IRQ 7, DMA 1, Port 220H ! Now I have a vague idea of what IRQs and DMA are, but ... | Hacker News

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		Beretta_Vexee 6 months ago \| parent \| context \| favorite \| on: Creative Technology: The Sound Blaster IRQ 7, DMA 1, Port 220H ! Now I have a vague idea of what IRQs and DMA are, but I still have no idea what port 220h was. Don't forget that the Sound Blaster card had a MIDI port to which you could connect a controller or joystick. That was also a nightmare to configure, with calibrations on all axes, button remapping, etc. We were really motivated for pre-teens.

pansa2 6 months ago | [–]

> I still have no idea what port 220h was

It’s the address (in I/O space, separate from memory space) which the CPU can read/write to communicate with the sound card.

pezezin 6 months ago | [–]

It was the other way around: that connector started as a game port that was then retrofitted as a MIDI port.

https://en.wikipedia.org/wiki/Game_port

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