Mr Browser – Macintosh Repository file downloader that runs directly on 68k Macs

What is MR Browser?

MR Browser is a small utility app allowing very old Macs from the 90's that are too old to use a normal web browser, but are new enough to connect to the internet through TCP/IP, to access Macintosh Repository online services, e.g. to directly download files without the help of a modern computer.  For now, it's limited to only listing files smaller than 1GB, considering it's only meant to run on mid 90's System 7 environments.

Note: Before downloading files with MR Browser, to prevent crashes, make sure that the hard drive on which it resides has enough free space to account for your downloaded files.

GOT SUGGESTIONS YOU'D LIKE IMPLEMENTED IN MR BROWSER? JUST ASK IN THE COMMENTS BOX BELOW! :)

TROUBLESHOOTING:

If you'd like to use your old Mac's web browser to download MR Browser, then point it to this download link: http://macintoshrepository.org/files/direct/MR-Browser-68K-v0.36.bin (only use this link with your old Mac's web browser as modern ones will think this is a dangerous file and will block it.  It's not dangerous.  It's just because it ends with .bin)

Under the Basilisk II emulator, if you see a "Runtime Failure: Failed Assertion" error popping up after submitting your PIN (right when it does the update check) then just quit the app and re-launch it again.  This likely is an issue with the Basilisk II ethernet proxy and probably will only happen once, the first time you launch MR Browser after a fresh boot.  It's unlikely to happen on subsequent MR Browser uses until you completely exit Basilisk II.

Under Mac OS 9.1 to 9.2.2, if your Mac locks up completely near the end of an update or a .mrb file download, this is caused by not enough RAM being allocated to MR Browser.  You can fix this in the Finder by clicking MR Browser once to highlight it, then in the menu bar at the top, choose FILE > GET INFO > MEMORY and edit the "Preferred Size" field to at least 2200 (more is better) then close the window and then re-launch MR Browser.

MR Browser sys6 & OpenTransport - Please ensure that the "MacTCP DNR" file is in your System Folder's root. It can be copied from another Mac, but should exist with a clean install. Without this file, MRB6, being designed for MacTCP, cannot resolve. This compatibility trick is not present in OS X's Classic Environment and MacTCP-based software will not be able to resolve hostnames.

Change Log

MR Browser sys6 v0.24 (2025-07-04)

• Refactored the chat window redraw procedure to take advantage of the passed event (since v0.22).
• Fixed bug in the chat window click events (the "Send" button and two scroll bars)... now it's less janky!
• Fixed bug where shadowing a window twice and activating it would only redraw the second region.

MR Browser sys6 v0.23 (2025-07-03)

• First release that reports the operating system version and SysEnvirons(6)/GestAlt(7+) mach (model).
• Fixed a bug reporting negative large drive space (mishandled signed 16-bit LongInt would wrap around).

MR Browser sys6 v0.22 (2025-07-02)

• Added time stamps to lines in the log window to make debugging/logging faster and easier.
• Refactored the window redraw procedure to pass the OS event and reduced number of useless redraws.

MR Browser sys6 v0.21 (2025-06-30)

• Added a "Page Info" button in "Browse" that pops a window displaying the given software page description.
• Bumped the max LongString length from 4K to 8K (to allow for long texts, e.g. software page descriptions).
• Software page text (8K characters) is temporarily stored in system heap to fit under global var size of 32KB.
• Bumped min RAM requirement to 520KB.  Note that MRB6 will run with just 180KB without a startup sound.
• Fixed a tiny bug that prevented CMD-W to close the "Browse" window.

MR Browser sys6 v0.20 (2025-06-29)

• MRB6 now prevents you to start a download if you don't have enough free space. Thanks @TheJimmyJames
• Added a stop download button next to the download progress bar when a file is being downloaded.
• Fixed a long standing bug that prevented the welcome alert window to immediately be displayed on launch.
• Fixed a subtle bug: It did not correctly count for the CHR(13) at the end of the first browse downloads line.
• Fixed a bug where if you quit while downloading a file, it would not be released for deletion until a reboot.
• Optimization: Prevent useless perpetual log window status bar refreshes after a download is finished.

