{"id":18592,"date":"2026-04-05T15:26:08","date_gmt":"2026-04-05T15:26:08","guid":{"rendered":"https:\/\/bryceautomation.com\/?p=18592"},"modified":"2026-04-05T15:42:18","modified_gmt":"2026-04-05T15:42:18","slug":"xmodem_gateway","status":"publish","type":"post","link":"https:\/\/bryceautomation.com\/index.php\/2026\/04\/05\/xmodem_gateway\/","title":{"rendered":"XMODEM Gateway: File Transfers and SSH for Retro Hardware"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Introduction to XMODEM Gateway<\/h2>\n\n\n\n<p>If you have a Commodore 64, an AltairDuino running CP\/M, or any terminal that speaks telnet, XMODEM Gateway gives you file transfers, SSH access to remote servers, and AI chat &#8212; all from a single telnet connection.  I&#8217;ve tested this with IMP8 on the Altairduino.  IMP8 is on a a default floppy disk image that usually ships with your Altairduino.  To see how to use this, visit the link for getting the<a href=\"https:\/\/bryceautomation.com\/index.php\/2022\/04\/19\/altairduino-on-the-internet\/\"> Altairduino on the Internet<\/a>.<\/p><div id=\"bryce-3838972420\" 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>XMODEM Gateway is a Rust server that listens on port 2323 (configurable) and serves three features through a simple menu-driven interface:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>File Transfer<\/strong> &#8212; Upload and download files using the XMODEM protocol with CRC-16 error checking and automatic checksum fallback<\/li>\n\n\n\n<li><strong>SSH Gateway<\/strong> &#8212; Connect through the server to any SSH host, letting telnet-only hardware reach modern servers<\/li>\n\n\n\n<li><strong>AI Chat<\/strong> &#8212; Ask questions and get answers from a large language model, paginated to fit your screen.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"319\" height=\"268\" data-src=\"https:\/\/bryceautomation.com\/wp-content\/uploads\/2026\/04\/xmodemgateway.png\" alt=\"XMODEM Gateway Main Menu.\" class=\"wp-image-18594 lazyload\" data-srcset=\"https:\/\/bryceautomation.com\/wp-content\/uploads\/2026\/04\/xmodemgateway.png 319w, https:\/\/bryceautomation.com\/wp-content\/uploads\/2026\/04\/xmodemgateway-300x252.png 300w\" data-sizes=\"(max-width: 319px) 100vw, 319px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 319px; --smush-placeholder-aspect-ratio: 319\/268;\" \/><\/figure>\n\n\n\n<p>The server auto-detects your terminal type when you connect. Press Backspace, and it figures out whether you are on a Commodore 64 (PETSCII), a modern terminal (ANSI), or a plain text connection (ASCII). Output is adapted accordingly &#8212; 40-column layouts for the C64, ANSI color codes for modern terminals, and clean plain text for everything else.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Setting up XMODEM Gateway<\/h2>\n\n\n\n<p>Install Rust if you do not have it:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><\/li>\n<\/ol>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo apt install build-essential cmake\ncurl --proto '=https' --tlsv1.2 -sSf https:\/\/sh.rustup.rs | sh<\/code><\/pre>\n\n\n\n<p>Clone and build:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>git clone https:\/\/github.com\/rickybryce\/xmodem-gateway.git\ncd xmodem-gateway\ncargo build --release\n.\/target\/release\/xmodem-gateway<\/code><\/pre>\n\n\n\n<p>On first run, the server creates <code>xmodem.conf<\/code> with default settings and a <code>transfer\/<\/code> directory for files. Connect from any machine on your network:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>telnet 192.168.1.100 2323<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Transferring files using XMODEM Gateway<\/h2>\n\n\n\n<p>From the main menu, press <strong>F<\/strong> for File Transfer. Press <strong>U<\/strong> to upload or <strong>D<\/strong> to download. For uploads, enter a filename, then start your terminal program&#8217;s XMODEM send. For downloads, select a file from the list and start XMODEM receive on your end. The server supports CRC-16 and checksum modes, negotiated automatically with your client.