OS/emulator developer and OS historian. Developer of UX/RT, an open-source QNX-like OS. Curator of the Virtual OS Museum, the world's largest collection of pre-installed emulated OSes: https://virtualosmuseum.org/https://bsky.app/profile/andreww591.bsky.socialhttps://bsky.app/profile/andreww591.bsky.social/post/3mvu6tyl5fs27Also added DX-DOS for the Elektronika BK, a Soviet home computer based on the K1801VM1 PDP-11-compatible microprocessor. While most of the various OSes for these machines somewhat resemble MS-DOS, DX-DOS is the only one of which I am aware that is more or less a true MS-DOS clone19 Sep 2026 07:45 +0000at://did:plc:6rd6yrryk45652csziydmpx7/app.bsky.feed.post/3mvu6tyl5fs27https://bsky.app/profile/andreww591.bsky.social/post/3mvu5lilmk227Added BOSS/IX for the MAI Basic Four System 2000, a 68k-based office computer from the 80s. This is a modified distribution of UNOS, a Unix-like RTOS that was ported to various 68k machines. A port of MAI Business Basic is included19 Sep 2026 07:22 +0000at://did:plc:6rd6yrryk45652csziydmpx7/app.bsky.feed.post/3mvu5lilmk227https://bsky.app/profile/andreww591.bsky.social/post/3mvhz2lgqmc2gAdded Tektronix's distribution of UniFLEX/68k for the 4400 "AI workstations"14 Sep 2026 11:29 +0000at://did:plc:6rd6yrryk45652csziydmpx7/app.bsky.feed.post/3mvhz2lgqmc2ghttps://bsky.app/profile/andreww591.bsky.social/post/3mv3gasjmts23Installed SINTRAN III for the Norsk Data ND-100 minicomputer; this is a real-time and timesharing OS that's kind of comparable to RSX or RTE; unusually, it allows abbreviating filenames in addition to commands09 Sep 2026 11:21 +0000at://did:plc:6rd6yrryk45652csziydmpx7/app.bsky.feed.post/3mv3gasjmts23https://bsky.app/profile/andreww591.bsky.social/post/3muy4rr4rcc26Added a few new OSes to the OS museum repository (available as updates; they aren't yet in the base VM). First off is fox32os, the official OS for the fox32 fantasy computer, which is modelled on early Macs and has a vaguely 68k-like CPU08 Sep 2026 03:54 +0000at://did:plc:6rd6yrryk45652csziydmpx7/app.bsky.feed.post/3muy4rr4rcc26https://bsky.app/profile/andreww591.bsky.social/post/3mu4t43r5qc2vReleased a new Virtual OS Museum image including all of the installations I'd added earlier, plus updated A/UX images (the old Shoebill images have been replaced with MAME ones, and the 3.1.1 QEMU image has some minor fixes) virtualosmuseum.org28 Aug 2026 07:18 +0000at://did:plc:6rd6yrryk45652csziydmpx7/app.bsky.feed.post/3mu4t43r5qc2vhttps://bsky.app/profile/andreww591.bsky.social/post/3mscuthdsns2nI've released a UX/RT demo image. It includes banner and Hunt the Wumpus from the BSD games package, and runs from the filesystem built into the boot image (no disk filesystem support yet) uxrt.org youtu.be/AVrGQYPbGco https://andreww591.blogspot.com/2026/08/my-own-os-uxrt-now-runs-shell.html05 Aug 2026 06:15 +0000at://did:plc:6rd6yrryk45652csziydmpx7/app.bsky.feed.post/3mscuthdsns2nhttps://bsky.app/profile/andreww591.bsky.social/post/3mr3ft7snlc2gGot sash working a bit better under UX/RT. Had to fix various issues (mostly filesystem-related) that I didn't catch with the previous hardcoded tests20 Jul 2026 13:33 +0000at://did:plc:6rd6yrryk45652csziydmpx7/app.bsky.feed.post/3mr3ft7snlc2ghttps://bsky.app/profile/andreww591.bsky.social/post/3mqiw4kujps23UX/RT finally runs a shell, although many of the commands are currently broken. Once I get more of them working I will release a proof-of-concept binary image and add it to the OS museum.13 Jul 2026 05:04 +0000at://did:plc:6rd6yrryk45652csziydmpx7/app.bsky.feed.post/3mqiw4kujps23https://bsky.app/profile/andreww591.bsky.social/post/3mqc46mfmrs2iInstalled the KERNAL for the Commodore LCD, an abandoned prototype laptop based on somewhat similar hardware and software to their other 8-bit machines, although unlike their other machines it boots into a TUI shell instead of straight into BASIC10 Jul 2026 12:03 +0000at://did:plc:6rd6yrryk45652csziydmpx7/app.bsky.feed.post/3mqc46mfmrs2ihttps://bsky.app/profile/andreww591.bsky.social/post/3mpuyjhj3dk26Added EDX, one of the OSes for the IBM Series/1 minicomputer, to the OS museum05 Jul 2026 06:53 +0000at://did:plc:6rd6yrryk45652csziydmpx7/app.bsky.feed.post/3mpuyjhj3dk26https://bsky.app/profile/andreww591.bsky.social/post/3mp5lwbad3c22UX/RT now runs a test program that makes a few VFS calls25 Jun 2026 23:37 +0000at://did:plc:6rd6yrryk45652csziydmpx7/app.bsky.feed.post/3mp5lwbad3c22https://bsky.app/profile/andreww591.bsky.social/post/3mp5l7uj4d222Added EOS 3, a German CP/M-compatible OS for the Sharp MZ-350025 Jun 2026 23:24 +0000at://did:plc:6rd6yrryk45652csziydmpx7/app.bsky.feed.post/3mp5l7uj4d222https://bsky.app/profile/andreww591.bsky.social/post/3mozclkmbec26I've also managed to get UX/RT running some dummy user programs (one hangs, and the other tries to jump to 0xdeadbeef to produce a distinctive fault)24 Jun 2026 06:39 +0000at://did:plc:6rd6yrryk45652csziydmpx7/app.bsky.feed.post/3mozclkmbec26https://bsky.app/profile/andreww591.bsky.social/post/3mozb5lilic26Added UniPlus+ SVR2 for the Torch Triple X, a low-end 68010-based workstation roughly comparable to the AT&T Unix PC and contemporary with it24 Jun 2026 06:13 +0000at://did:plc:6rd6yrryk45652csziydmpx7/app.bsky.feed.post/3mozb5lilic26https://bsky.app/profile/andreww591.bsky.social/post/3mozajwckgc26Added MPL OS, a Unix-like hobby OS for the X68000 (which uses executables in Human68k format)24 Jun 2026 06:02 +0000at://did:plc:6rd6yrryk45652csziydmpx7/app.bsky.feed.post/3mozajwckgc26https://bsky.app/profile/andreww591.bsky.social/post/3mo3wxtjxdc22I've also released an updated version of the base OS museum VM, which includes all the new installations, as well as enabling 4-core SMP for QEMU (which I somehow forgot before). The jumpy pointer with OpenGL has been fixed as well (by disabling the "hardware" cursor)12 Jun 2026 14:24 +0000at://did:plc:6rd6yrryk45652csziydmpx7/app.bsky.feed.post/3mo3wxtjxdc22https://bsky.app/profile/andreww591.bsky.social/post/3mo3wquad6c22I've also updated both IRIX images (5.3 and 6.5.22m) to run in IRIS, which is at least an order of magnitude faster than MAME, and is actually usable even on a relatively slow host, unlike MAME, which was basically a slideshow on my main PC (which is quite old)12 Jun 2026 14:20 +0000at://did:plc:6rd6yrryk45652csziydmpx7/app.bsky.feed.post/3mo3wquad6c22https://bsky.app/profile/andreww591.bsky.social/post/3mo3vyaudos22Also installed OPUS for the Litton EBS 1231, which was a very low-end office computer from the late 60s and early 70s, from what was formerly Royal McBee, better known for the LGP/RPC machines12 Jun 2026 14:06 +0000at://did:plc:6rd6yrryk45652csziydmpx7/app.bsky.feed.post/3mo3vyaudos22https://bsky.app/profile/andreww591.bsky.social/post/3mo3vqnjpss22Added plusBASIC for the Aquarius+ to the OS museum. The Aquarius+ is a modern enhanced clone of the short-lived Mattel Aquarius home computer, based on a Z80, an FPGA for I/O devices, and an ESP3212 Jun 2026 14:02 +0000at://did:plc:6rd6yrryk45652csziydmpx7/app.bsky.feed.post/3mo3vqnjpss22https://bsky.app/profile/andreww591.bsky.social/post/3mnqlwy34fc2dAdded J OS 051231 to the OS museum. This is the second-oldest version of TempleOS available as a disk image, dating back to the end of 2005, long before it was called TempleOS08 Jun 2026 02:07 +0000at://did:plc:6rd6yrryk45652csziydmpx7/app.bsky.feed.post/3mnqlwy34fc2dhttps://bsky.app/profile/andreww591.bsky.social/post/3mnlgntwxq22iStarted adding new OS images to the Virtual OS Museum. First is Unite, a QNX-like OS from the late 80s and early 90s, somewhat resembling a 32-bit version of QNX 2 (predating 32-bit support in QNX itself by several years), although it's not a direct clone https://jacquesmattheij.com/unite-operating-system/06 Jun 2026 00:49 +0000at://did:plc:6rd6yrryk45652csziydmpx7/app.bsky.feed.post/3mnlgntwxq22ihttps://bsky.app/profile/andreww591.bsky.social/post/3mncradvluc27A new bug fix release of the Virtual OS Museum is now available. No new installations yet, but I've fixed most of the issues people were having virtualosmuseum.org youtu.be/J7qbblRw5JY https://andreww591.blogspot.com/2026/06/a-new-bug-fix-release-of-virtual-os.html https://virtualosmuseum.org/02 Jun 2026 14:05 +0000at://did:plc:6rd6yrryk45652csziydmpx7/app.bsky.feed.post/3mncradvluc27https://bsky.app/profile/andreww591.bsky.social/post/3mmbxagrlg22eOther people have already posted about it here, but I have now released the Virtual OS Museum. Sorry for the issues with downloads before; the server I was hosting it on had a failing drive. I now have torrents and direct downloads from archive.org linked on the site virtualosmuseum.org https://virtualosmuseum.org/20 May 2026 12:54 +0000at://did:plc:6rd6yrryk45652csziydmpx7/app.bsky.feed.post/3mmbxagrlg22ehttps://bsky.app/profile/andreww591.bsky.social/post/3lqw4ugda2e27Decided I'd make a Bluesky account. Currently I am working on getting UX/RT (https://gitlab.com/uxrt/uxrt-toplevel) to the point where it runs a shell, as well as writing a GUI launcher and a site for the Virtual OS Museum (virtualosmuseum.org). I am hoping to have both done within the coming few months06 Jun 2025 05:43 +0000at://did:plc:6rd6yrryk45652csziydmpx7/app.bsky.feed.post/3lqw4ugda2e27