MR Browser sys6 v0.19 (2025-06-28)

• Fixed bug: If you opened the about window, closed it, then re-opened it again, the icon would be corrupted.
• Fixed bug: Alert window telling you that MacTCP could not be initialized was not drawn correctly.
• Improved performance of the wavy "MR Browser" text animation in the about window.

MR Browser sys6 v0.18 (2025-06-27)

• Fixed recently introduced bug: Checkmark menu item was drawn on "Close Window" instead of "Save PIN".
• Minor touches to the MRB6 icon (all sizes).
• Finally added an about MRB6 window showing the currently running version number... It's about time!

MR Browser sys6 v0.17 (2025-06-24)

• Fixed bug allowing the user to select a page row and "download" that ID (leads to a random download file).
• Page rows are now drawn in bold and can use all the row width.
• First release to be aware of the current volume free space.

MR Browser sys6 v0.16 (2025-06-23)

• First release that can search and download files.  Files are saved next to MRB6 in its execution folder.
• When you're already downloading a file, it prevents you from accidentally starting a second one in parallel.

MR Browser sys6 v0.15 (2025-06-21)

• Uniformly relaxed time out to 10 seconds, because on 8mhz computers, 5 seconds is a tad too quickly elapsed.
• Testing a 4K (instead of 2K) TCP reception buffer, which should slightly improve performance on very old Macs.
• Reduced pressure on the system heap by reusing the same 1K array variable when appending lines to the log.
• Obfuscated PIN in the log window, because now that we know that it's always valid, it's useless to show it in full.
• Fixed a minor graphical glitch: Users list scroll bar was not drawn as disabled when the window was in the back.
• Fixed a minor graphical glitch: Send button was not drawn as disabled when the window was in the back.

MR Browser sys6 v0.14 (2025-06-20)

• Added autoKey to the events loop to be able to delete long text (e.g. a sentence) in a more standard/normal way.
• Reduced pressure on the system heap by reusing the same 8K array variable when appending lines to the chat.
• Refactored the UpdatePullHTTP procedure into a status returning function (easier to write to the log window).
• Ensure properly closing (AND releasing!) finished TCP connections every time to prevent memory exhaustion.
• Improved the accuracy of the TCP reception time out and uniformly relaxed it to 5 seconds.
• Fixed a minor graphical glitch: Text refreshes (e.g. chat) would sometimes clear regions in the wrong window.

MR Browser sys6 v0.13 (2025-06-19)

• Fixed a nasty bug that always reassigned the same TCP connection, including mixing chat with binary downloads.
• Fixed a compiler directive misorder that silently disabled bound checking permanently after the first TCP reception.
• Added a missing compiler directive in the file streaming (downloads) TCP reception function to speed it up a little bit.

Version 0.36 (2025-06-18)

• Added an alert message + 5 second counter to detect when download connection has silently become stale (inactive).

MR Browser sys6 v0.12 (2025-06-17)

• Optimized TCP reception performance by implementing our own loop instead of also using loop in TCPStuff.unit
• Now aware of the expected file download size upon start by parsing a Content-Length-MRB6 HTTP header.
• Added a real time progress bar and status text to the log window to show current download progress.
• Added a chat command to test downloading a "large" (8MB) .sit file: /test-large-download

MR Browser sys6 v0.11 (2025-06-16)

• Added a function to detect the absolute path to the folder that the app runs from.
• Added async sound playback functionality and refactored some exit code to quit the app in a cleaner way.
• If it exists, plays a 11Khz PCM system sound sibling file named "modemhandshake" at launch. Thanks @chrisfriberg
• Fixed a nasty byte alignment bug with file streaming (downloads) introduced in v0.10.  Now it's fixed!

MR Browser sys6 v0.10 (2025-06-15)

• First release that can download the MRB6 update file from the MR server.
• Added "Download MRB6 update..." to the Apple menu for quick and easy update access.
• Added a function to be able to set type/creator codes on downloaded files.

MR Browser sys6 v0.09 (2025-06-14)

• Rethought + refactored the TCP reception code, so that it's a stateful procedure, paired with a record + a queue.
• Moved the TCP reception handling to the main events loop, reducing (not entirely removing) momentary UI freezes.
• As of now, up to 1 extra HTTP request can be queued at a time (and then a adding a new one would replace it).
• Fixed the MacTCP loading window that did not draw/repaint informational text correctly.

