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NAOMI/MAME Switching Cabinet (with pictures!!!)
JoeB:
--- Quote from: bimm25e on December 05, 2013, 03:22:50 pm ----I DO have the slightest amount of "noise" using the PC with Soft 15KHz, its totally negligible and only a real ---uvula--- would be looking hard enough to notice it.
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So when you plug the monitor directly to the VGA card all the noise goes away? That's the problem I had .. and with 29" CRT it's even MORE noticeable.
If you want to save/protect your PC, consider getting an ArcadeVGA or JPAC. Both will prevent 31k from feeding into monitor from PC.
--- Quote from: bimm25e on December 05, 2013, 03:22:50 pm --- But the NAOMI input still looks perfect - no noise or artifacts like you mention. I am using a Capcom I/O to interface to the cabinet - the KVM plugs directly into the Capcom I/O and I haven't noticed any video loss at all with this configuration.
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Naomi native resolution is 31k. You probably have it set to 15k output. The way Naomi does it is by cutting the number of lines by half and interlacing the picture. i.e. you have that horrible flicker! Try to get a solution that will actually scale the image from 31k down to 15k (e.g. UVC) You will get 15k non-interlaced video signal (i.e. 240p video rather than 480i) much cleaner and no flicker.
--- Quote ---so all-in-all its like a 12' VGA cable connecting the active device to the Capcom I/O. I bought a secondhand KVM but it looks like it wasn't cheap when it was initially bought, it switches the audio signal as well and I can say that I am an audiophile and I haven't noticed any audio degradation with my setup.
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Your ears are much more forgiving than your eyes. I'm confused about your hookup. your naomi/pc video is hooked up to KVM, and KVM to arcade monitor, right? What about the buttons? Naomi/pc to KVM, KVM to Sega I/O, Sega I/O to buttons? This sounds strange because PC shouldn't be able to understand input from Capcom I/O. Even though it's a "usb" cable between capcom I/O and naomi, it's not real USB.
Also, is this an active KVM? does it add any lag or amplification? How does handle the many different resolutions that MAME can put out?
bimm25e:
So when you plug the monitor directly to the VGA card all the noise goes away? That's the problem I had .. and with 29" CRT it's even MORE noticeable.
If you want to save/protect your PC, consider getting an ArcadeVGA or JPAC. Both will prevent 31k from feeding into monitor from PC.
- No I can't tell a difference with the KVM in line vs. a direct connection
Naomi native resolution is 31k. You probably have it set to 15k output. The way Naomi does it is by cutting the number of lines by half and interlacing the picture. i.e. you have that horrible flicker! Try to get a solution that will actually scale the image from 31k down to 15k (e.g. UVC) You will get 15k non-interlaced video signal (i.e. 240p video rather than 480i) much cleaner and no flicker.
- I know that NAOMI (1) supports CGA and VGA - I only have a CGA monitor so it is what it is for me, 15KHz. There are NO video errors at all when the NAOMI is the active source, there is an extremely negligible issue on the PC source's video where scanlines race across the monitor for about a second every 20 seconds or so (I think it would be fixable with a little more v-hold/h-hold tweaking but its so negligible I don't care right now). The error exists whether the PC is connected directly to the CAPCOM I/O or if its routed through the KVM
Your ears are much more forgiving than your eyes. I'm confused about your hookup. your naomi/pc video is hooked up to KVM, and KVM to arcade monitor, right? What about the buttons? Naomi/pc to KVM, KVM to Sega I/O, Sega I/O to buttons? This sounds strange because PC shouldn't be able to understand input from Capcom I/O. Even though it's a "usb" cable between capcom I/O and naomi, it's not real USB.
Also, is this an active KVM? does it add any lag or amplification? How does handle the many different resolutions that MAME can put out?
- It is a passthrough KVM, the video AND audio are switched through it. You have skipped some of my posts or you would have noticed where I use a rotary switch to change the buttons from the NAOMI to the PC - each button is ran through the rotary switch individually, the "usb" port on the NAOMI goes right to the Capcom I/O
to switch I press the button on the KVM and then turn the rotary switch that switches the buttons from the NAOMI to a couple USB encoders I have routed to the PC.