xjas wrote:You didn't "hot plug" the MIDI connector did you? (Plug or unplug it while the system is on.) That thing carries a nontrivial voltage - it's vaguely possible that a power spike could have done some damage, but 99.9% of the time this would be to some component on the sound card or keyboard. Actually I'm hard-pressed to imagine that could take out a Vram chip, but you never know.
Don't MIDI cables contain opto insolators ? Besides, MIDI is using a serial connection. Serial transmitters often contain diodes as reverse current protection (to prevent ESD, Electrostatic Discharge).
h-a-l-9000 wrote:In DOS the VGA card doesn't use interrupts - except for one or two demoscene products. The corruption on the screen is not IRQ related.
True, I'm aware of that (EGA was hardwired to IRQ2 or used INT 0AH, though). I just mentioned it because this was the only logical reason I could think of.
I never thought the sheer presence of a mpu401 could cause a vram defect on a graphics card..
On the other side, I mean, this PC is so wicked, anything could be the cause.. 😀
@Elia1995 May I ask you again wheter this PC is located near a window ? If so, try movin' it to another place. 😁
Just kidding! Does the problem persists if you remove the entire soundcard ?
Edit: Some corrections, sorry.
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