MR Browser sys6 v0.08 (2025-06-11)

• Added complex function to scan boot volume, find System Folder > Preferences folder and write a pref file.
• Added a pref file reading function with a very simple pref file format allowing to save/forget PIN.
• Added a file menu item to save your PIN (to forget it, select the menu item again to remove the checkmark).

MR Browser sys6 v0.07 (2025-06-10)

• Added GestAlt functionality to poll for the user's System version (is shown in the log window).
• Added a 5 seconds time out so that the chat doesn't hang indefinitely when there are network issues.
• Added a login screen repaint/update event and a select window call to try to fix @WartyMN graphics glitch.
• Displays a reason why chat messages refresh fails, e.g. DNS resolution failure or download time out.
• Converted the str255 var used for MacTCP GET headers/requests to a dynamic 8K buffer to prevent overflows.
• Fixed the URL encoding of the whole extended ASCII table, preventing invalid HTTP requests, resulting in Error 400.
• Fixed automated message truncation (max 220 chars) to prevent a buffer overflow, resulting in an invalid HTTP request.
• Fixed a crash when quitting under System 6 if you did not have MacTCP installed (e.g. in Mini vMac).
• Fixed the Apple menu logo in the top/left corner, now it's displaying properly under System 6 and in color in >= 7.0.

MR Browser sys6 v0.06 (2025-06-09)

• Added a scrollable users list to the chat window (for now, refresh it manually by just clicking the "Send" button).
• Fixed a possible buffer corruption where the last line (or few characters) could be repeated at the end of a request.
• QoL update to prevent the chat window (or any other window) to accidentally be shrunk too small.

MR Browser sys6 v0.05 (2025-06-08)

• Fixed a bug: After posting a message, the next few messages would not load automatically.
• QoL update on the login screen, allowing RETURN or ENTER key instead of having to click on SUBMIT. Thanks @WartyMN

MR Browser sys6 v0.04 (2025-06-08)

• After more than 2 years on pause, the project emerged again and "MRB6" is now being kicked into a solid MR app!
• Works on all 68K Macs that support MacTCP (realistically System 6.0.7 or newer).  Try on a Mac Plus from 1986!
• Added functionality: Read the chat with [CMD-1] (click "Send" without typing a message to get new messages).
• Added functionality: Post messages in the chat.
• Lots of work has been done with window events, window repainting, scroll bar manipulations, etc...

Version 0.35 (2025-03-23)

• CMD-i on any server file row now pops up the parent software's info window (description, compatibility notes, screenshots).
• Thanks @j0celyn for suggesting this functionality.
• Prevent a crash when users spam the ENTER key or click the "Find" button immediately after signing in.
• Fixed screenshots not displaying under certain circumstances (mostly from within RealBasic itself, when debugging)

Version 0.34 (2025-03-19)

• Fixed a glitch found with @Performaguy1's Performa 460 that sends very broken gestalt codes resulting in 400 errors.
• Fixed a bug when you move your downloads folder and restart MR Browser, the alert dialog was stuck in the background.
• Thanks @eaglebtc for reporting this bug.

Version 0.33 (2025-02-22)

• QoL update adding a minor functionality: The downloads folder can be set by the user (it's also saved/loaded in prefs).
• Thanks @CraZyP for suggesting this functionality.
• Note: You can only use that feature if the downloads queue is empty to prevent an obvious crash.

Version 0.32 (2024-09-08)

• QoL update adding a minor functionality: Main (browser) and chat window sizes/positions are now saved/loaded in prefs.
• Thanks @Spiffycaius for suggesting this functionality.
• Note: If you change resolutions in a way that makes it unusable, just uncheck the auto sign in checkbox to reset the prefs.

Version 0.31 (2024-09-06)

• QoL update with adjustments such as saving/loading all the chat user defined colors and font size in the preferences file.
• Thanks @Spiffycaius for suggesting to save/load chat user defined colors in the preferences file.
• Added more larger font sizes to the chat settings drop down menu.
• Javascript pollution is no longer printed as raw text in MR Browser.  Instead, only [script] will appear in place of javascript.
• Fixed chat user defined colors not being used under non-picture enabled chat (68K).  This was supposed to be in v0.30.
• Fixed a little display glitch on the right side of the messages box under non-picture enabled chat (68K) introduced in v0.30.
• Fixed glitch, incorrect VIP users color in the messages box under non-picture enabled chat (68K) introduced in v0.30.
• Note: Prefs format changed in v0.31 so you will have to re-enter your PIN if you use v0.31 then downgrade to older versions.

