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I came across an early IBM PC ISA realtime clock/calendar card made by Quadram called the "Chronograph" (picture). It's basically the same clock feature they incorporated into their QuadBoard lines, but in a standalone form. What's odd is the metal card bracket is unusual and doesn't even fit into any PC case (no, not even a 5150).

enter image description here

MinusZeroDegrees has a photo of a RAM board also made by Quadram with the same bracket, and both are featured in other promotional literature.

I've never come across any other cards like this and haven't been able to find any other examples online. There are no enlightening special instructions for installation in the manual - it simply says "The Clock/Calendar may be plugged into any available slot in the Personal Computer." The only way apparently to use this card in a PC is to remove the bracket and put it in a slot just flopping around, maybe with a blank filler plate behind it. I can't imagine that was the way it was intended to be used though.

Any ideas about this?

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    I've never seen any of those, but they look as if you could just screw them on top of an existing bracket, either the "blind" ones, or the secondary ones you had e.g. for the multi-port cards. There's even enough space for the connectors of those secondary brackets, so it'd be a clever way to use a slot behind a secondary bracket (which otherwise would be wasted).
    – dirkt
    Jun 18, 2021 at 19:13
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    Do you have a photo of it not fitting in the 5150 case?
    – snips-n-snails
    Jun 18, 2021 at 19:18
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    TBH I haven't seen a bracket like that before, so I learned something new today. Thanks for posting the question!
    – snips-n-snails
    Jun 18, 2021 at 20:05
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    Now try to screw it on top of a "secondary" bracket.
    – dirkt
    Jun 19, 2021 at 7:43

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It fits.

Okay, so I'd swear that I tried this when I got the card and it didn't fit. But it took someone asking for a photo for me to try it again in a 5150 and....

enter image description here

Now it is a little bit awkward in a 5160 because it slightly blocks the adjacent card but it DOES in fact fit.

enter image description here

(facepalm)

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