Jump to content

Performa 6116 - Apple Dos Compatibility Card - Roland MT-32


Recommended Posts

The answer is a big "maybe". Apple's own pinout doesn't show the game port outputting MIDI signals, but that doesn't mean its true. If you have the card, I would do testing with a multimeter and see if +5V is present on pin 15 of the game port. If so, I wouldn't connect any MIDI device to the machine as that is supposed to be the MIDI-IN pin!

 

http://support.apple.com/kb/TA31667?viewlocale=en_US

Link to post
Share on other sites
Interesting... can programs running on the DOS card/s access a Mac serial MIDI converter?

 

Not possible. The defacto standard for external MIDI port communication on a DOS machine is a UART located at 300h or 330h that is register compatible with the Roland MPU-401 MIDI interface. Its silly that the joystick port doesn't support MIDI. The Creative Labs VIBRA chip set used for sound on the DOS card has all the necessary functionality built into it.

Link to post
Share on other sites
  • 5 years later...

Necro Post!

This MIDI to serial converter for DOS looks promising: http://bjt42.github.io/softmpu/

 

And a video of it in action:

https://www.youtube.com/watch?v=p3qCIe0TmtQ&feature=youtu.be

 

I haven't taken much time to look at how it works but the limitation @NJRoadfan talked about back in 2013 seems (no Midi expert here) to be easily bypassable now don't you think?

Edited by BadGoldEagle
Link to post
Share on other sites

Additionally, I just remembered while casually browsing for a MIDI Synth that the SC-55 MkII can be used over serial directly, therefore bypassing the MPU-401 interface altogether. 

The best part is that it uses a Mini DIN 8, so any straight through Apple serial cable can be used with the SoundCanevas without any modification necessary.

As @Bunsen pointed out, it should be possible to redirect that serial interface to the PC part without any visible issue, right?

Link to post
Share on other sites

A few notes. There is no guarantee that the serial port emulation from the DOS card to Mac side will work at all, there may be timing issues with MIDI devices. SoftMPU only works with non-protected mode games since it uses the 486's MMU to port trap writes to an emulated MPU-401 and redirect them. Anything protected mode needs modification directly (very few games can be configured to use a MIDI device on a serial COM port).

Link to post
Share on other sites

Whether this is relevant for the Houdini, I recall for the SoundCanvases and their derivatives, the mini DIN pin outs for the PC and Mac cables were different between each other. As said above, Mac one is indeed a standard beige Mac-compatible serial cable.

 

QuickTime 2(.1?) and OMS do a fantastic job of allowing for re-routing an active MIDI device to anything that talks QuickTime. It's up to the capabilities of the Houdini software if Apple allows for something like that, which might be a stretch.

Link to post
Share on other sites

 

Thanks for your input!

 

29 minutes ago, NJRoadfan said:

very few games can be configured to use a MIDI device on a serial COM port

So using a MkII and serial might not be the best idea after all. So SoftMPU might work better, if it can be used at all on a 66MHz 486...

 

29 minutes ago, NJRoadfan said:

SoftMPU only works with non-protected mode games

Are there a lot of these? I'm new to DOS in general. The first computer I got to use ran Windows 9x and I never played any DOS games out of DOSBox.

Edit: Well, it seems there are quite a few. Welp.

 

19 minutes ago, nglevin said:

the mini DIN pin outs for the PC and Mac cables were different between each other.

I'll have to investigate that!

Edited by BadGoldEagle
Link to post
Share on other sites
  • 1 year later...

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
×
×
  • Create New...