--- title: (C2SLFF4 | daily.dev description: A deep dive into the mysterious first line of the 1980 BASIC game The Wizard's Castle, originally written for the Exidy Sorcerer microcomputer. The cryptic REM... canonical: https://daily.dev/posts/c2slff4-tzxn2doqg twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: (C2SLFF4 | daily.dev og:description: A deep dive into the mysterious first line of the 1980 BASIC game The Wizard's Castle, originally written for the Exidy Sorcerer microcomputer. The cryptic REM... og:url: https://daily.dev/posts/c2slff4-tzxn2doqg og:image: https://api.daily.dev/og/posts/TzXN2doqG.png og:image:alt: (C2SLFF4 og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # (C2SLFF4 **[Beej's Blog](https://daily.dev/sources/beej)** · 16 min read · 0 upvotes · 0 comments ## Summary A deep dive into the mysterious first line of the 1980 BASIC game The Wizard's Castle, originally written for the Exidy Sorcerer microcomputer. The cryptic REM statement `"_(C2SLFF4` turns out to be Z80 machine code embedded directly in a BASIC comment. The code reads the Z80 R register (which increments on every instruction fetch) to generate a pseudo-random seed, stores it in the memory-mapped screen address 0xF7FF, and then BASIC's PEEK reads it back to seed the PRNG. The investigation reveals that the printed ASCII characters in the magazine listing don't correspond to actual ASCII bytes — the Sorcerer BASIC interpreter maps certain byte values to multi-character display strings, meaning anyone who typed the listing from the magazine would have gotten non-functional code. The author likely POKEd the machine code in directly rather than typing it. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [\(C2SLFF4](https://daily.dev/posts/c2slff4-on4pfnbag) · Hacker News · 0 upvotes · 0 comments - [BASICally, Its Retro Machine Language](https://daily.dev/posts/basically-its-retro-machine-language-06cdyyh22) · Hackaday · 0 upvotes · 0 comments - [Diving into Retro Computing with the Amstrad PCW 8256](https://daily.dev/posts/diving-into-retro-computing-with-the-amstrad-pcw-8256-yksnkio8j) · Scott Logic · 0 upvotes · 0 comments --- Tags: [#reverse-engineering](https://daily.dev/tags/reverse-engineering) [View this post on daily.dev](https://daily.dev/posts/c2slff4-tzxn2doqg) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"(C2SLFF4","url":"https://daily.dev/posts/c2slff4-tzxn2doqg","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/c2slff4-tzxn2doqg"},"datePublished":"2026-07-21T22:34:11.952Z","dateModified":"2026-07-21T22:34:36.376Z","description":"A deep dive into the mysterious first line of the 1980 BASIC game The Wizard's Castle, originally written for the Exidy Sorcerer microcomputer. 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