Version 0.30 (2024-08-29)

• QoL update with cosmetic adjustments such as a prefs panel in top/left corner of the chat to set the font size/color in real time.
• Adjusted the chat picture mode's black border lines that were missing at the top and bottom of the canvas.
• Adjusted the collapsible users list on the right hand of the chat, so that it properly redraws the picture mode chat canvas.
• You can now scroll the chat picture mode's messages canvas by clicking on it and dragging up/down, sorry no mouse wheel.
• Thanks @NCC for suggesting this: After opening the chat window, hit the chat menu again (or ⌘1) to enable "chat only" mode.
• Fixed a bug introduced in v0.28 and not fixed in v.029 that could potentially crash downloads, including the MR Browser updater.

Version 0.29 (2024-08-25)

• Benchmarked methods of loading/displaying chat pictures, then improved loading + (re)painting speeds as well as RAM usage.
• MR Browser now requires QuickTime in order to display chat pictures which allows for faster loading and less RAM usage.
• MR Browser now requires to write cache files to the boot volume for chat pictures, so make sure it's unlocked (on PPC).
• Fixed regression issue where 68K Macs were printing pictures as raw binary/text DATA in chat, instead of ignoring them.
• Fixed regression bug where all nicknames in chat would be blue, regardless of status (e.g. donators) instead of some being red.

Version 0.28 (2024-08-24)

• Buggy release, please do not use.
• Preliminary (not finished) work to get pictures displaying in the chat under PowerPC.  Expect lag and possibly crashes in this build.
• Mac OS 8.0 is the current minimum version to support inline pictures in chat until a more reliable PPC detection method is found.
• Performance improvement when downloading large DATA (such as pictures and/or lots of messages at once) in chat.
• This version downloads messages up to 32KB and/or up to a picture, then pauses, then resumes another messages chunk.
• This version probes twice in a row for new chat messages, then refreshes the users list once, then repeats that cycle.

Version 0.24, 0.25, 0.26 & 0.27 (2024-03-10)

• Fixed a graphics glitch that occurred on some buttons (e.g. "Sign in") under some B&W screens (e.g. Mac SE/30).
• Thanks @mikelord68 for reporting this after trying it on your SE/30 and testing out experimental MR Browser fixes.

Version 0.23 (2024-03-10)

• Fixed a sneaky bug that would recently make the chat always reload the whole transcript instead of just appending new messages.

Version 0.22 (2023-10-22)

• Added the "Full Screen Mode" menu item, allowing to instantly switch the main window between full screen and windowed mode.
• Thanks @Xenocide for suggesting this feature.

Version 0.21 (2022-12-18)

• Added the "Expand .mrb file..." menu item, useful for .mrb files without a proper type/creator code (downloaded from the internet).
• Fixed a long standing bug: MR Browser crashed when dragging an icon/window for more than 5 seconds while downloading files.
• Fixed a typo in the help/instructions window.

Version 0.20 (2022-12-15)

• Thanks @Xenocide for reporting the issue where chat text was jumping back to the top on new messages.  Fixed.
• Thanks @OxYGeN for reporting a cosmetic issue (connection time out message was too large to display in whole).  Fixed.

Version sys6 v0.01 (2022-11-08)

• First release for 68000 (B&W) Macs. Works on any Mac running System 6.x (512Ke and up).  Requires MacTCP (included).

Version 0.19 (2022-10-21)

• Thanks @Sukaro for reporting a >= Mac OS 9.1 issue, requires more RAM allocated otherwise locks up on update (caused by MMU).
• MR Browser now checks if it runs under >= Mac OS 9.1 and attempts to auto-increase its RAM allocation then re-launches itself.

Version 0.18 (2022-10-21)

• This version (0.18) is the first to have an implementation of the MR real time chat! You can only post 1KB of text at once.
• Pictures, video embeds and other HTML objects are all stripped from the chat, only raw text is sent to MR Browser.
• Beginning of chat transcript is constantly cleaned so that it holds no more than 12K characters at any time (low RAM usage).
• Fixed a bug, when the sign in connection timed out, it would remove the PIN from the field and proceed, now behaves as it should.
• Fixed a soft lock that could happen if the sign in connection timed out BUT finally succeeded after the time error window popped up.
• Fixed a NIL exception crash if the user quit the app less than 1 second after the main full screen window (after sign in) popped up.

