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Re: Does ISA video card need IRQ/DMA/PORT?

Posted on 2018-01-30, 19:54

No offense, but we are not talking about C64, Amiga, and other non-PC systems here. It was just extra information, to put things in perspective. It is VERY common for graphics hardware to have IRQs. It often helps to know more than one side of the story. The question was about ISA cards in a PC, …

Re: Does ISA video card need IRQ/DMA/PORT?

Posted on 2018-01-30, 19:12

There's no need for the graphics card to interrupt the CPU. Actually there is, and most non-PC systems have this functionality. At the very least you want to know when the vertical blank interval occurs. PCjr and EGA/VGA support this (see page 72 here: http://www.minuszerodegrees.net/oa/OA%20-% …

Re: MCA Adlib card -- just need pictures

Posted on 2018-01-29, 15:51

sigtau wrote: It appears to use the chip just for DMA What kind of DMA are you talking about? Since the ISA AdLib has no DAC of any kind, it also does not perform any DMA transfers. So I don't see why the MCA version would need any kind of DMA either (unless it's for some fancy MCA auto-config …

Re: PowerVR Fun Thread

Posted on 2018-01-29, 13:38

That's interesting...a PIII/P4/T-Bird have lot's of horsepower compared to a P133/P166MMX that was the target for the voodoo1 as the competitor. I read that because of the "pci-bus-transfer" the main gpu-should be fast too and the onboard-gpu's cause/have "performance-problems" with the m3d. I …

Re: IBM Music Feature Card/Yamaha FB-01

Posted on 2018-01-25, 19:14

Hum, interesting... I thought I had the voice bank SysEx working, because if I exported voice data from my IMFC and imported it into the FB-01 emulator, all data seemed to arrive correctly, all packets had the correct length and checksum was okay... Then I started up Leisure Suit Larry 3, and it …

Re: IBM Music Feature Card/Yamaha FB-01

Posted on 2018-01-23, 23:33

I've hacked up a quick-and-dirty system to buffer data and send it out to a MIDI in device with timestamps, so I think the plumbing is pretty much done at this point. All that's left is the actual FB-01 emulator... and lots of cleaning up and bugfixing I suppose (the MIDI in-part of the driver isn't …

Re: IBM Music Feature Card/Yamaha FB-01

Posted on 2018-01-23, 14:27

In order to debug the upcoming feast of SysEx data, I figured I would go and look for an FB-01 instrument editor first. I found an Open Source one: https://sourceforge.net/projects/fb01editor/ Sadly, it had a race condition on sending and receiving SysEx data, at least on some MIDI devices ( …

Re: IBM Music Feature Card/Yamaha FB-01

Posted on 2018-01-22, 16:17

Some more progress on the driver front: it was indeed quite easy to make a single MIDI driver act as both a MIDI in and MIDI out driver. I've added the necessary export function (midMessage()), and it now shows up as a MIDI in device as well. Now I need to find out how to actually send data to the …

Re: IBM Music Feature Card/Yamaha FB-01

Posted on 2018-01-22, 08:56

Another update for SoftIMFC: https://www.dropbox.com/s/1qorqr9ppyorod6/SoftIMFC.zip?dl=0 This time it should really work on MPU-401. In the earlier version the init code was never called, so it never switched the MPU-401 into UART mode. Which meant it only worked if the MPU-401 was already in UART- …

Re: IBM Music Feature Card/Yamaha FB-01

Posted on 2018-01-21, 22:24

Here is the latest build of my custom DOSBox with IMFC support: https://www.dropbox.com/s/dlk84chf35jzr2m/DOSBoxIMFC.zip?dl=0 A first quick-and-dirty version of MIDI In has been added, and I can get data from a real IMFC connected to a USB MIDI device into DOSBox. If you were to use a Yamaha FB-01, …

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