<\/p>\n\n\n\n<p>If you are transferring binary files that contain 0xFF bytes, toggle <strong>I<\/strong> to enable IAC escaping, which prevents the telnet protocol from misinterpreting data bytes as commands.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">SSH Gateway<\/h2>\n\n\n\n<p>Press <strong>G<\/strong> then <strong>S<\/strong> from the main menu. Enter a hostname, port, username, and password. You get a full interactive shell on the remote machine. For PETSCII and ASCII terminals, the server strips ANSI escape sequences so the output is readable. Press Ctrl+] to disconnect.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"354\" height=\"224\" data-src=\"https:\/\/bryceautomation.com\/wp-content\/uploads\/2026\/04\/image.png\" alt=\"SSH Gateway\" class=\"wp-image-18595 lazyload\" data-srcset=\"https:\/\/bryceautomation.com\/wp-content\/uploads\/2026\/04\/image.png 354w, https:\/\/bryceautomation.com\/wp-content\/uploads\/2026\/04\/image-300x190.png 300w\" data-sizes=\"(max-width: 354px) 100vw, 354px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 354px; --smush-placeholder-aspect-ratio: 354\/224;\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">AI Chat<\/h2>\n\n\n\n<p>Press <strong>A<\/strong> from the main menu. Type a question and the server sends it to the Groq API, displaying the response with pagination. To enable this feature, create a free account at https:\/\/console.groq.com, generate an API key, and add it to <code>xmodem.conf<\/code>:<\/p>\n\n\n\n<p>&#8220;`<br>groq_api_key = gsk_your_key_here<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"431\" height=\"200\" data-src=\"https:\/\/bryceautomation.com\/wp-content\/uploads\/2026\/04\/image-1.png\" alt=\"\" class=\"wp-image-18596 lazyload\" data-srcset=\"https:\/\/bryceautomation.com\/wp-content\/uploads\/2026\/04\/image-1.png 431w, https:\/\/bryceautomation.com\/wp-content\/uploads\/2026\/04\/image-1-300x139.png 300w\" data-sizes=\"(max-width: 431px) 100vw, 431px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 431px; --smush-placeholder-aspect-ratio: 431\/200;\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Security<\/h2>\n\n\n\n<p>Telnet is inherently cleartext. This server is designed for local and private networks only. You can enable username\/password authentication in <code>xmodem.conf<\/code> by setting <code>security_enabled = true<\/code> and configuring your credentials. Failed login attempts are locked out per IP after three tries.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Source<\/h2>\n\n\n\n<p>The project is open source at <a href=\"https:\/\/github.com\/rickybryce\/xmodem-gateway\">my github repository.<\/a> Written by Ricky Bryce with Claude (Anthropic) as co-author.<\/p>\n\n\n\n<p>&#8212; Ricky Bryce<\/p>\n<div id=\"bryce-2448730605\" 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 XMODEM Gateway If you have a Commodore 64, an AltairDuino running CP\/M, or any terminal that speaks telnet, XMODEM Gateway gives you file transfers, SSH access to remote servers, and AI chat &#8212; all from a single telnet connection. I&#8217;ve tested this with IMP8 on the Altairduino. IMP8 is on a a default <a class=\"moretag btn btn-primary\" href=\"https:\/\/bryceautomation.com\/index.php\/2026\/04\/05\/xmodem_gateway\/\">Read More \u00bb<\/a><\/p>\n","protected":false},"author":1,"featured_media":18594,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[763],"tags":[421,959,464],"class_list":{"0":"post-18592","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-altair-8800","8":"tag-altair","9":"tag-file-transfer","10":"tag-xmodem","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>XMODEM Gateway: File Transfers and SSH for Retro Hardware - Bryce Automation<\/title>\n<meta name=\"description\" content=\"Xmodem Gateway: File Transfers and SSH for Retro Hardware. 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