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What do you mean by "standard"? VGA? Composite?

If you're using an MFM/RLL drive and are upset about losing that last cylinder or two, then you can simply specify a higher number of cylinders when formatting the drive to make up for it. For example, the ST-225 officially has 615 cylinders, but is physically capable of stepping to at least 663...

The trademark for "MS-DOS" is up for renewal this year. It was last renewed in 2014 for a 10-year period: https://tsdr.uspto.gov/#caseNumber=73470443&caseSearchType=US_APPLICATION&caseType=DEFAULT&searchType=statusSearch

It requires some kind of special interface board, which it may be useless without. The external DB37 port of the IBM 5150/5160 floppy drive controller does not supply power through the connector. Neither does the external floppy port of the Tandy 1400 series laptops.

The OS/2 Museum has a good article about what went wrong with DOS 4.0/4.01: https://www.os2museum.com/wp/dos/dos-4-0/ I was also disappointed because I thought Microsoft had released the code for the rare multitasking version of DOS 4.0, but it just turned out to be plain DOS 4.0.

I noticed the comment "8/5/83 ARR IBM MAKES HARDWARE CHANGE. NOW WANTS TO USE HALF HIGHT DRIVES FOR HAL0, AND BACK FIT FOR PC/PC XT" Was "hal0" an early code name for the PCjr?

Here's a video of the versions of Tetris and Turnabout (Reversi) for the Brother Super PowerNote series:

I do have an XT clone power supply with a single 12-pin connector, but it takes a lot of force to plug in. So maybe that's one of the reasons why they split it up.

While we're being nit-picky, Microsoft also incorrectly referred to 360K disks as "low density":

Turns out the Model M was quite the problem child for Leading Edge and Mitsubishi:

They were also called "sewing machine" portables, because the size, weight, and appearance is similar to a portable sewing machine in its case.

The 5155 would be an awfully big and heavy suitcase. When I saw "suitcase portable" I thought of the PS/2 Model P70 or P75.

What kind of "IBM PC clone" is this that has ISA slot(s) but maxes out at 128K of RAM on the motherboard? An original Tandy 1000?

I also don't get the disdain for considering 2000s systems to be vintage. It's not like we're fixed to a 30-year timespan, and thus allowing in PCs from 2005 will automatically cause your 1975 Altair to be forgotten. And it's not like it would lead to a massive influx of new users here anyway...

It's not like there is a whole lot of Mac activity here anyway, since there are other, more popular forums which cover Macs exclusively.

I think all pre-Intel Macs are suitably "vintage" by this point. Some of the last PowerPC systems may be of the same age as a Core 2 Duo, but unlike the C2D they have absolutely no hope of running any modern operating systems or software.

So what 386/486 system used quad-density 720K 5.25" floppy drives? That's really odd.

I rarely dive into the individual forum categories. I just click on "What's new" and then read any thread that catches my interest, regardless of where it was posted.

Which version? I never had a problem running IBM Diagnostics on a generic clone. In fact, aftermarket VGA cards all have "IBM" in their BIOS to make sure it would pass IBM's VGA diagnostics.

I fully understand that, having used a typewriter that was missing the 1 and 0 keys because it expected l and O to serve double-purpose. But virtually every computer manual from the late '70s to early '90s stressed the importance of not mixing up these characters, because when the computer is...