n\n\n<p>My TTL programming cable has separate wires.   I was able to keep the programmer&#8217;s transmit signal connected to the Front Panel.  If you have a standard programmer, simply breakout the pins on a breadboard.  This allows you to access each one individually with your breadboard jumpers.<\/p>\n\n\n\n<p>The COSMAC Elf Front Panel&#8217;s transmit pin will need to go through our NOT gate, though.  As I said before, I simply used a 74HC00N IC, and set up the circuitry to act as a NOT gate.  NAND gates are very handy to have on hand, because it&#8217;s a universal gate.  That is to say, we can make any type of gate by combining NAND gates together in various configurations.  To create a NOT, just tie all the inputs together for the NAND gate.  In this case, there are only two inputs for each gate.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"549\" height=\"418\" data-src=\"https:\/\/bryceautomation.com\/wp-content\/uploads\/2022\/12\/nand.png\" alt=\"\" class=\"wp-image-14840 lazyload\" data-srcset=\"https:\/\/bryceautomation.com\/wp-content\/uploads\/2022\/12\/nand.png 549w, https:\/\/bryceautomation.com\/wp-content\/uploads\/2022\/12\/nand-300x228.png 300w\" data-sizes=\"(max-width: 549px) 100vw, 549px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 549px; --smush-placeholder-aspect-ratio: 549\/418;\" \/><\/figure>\n\n\n\n<p>As you can see, the Transmit signal from the ELF connects to pins 1 and 2 of the NAND gate.  Pin 3 of the NAND gate will connect to RX on your programmer.<\/p>\n\n\n\n<p>In short, your connections will be as follows:<\/p>\n\n\n\n<p>Programmer                                           1802 Elf MC Font Panel<\/p>\n\n\n\n<p>GND &#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;&gt; GND<\/p>\n\n\n\n<p>VCC &#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;&gt; VCC<\/p>\n\n\n\n<p>TX &#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-&gt; RX<\/p>\n\n\n\n<p>RX &#8212;&#8212;&#8212;&#8212;&#8212;-| NOT | &#8212;&#8212;&#8212;&#8212;&#8211;&gt; TX<\/p>\n\n\n\n<p>Don&#8217;t forget that you need to ground pin 6 to bring the front panel out of standby mode.<\/p>\n\n\n\n<p>Remember that you also need to supply VCC and GND to the NAND gate.  Pin 7 of the 74HC00N is GND, and Pin 14 is VCC.<\/p>\n\n\n\n<p>                                                     <\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Connect to your Terminal after Inverting Q on the ELF MC<\/h2>\n\n\n\n<p>At this point, I used minicom to connect to the Membership Card at 4800\/8\/N\/1.  As soon as I pressed enter, I could see that I was up and running!  This ROM supports several different programming languages that I wanted to experiment with.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"252\" height=\"331\" data-src=\"https:\/\/bryceautomation.com\/wp-content\/uploads\/2022\/12\/image-38.png\" alt=\"\" class=\"wp-image-14841 lazyload\" data-srcset=\"https:\/\/bryceautomation.com\/wp-content\/uploads\/2022\/12\/image-38.png 252w, https:\/\/bryceautomation.com\/wp-content\/uploads\/2022\/12\/image-38-228x300.png 228w\" data-sizes=\"(max-width: 252px) 100vw, 252px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 252px; --smush-placeholder-aspect-ratio: 252\/331;\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Summary for Inverting Q on the ELF MC<\/h2>\n\n\n\n<p>In Summary, you are passing all of the signals through from your programmer to the Elf&#8217;s front panel, except for the programmer&#8217;s RX Pin.  We need to add a NOT gate between the ELF&#8217;s TX Pin, and the Programmer&#8217;s RX Pin.  Since the 1802 uses the Q output of the processor as Transmit, we are effectively inverting Q.<\/p>\n\n\n\n<p>For my setup, I found a small wooden treasure box at Wal-Mart.  The Elf MC fits nicely into this box with a small breadboard.  I can even shut the lid with all of the connections in place.  It&#8217;s important to realize, though, that when you use a breadboard, you are adding resistance on each connection.  <\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"343\" height=\"457\" data-src=\"https:\/\/bryceautomation.com\/wp-content\/uploads\/2022\/12\/elfmcsmall.png\" alt=\"\" class=\"wp-image-14843 lazyload\" data-srcset=\"https:\/\/bryceautomation.com\/wp-content\/uploads\/2022\/12\/elfmcsmall.png 343w, https:\/\/bryceautomation.com\/wp-content\/uploads\/2022\/12\/elfmcsmall-225x300.png 225w\" data-sizes=\"(max-width: 343px) 100vw, 343px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 343px; --smush-placeholder-aspect-ratio: 343\/457;\" \/><\/figure>\n\n\n\n<p>I like to use hot glue to hold these components in.  This is because the hot glue is not permanent, and it&#8217;s easy to work with.  You can easily break the bond of hot glue by using alcohol.<\/p>\n\n\n\n<p>For more information, visit the <a href=\"https:\/\/bryceautomation.com\/index.php\/category\/vintage-computers\/\">Vintage Computer Cagegory Page!<\/a><\/p>\n\n\n\n<p>&#8212; Ricky Bryce<\/p>\n<div id=\"bryce-3260905187\" class=\"bryce-after-content bryce-entity-placement\"><script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-8316758073402323\" crossorigin=\"anonymous\"><\/script><ins class=\"adsbygoogle\" style=\"display:block;\" data-ad-client=\"ca-pub-8316758073402323\" \ndata-ad-slot=\"4667596182\" \ndata-ad-format=\"auto\"><\/ins>\n<script> \n(adsbygoogle = window.adsbygoogle || []).push({}); \n<\/script>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Introduction to Inverting Q on the ELF MC Certain firmware requires Inverting Q on the ELF MC (1802 ELF Membership Card). This is usually true when you have the front panel attached, which is revision J or later. In my case, I wanted to run Diskless ELF\/OS (and still have the Front Panel) I burned <a class=\"moretag btn btn-primary\" href=\"https:\/\/bryceautomation.com\/index.php\/2022\/12\/22\/inverting-q-on-elf-mc\/\">Read More \u00bb<\/a><\/p>\n","protected":false},"author":1,"featured_media":14840,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[821,727],"tags":[889,888],"class_list":{"0":"post-14839","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-cosmac","8":"category-vintage-computers","9":"tag-elf-mc","10":"tag-inverting-q","11":"czr-hentry"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Inverting Q on the ELF MC - Bryce Automation<\/title>\n<meta name=\"description\" content=\"We&#039;ll be Inverting Q on the ELF MC. 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