IBMCD(4)

📦 version 11.0, in nixpkgs unstable

💸 ibmcd — the IBM 4810 BSP cash drawer port, bestie edition 💸

okay so you found the IBMCD(4) page in the Kernel Interfaces Manual and you're like "what is this" — don't worry, I got you 🫶. This is the driver that talks to your cash drawer. Yes, like an actual money drawer. At a point of sale. Iconic behaviour honestly 👑

✨ SYNOPSIS ✨

ibmcd* at at pci ? dev ? function ?
gpio* at ibmcd?

(and yes, at at is literally what's written, I am not touching it, it's giving "the manpage said what it said" 💅)

🌸 DESCRIPTION 🌸

The ibmcd driver controls the cash drawer port of the IBM 4810 BSP PCI device — the one you'll find hanging out in IBM point of sale terminals (like, for example, in the SurePOS 300 series), and it does it all through the GPIO subsystem. no cap, that's the whole vibe ✨

So ibmcd gives you a GPIO device with three pins:

  • pin 0 — this is the main character 🎀 it controls the cash drawer
  • pin 1 — this one reads the current state of the sense input pin

and for those readings it's like:

  • a logical 0 means the cash drawer is closed 🔒
  • a logical 1 means the cash drawer is open 🔓

Then there's pin 2, which reports whether a cash drawer is connected at all:

  • a logical 0 means there is no cash drawer connected 😭
  • a logical 1 means the cash drawer is connected 💖

And here's the fun part: to open the cash drawer, you just set pin 0 to logical 1. That's it. You do not need to reset pin 0 back to logical 0 afterwards, because the device generates a oneshot impulse on its own. it handles the cleanup, it's very self-sufficient like that 🧚

lowkey the best part — one 1 and you're done, no take-backs required 🌈

🦋 SEE ALSO 🦋

⭐ HISTORY ⭐

The ibmcd driver first appeared in NetBSD 6.1. a whole era honestly 💜

👑 AUTHORS 👑

The ibmcd driver was written by Marc Balmer <marc@msys.ch> — thank you king, the drawers open because of you 🙏

and that's the page!! 🌸 this one shipped with Debian, dated December 17, 2012 — go forth and open your cash drawer, bestie, you've got this 💅✨🎀

📦 where this page comes from