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Experience vintage operating systems, architectures, programming languages and GAMES.

https://icm.museum

#retrocomputing #vintagecomputing #retrogaming #gaming

We’re hosting a PiDP-11/70 Build Workshop in April! Join us for a guided build of your own PiDP-11 and improve your soldering technique through a guided assembly at the museum.

Register at: https://icm.museum/blog/?p=446

#pidp #replica #retrocomputing #vintagecomputing #retrogaming

Check out the cards here:
#^http://floppy.museum/card.pdf
#^http://floppy.museum/cardback.pdf

#Floppy #Retrocomputing #GuerillaMarketing

We currently offer over 28 vintage systems for free remote guest access featuring historic operating systems, programming languages and games. BOOTSTRAP members may request personal accounts on these machines. Thank you for supporting our efforts at https://icm.museum

#vintagecomputing #retrogaming #retrocomputing #history

A workmate rescued and gifted me a book from his dad.

#RetroComputing

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A book titled "Das große Buch zu MS-DOS 6.2" features a blue cover with bold text. It includes topics on DOS 6.2, Windows 3.1, data safety, and various utilities for managing computer systems

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The image shows the back cover of a book titled "Das große Buch zu MS-DOS 6.2." It includes descriptions of various topics related to MS-DOS 6.2, along with a list of features and tools. There are

Thanks to Bruce and Jeff for their hard work getting the Altair 8800 running PGA BASIC in time for the big game! #gohawks #retrocomputing #vintagecomputing

https://icm.museum

April 18th we’re hosting our first PiDP build workshop for experienced beginners/intermediate folks. kit, tools and guidance is provided! Interested?

https://icm.museum

#pidp #kit #soldering #electronics #retrocomputing #vintagecomputing

You asked, you got: Welcome sparcy a Sun SS20 running Solaris 2.6 / SunOS 5.6 is now available in the https://icm.museum Vintage Systems UNiX Cluster. Thanks to RabbitHole Computing for providing the ZuluSCSI #retrocomputing #vintagecomputing

Real hard drives use jumpers ... lots of them.

This is a 520MB SCSI drive with 3 platters but only 5 heads; one of the sides of the platters is dedicated for servo information. It spins at 4500 RPM and has a 256KB cache, which was very good at the time. Streaming reads with a modern controller show it can read at about 2.8MB/sec, which is respectable for an early 1990s drive.

#retrocomputing

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Seagate ST3655N SCSI hard drive label. This is a classic 50 pin SCSI hard drive from the early 1990s.

We just might be the only TOPS-20 site that has continued to operate since the 1990s. We currently run TOPS-20 24/7 on 5 decsystem-20 clones of which 3 allow for remote login. Interested to see TOPS-20 EXEC which influenced the Symbolics LISP Machine?

https://icm.museum

#retrocomputing #vintagecomputing

I bought this board off eBay for the 386EX, but now that I look at it, it appears somewhat interesting.

All those socketed dip chips on the bottom board are ULN2003AN Darlington transistor arrays. They're an open collector design.

The square chips on the left are NEC uPD71055 3x parallel interfaces.

#retrocomputing

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A photo of two PCBs stacked on top of each other - the smaller board is a 386EX single-board computer with ROM, SRAM , watchdog and an RTC. header pins connect it to the board below, which has a bunch of darlington arrays, 6 40 pin headers, and 4 NEC parallel interface chips.

Fools! I was paying $40 per megabyte of RAM back in 1993!

#retrocomputing

This sketch also runs on #DOjS, my #p5js compatible #CreativeCoding platform for #MSDOS.
Only change is that I needed to remove the SVG rendering as that is not supported.

I will make the source available later.

#RetroComputing #JavaScript

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A DOS console code editor showing some JavaScript

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One of the colorful rotational patterns from above

It is not too late to register your Trumpet Winsock.

https://www.tattsoft.com/index.php/sales

#retrocomputing

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the icon for Trumpet Winsock, showing a blue background, yellow pixel-art trumpet, and green letters "TCP"

VCF PNW is back! We are looking for exhibitors and presentations. Get the details at https://vcfpnw.org/ .

#retrocomputing

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Unofficial VCF PNW 2026 Logo.

Dear #retrocomputing #lazyweb

I'm in need of a stand-alone Hayes software modem emulator that I can hook up to a virtual com port with qemu. A pipe, perhaps?

The emulator should let me forward a static number to a particular host:port, or just all numbers to a host:port. Kind of like what dosbox has built in.

It has to be able to take an atdt<digits> and ideally do something reasonable for the various ati commands and such.

Please tell me I don't have to write one myself. 😅

#modem #hayes

I work with nerds.

I traded external personal email addresses with somebody. I sent an email with the subject 'SYN', and got back a reply with SYN-ACK as the subject. Which of course means I had to change the subject again to ACK.

#retrocomputing

More progress on my PC Emulation Book.

I wrote an mdbook plugin to generate tables from CSV references, including a custom syntax that produces in-line links.

So this entire Bios Data Area table is generated from a single line:

{{#csvtable bda.csv}}

#retrocomputing #emulation

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A screenshot of the HTML rendered chapter on the BIOS Data Area from the "PC Emulation Book" in progress. A table of various values of the BDA are shown - the actual information displayed here is not really relevant so forgive me for not stuffing it all in the alt-text.

Was digging around the Wayback Machine to try to find some old Tseng Labs drivers.

Behold their website from 1997. Best web site ever.

#retrocomputing

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a very 90's looking web page for Tseng Labs, makers of PC video cards. The page displays very obvious frames, the right side having a bit-too-photorealistic brick texture background for some reason. "Welcome to Tseng Labs" is spray-painted on with what looks to be MS Paint.

HOLY #%@ I FOUND THE DRIVERS

https://discmaster.textfiles.com/browse/29984/wbiz0000-0009/wbiz0005.tar/wbiz0005/NECGRABD.ARC

Everything's there! Even the CMON and CMOFF utilities that control the Z80 CMII card!

#retrocomputing

If you're running Windows and still using WinImage for handling basic floppy disk images, it is time to retire it. It served us well, but there is now a replacement called DiskImageTool that is superior in every conceivable way and is completely free and open source.

The latest version adds a small drag & drop feature I requested, and it's just the final touch that makes it a perfect replacement for me.

https://github.com/Digitoxin1/DiskImageTool

#retrocomputing #emulation

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A screenshot of DiskImageTool's main interface. An "IMD" image of King's Quest is open. On the left we see a panel of basic disk information and some metadata extracted from the boot sector. On the right we see the contents of the FAT filesystem. Files can be dropped into the right pane to add them to the image.

@hollowone This is a picture from an event I presented at in October. The memory map has separate reserved space for both the CGA and MDA cards. Later EGA and VGA took over the CGA address space, but the MDA address space was left reserved.

These are simple memory mapped devices; software can write to any spot in the memory map to generate text or graphics on the connected display.

You can see the MDA display being used with a debugger to debug the graphics program.

#retrocomputing

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Pair programming an debugging 1990s style. The 80486 based computer has both a VGA card and an MDA card, giving it dual screen capability.

Happiness is buying a $5 eBay card, having it arrive with excellent packaging and it being as described, adding it to your 486, and not having anything go wrong that then requires 3 hours of debugging.

(I added a cheap Hercules clone to my 486 so that I can enjoy dual screens without having to steal an original IBM MDA card from an XT.)

#retrocomputing