Questions tagged [ports]

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Were there ever any commercial products produced for the BeBox GeekPort?

I know that the BeBox was a short lived product, but whenever someone mentions it they never fail to also point out the "GeekPort". While the possibilities of the GeekPort were tremendous, I'...
bjb's user avatar
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24 votes
2 answers
4k views

How did Joysticks with more than 4 buttons and all those extra features work on a Game Port?

The question is pretty straight forward. How did they do so much more than the simple, unidirectional 4 axis of analog control, plus 4 on/off buttons? There was surprisingly precise force feedback ...
nabeelr's user avatar
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5 votes
4 answers
676 views

Which home computer first included a printer and modem port as standard?

As home computers rapidly gained in popularity in the early 1980s, third-party peripheral manufacturers also began selling peripherals. For those users wanting to do "serious work", the ...
Brian H's user avatar
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13 votes
2 answers
2k views

If a PS/2 device on a 32-bit x86 sends a byte to the IO port 0x60 and you read it, what happens next?

I'm writing a hobby OS and the first thing I want to do is access PS/2 devices (it's a somewhat legacy, 32 bit OS, so I figured it's relevant to ask here?). I can see my PS/2 devices and I want to ...
Michael Stachowsky's user avatar
12 votes
2 answers
3k views

Why do some Atari ST motherboards include many Inductors?

There are versions of the Atari 520ST, and perhaps the 1040ST, that differ in having many discrete inductors attached at the I/O port lines for serial, parallel and floppy ports. The first image below ...
Brian H's user avatar
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11 votes
5 answers
3k views

Did the PAL version of Super Mario Bros. on the NES really have faster music, and if so, why?

I have a real PAL NES hooked up to a modern TV with an AV-to-HDMI adapter (yeah, I'm working on finding a CRT). I bought an EverDrive cartridge for it because I'm a poor person who cannot afford to ...
Lumen's user avatar
  • 111
3 votes
1 answer
352 views

Did Tomb Raider on Saturn have fewer save crystals than the PlayStation port? [closed]

I've been trying to find this out for ages. Having owned the Saturn version (which was the original release, BTW) when it was new, but also playing the PlayStation version at a cousin's house, I could'...
Britzius's user avatar
10 votes
2 answers
558 views

Could the BBC micro's analogue input be used to sample sound?

Reference: BBC Micro analogue in A custom connector would be required between this D-shape rows of pins port and a standard input socket for phono/rca or 3.5inch or 1/4inch jack. What would be the bit ...
therobyouknow's user avatar
9 votes
2 answers
1k views

What was the 1 MHz bus used for on the BBC micro series?

What was the 1 MHz bus used for on the BBC micro series and how did it compare with the TUBE in terms of speed/bandwidth? I read somewhere that EPROM programmers used the 1 MHz bus, but anything else?
therobyouknow's user avatar
0 votes
1 answer
561 views

How were console games ported to DOS?

Many popular DOS games were ported from video game consoles: Earthworm Jim Mega Man The Lion King The Lost Vikings Turrican 2 Rayman Oscar Zool Video game consoles generally have wildly different ...
Jaap Joris Vens's user avatar
-2 votes
2 answers
360 views

What is this port? [closed]

So, first off, to begin with this isn't "exactly" retrocomputing; the technology in question is about 5-10 years old. That being said, I couldn't find answers anywhere else, so my best bet ...
In Hoc Signo's user avatar
18 votes
8 answers
5k views

Were there any parallel port keyboards?

I was reading this QA ( Why is the clock frequency of the PS/2 keyboard protocol so high? ) and read in the replies that a high frequency was chosen (at least in-part) to reduce the latency between a ...
Dai's user avatar
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25 votes
2 answers
5k views

Why did SCSI require so many pins?

SCSI, I think, is a serial interface. A standard serial port on PCs used a 9-pin DSub connector where a parallel port used a 25-pin connector. Then why did SCSI require so many pins? I vaguely ...
Daniel A. White's user avatar
10 votes
10 answers
502 views

What 8-bit microcomputer systems multiplexed multiple physical ports on a single controller?

The NEC PC-8201 had three serial interface ports on the back, "RS-232," "SIO1" and "SIO2." These were all driven by a single IM6402 USART, switched between each physical port via bits 7 and 6 of IO ...
cjs's user avatar
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6 votes
2 answers
2k views

How did the BBC sideways ROM software for the AMX mouse process the user port input data to determine x and y movement?

This mouse plugged into the user port on the underside of the BBC micro models. The mouse came with software in the form of a sideways ROM which provided APIs, CLI commands for own programs as well as ...
therobyouknow's user avatar
4 votes
1 answer
379 views

Did the IBM Game Control Adapter have I/O port aliases?

I was taking a look at the logic diagram in the manual for the original IBM game port adapter card: In the upper-left corner of the schematic, there is the circuitry responsible for decoding the I/O ...
smitelli's user avatar
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15 votes
3 answers
3k views

What are the electrical characteristics of a PC gameport?

I'm considering building some custom gizmos to connect to the gameport on my retro-hobby PC (SNES controller adapter, macro/turbo box, etc.) but I haven't been able to find much information on details ...
ssokolow's user avatar
  • 6,481
47 votes
5 answers
6k views

Why are C64 games inconsistent with which joystick port they use?

The Commodore 64 has two DE-9 joystick ports. If I'm the only person that ever plays games on it, you would assume that you could just leave a joystick plugged into Port 1 and be done with it. However,...
bjb's user avatar
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8 votes
1 answer
3k views

Is the NES controller port identical to the port on a Wii remote?

I was recently playing on a friend's NES Classic, and noticed that the controller ports look similar to the ones on a Wii remote (where you can plug in the Numchuck or Class Controller). Keep in mind ...
Badasahog's user avatar
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