Version 0.17 (2022-10-17)

• Thanks @Aeolus85 for reporting a runtime error under System 7.6, just before the update check, probably fixed in this release.
• Introduced a 1 second delay after the main full screen window is opened and before the updater socket connects.

Version 0.16 (2022-10-15)

• Thanks @Sukaro for suggesting: MR Browser now allows users to save their PIN to a preferences file so it auto-signs in on launch.

Version 0.15 (2022-10-12)

• Added a quick links menu near the FIND button, allowing users to instantly get System 6, 7 and Mac OS 8 install floppy disk images.
• Added a macro-ish functionality that allows to auto-search and auto-download files based on their filename (for quick links menu).
• Fixed a crash that could potentially happen while downloading .mrb files if the system was busy/halted for more than 1 second.

Version 0.14 (2022-10-11)

• This version (0.14) is now the lowest that is supported, due to an unavoidable change in the .mrb file format (.mrb size checksum).
• When QuickTime 3 is not installed, asks user to auto-download the QuickTime 3.0.2 installer as .mrb (no need for Stuffit or Toast).
• Fixed regression bug introduced in v0.11, incompletely downloaded .mrb files don't result in wrong error displayed anymore.

Version 0.13 (2022-10-09)

• Detects QuickTime version and if older than 3.0, gracefully downgrades to bitmap screenshots, requiring no QuickTime at all.
• Before downloading screenshots, checks if we're on a locked or low free space volume, prevents crashing by showing an error.

Version 0.12 (2022-10-09)

• Screenshots carousel (KB arrows supported) thru the MORE INFO window; pics auto-resized on server to 400x300 GIF.
• Warning: Viewing screenshots (as GIF) requires QuickTime 3.0 or newer, otherwise it'll display an error.

Version 0.11 (2022-10-07)

• Disk space is pre-allocated on app's volume before downloading to prevent incomplete downloads when not enough disk space.
• Disk space is pre-allocated on app's volume before decoding .mrb files to prevent a misguiding error when out of free space.
• Fixed regression bug re-introduced in v0.08, queueing the same file for download multiple times is no longer possible.
• Warning: Regression bug: Incompletely downloaded .mrb files will result in "not enough RAM" error instead of "incomplete file".

Version 0.10 (2022-10-05)

• Fixed regression bug re-introduced in v0.08, app can no longer crash when downloading files w/ name >= 30 chars long.

Version 0.09 (2022-10-05)

• Fixed a bug in the .mrb encoder/decoder that prevented large files to be decoded properly. Max size now = 999,999,999 bytes.

Version 0.08 (2022-10-05)

• The server files browser list now also shows the software page ID in the (previously named) FILE ID column.
• On the left of software page entries (italic) there's now a tiny button that pops up a MORE INFO window (description).
• All communications time out threshold is now 12 seconds to prevent false positives on very slow internet (e.g. 56K modem).
• Warning: Regression bug: App might crash when downloading files w/ name having >= 30 characters long.
• Warning: Regression bug: Queueing the same file for download multiple times is possible when it should not.

Version 0.07 (2022-10-04)

• Slightly improved the .mrb file type BNDL to include the tiny 16x16 icon set, shown in the Finder under a folder list view.
• Reports basic and anonymous Gestalt DATA such as the Mac model and Mac OS version for usage stats and debugging.

Version 0.06 (2022-10-02)

• Shuffled code around, reduced RAM usage when decoding .mrb archives and now they can be opened from Finder to decode.
• Made a custom Finder icon for .mrb files :)
• Note: If you run out of RAM while applying an update (or decoding a .mrb file) just quit MR Browser and double click the .mrb file.

Version 0.05 (2022-10-01)

• Improved the version updater, it asks if you want the update, auto-downloads and re-launches the new MR Browser afterwards.
• Now warns the user when running out of RAM to fully decode a .mrb file instead of silently leaving the user with an useless file.
• Slightly modified the .mrb archive format to embed the original file name, instead of assuming it's based on the .mrb file name.
• Slightly modified the .mrb archive format to embed the original file size, which is used as a basic checksum when decoding it.
• .mrb archives are now automatically deleted by MR Browser immediately after they've been decoded (both success or failure).
• Note: The .mrb decoder still needs a couple more tweaks, namely to reduce the amount of RAM required... due next release.

Version 0.04 (2022-09-30)

• Added a resource fork to binary encoder/decoder, allowing to download .mrb Mac executables without requiring Stuffit Expander.
• Added a version update check after signing in.  It will warn you once per session if there's a new release available for download.
• .mrb files are automatically decoded to executables upon download completion for a smooth, seamless experience :)

Version 0.03 (2022-09-29)

• Added a help/instructions screen, accessible from the FILE menu (or via the CMD-H keyboard shortcut).
• Added first and last 4 SHA1 hash digits to each listed file to help users quickly find out if a download failed.
• Queued (and in progress) downloads can now be canceled/removed at any moment by pressing the DELETE or BACKSPACE key.
• Download progress (%) is now shown with a higher precision to help see progress is being made on large files (0.1% instead of 0%).
• Added a (lol) responsive-ish design so that the queued downloads list properly shows all information properly even on 512px screens.
• Added an intelligent pre-queuing check that prevents the user from adding the same download file twice.
• Fixed the bug that crashed the app when downloading a file that has a name longer than 31 characters.

Version 0.02 (2022-09-28)

• Initial public release, lets a member sign in, search and download files.
• Warning: There's a bug that will crash this release if you attempt to download a file that's more than 31 characters long (e.g. a long named OSX DMG file).

Download MR Browser for Mac MR-Browser-68K-v0.36.sit (455.72 KiB / 466.66 KB)
MR Browser 68K v0.36 / compressed w/ Stuffit

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MR-Browser-68K-v0.03.sit

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MR-Browser-68K-v0.02.sit

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MR-Browser-v0-19.dsk.zip

126 / 2022-10-29 / 5edea7a420ccc11715c7002a2469585878edb448 / /

MR-Browser-Sys6-v0-01.dsk.zip

343 / 2022-11-08 / 2025-06-06 / 136bde8866ade39f3923340b0540d6893d6ad97c / /

MRB6-v0-04.dsk.zip

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MRB6-v0-05.dsk.zip

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MRB6-v0-06.dsk.zip

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MRB6-v0-07.dsk.zip

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MRB6-v0-08.dsk.zip

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MRB6-v0-09.dsk.zip

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MRB6-v0-10.dsk.zip

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MRB6-v0-11.dsk.zip

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MRB6-v0-13.dsk.zip

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MRB6-v0-14.dsk.zip

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MRB6-v0-15.dsk.zip

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MRB6-v0-16.dsk.zip

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MRB6-v0-17.dsk.zip

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MRB6-v0-18.dsk.zip

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MRB6-v0-19.dsk.zip

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MRB6-v0-20.dsk.zip

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MRB6-v0-21.dsk.zip

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MRB6-v0-22.dsk.zip

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MRB6-v0-23.dsk.zip

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MRB6-v0-24.dsk.zip

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Architecture

Motorola 68K

System Requirements

From Mac OS 6.0 up to Mac OS 9.2

Compatibility notes

MR Browser sys6 :

Architecture: 68K (68000 or newer, could work under PPC too, but it's pointless, use MR Browser 68K instead)

At least 157KB of free RAM (lol, yup)

System 6.0.7 - Mac OS 9.2.2

Note: You need the MacTCP control panel installed and configured with a valid IP address.

-------------------------------

MR Browser 68K :

Architecture: 68K (68020 or newer) or PPC

At least 1.6MB of free RAM (recommended 3MB or even more for chat pictures, if it freezes, allocate more RAM)

System 7.x - Mac OS 9.2.2

Note: You need a color (68020 or newer) Macintosh with TCP/IP (NOT MacTCP!) internet connectivity to run this, so any 68K or PowerPC Mac starting from the Macintosh II running System 7.0 or newer should work.

Note: QuickTime 3.0 or newer is highly recommended to view GIF screenshots and chat pictures, but a fallback (slower) is in place to get bitmap screenshots when QuickTime 3 or newer is not installed.  Chat pictures will not work without QuickTime.

Emulating this? It could probably run under: Basilisk II