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"Super" Uni chassis possibility?


dmworking247

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Hi Joey (& all),

 

I'm currently struggling with a decision on what to do for my upcoming 'hybrid cab' (designed to run Jamma OR MAME with the flick of a switch).

 

It currently has a 26" tube & chassis which I'd rate 7 or 8 out of 10, but I'm going to need to spend A$100+ on an arcadeVGA card to make the PC talk to it. Even after spending that, I gather that PC titles that like a minimum of 800x600 (eg Virtua Cop, Frets On Fire, Ultrastar, Jukeboxes etc) are not going to display or work very well).

 

My other option is to put a 26" (68cm) TV (I just bought one for $2.75 on ebay, :lol ) with an Svideo input. I already have an RGB to Svideo card (bought from in2amusements recently) so there's no further outlay. The downside of this option of course is no fine screen adjustment (height,position, etc) and the dreaded 'lack of authenticity' because of scanlines, refresh, etc etc.

 

Not having personally seen these two options side by side, its very hard to determine how much of this 'purist' stuff would bother me.

 

I was wondering (in my ignorance of technology detail), is there a chance of one of your legendary 'universal chassis' that you recommend for TV tubes, being able to take input from EITHER RGB (arcade/jamma) as WELL as a traditional TV svideo input from a PC? Obviously only one would be used at a time, but I for one would be very interested in such a thing if it were possible.

 

So, a) is this possible and b) to everyone else: Am I the only one who would like such a thing?

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I had the same idea for a vector / raster combo chassis once (ONCE) lol

 

Why do you need a super chassis?

 

You just need a JAMMA 2 in 1 thingy using a normal arcade chassis.

 

IE a Jpac to convert the PC to Jamma, and the other slot for Jamma from the 48 in 1 or arcade PCB or whatever

 

Make sense?

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I had the same idea for a vector / raster combo chassis once (ONCE) lol

 

Why do you need a super chassis?

 

You just need a JAMMA 2 in 1 thingy using a normal arcade chassis.

 

IE a Jpac to convert the PC to Jamma, and the other slot for Jamma from the 48 in 1 or arcade PCB or whatever

 

Make sense?

 

Sorry no, you're going to need to explain that one a little more, JPACs have always confused me.

 

Are you saying I can (easily) interface the PC video output into the arcade monitor without an ArcadeVGA? So VGA goes into the JPAC, and RGB/Sync/Gnd goes out to the arcade monitor? How's that compare with the arcadeVGA option? Any difference regarding res, refresh rate etc?

 

I'm going crosseyed, it must be getting late (oops its 1am)

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Some TVs have the height/width adjustments on the chassis. Have a look.

 

I think use the TV and run the converter for RGB to S/VHS.

There is also a new converter that:

 

- Supports CGA/EGA/YUV signal input.

- Supports VGA output 640*480,800*600,1024*768,1360*768

- CGA/EGA signal auto scan(15K,24K,31K)

- YUV signal auto scan(480i,576i,720i,1080i,480p,576p,720p,1080p)

- Chinese and English OSD.

- Supports position control & zoom control.

- True digital 24-bit A/D converter for true 16.7-million color conversion.

- Supports all VGA monitor (CRT、LCD、PDP、PROJECT.........)

 

I think Joey sells them.

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sounds like dale you need a tri res chassis.

 

what dez was speaking about was one of these

 

one side is mame one side is jamma in your case.

 

for example 6in1

 

http://www.arcademvs.com/accesseriors/A-23-1.jpg

 

also available in a 2in1

 

if not mate just get a astro city VS cab and run 1 setup on either side

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Sorry no, you're going to need to explain that one a little more, JPACs have always confused me.

 

Are you saying I can (easily) interface the PC video output into the arcade monitor without an ArcadeVGA? So VGA goes into the JPAC, and RGB/Sync/Gnd goes out to the arcade monitor? How's that compare with the arcadeVGA option? Any difference regarding res, refresh rate etc?

 

I'm going crosseyed, it must be getting late (oops its 1am)

 

There are 2 things a JPAC does to VGA:

 

1 - Amplifies the RGB signals to a level most arcade chassis expect (a little higher than the standard VGA, but quite a lot of chassis will still work fine with the brightness wound up a little more)

2 - Can do a "bogus" scan conversion (it basically halves the scan signal) to prevent the arcade chassis being stressed by being sent 31khz. This converter is not very good (nor is it meant to be) but bios screens etc are vaguely legible. The idea behind this is if you are using an AVGA or soft15k until their correct drivers kick in the PC will send out 31k video. Most arcade CRTs will try to sync to anything, so if you send 31k to a 15k chassis, it will squeal like a piggie and will die if you do it for very long at all. When the JPAC senses the PC is sending the proper 15k, it will pass it through normally. Note that this behaviour is unlike most modern pc monitors, that if you send them something they can't sync to they will just complain "signal out of range" rather than commit suicide trying to sync :D

 

Does that help a bit?

 

Cheers

Jacob

 

sounds like dale you need a tri res chassis.

 

what dez was speaking about was one of these

 

one side is mame one side is jamma in your case.

 

for example 6in1

 

http://www.arcademvs.com/accesseriors/A-23-1.jpg

 

also available in a 2in1

 

if not mate just get a astro city VS cab and run 1 setup on either side

 

Looks like a great idea narf.

 

Shame the remote just doesn't fit into my mentality of arcade - seems like a joke/toy when that is there... just a button inside the coin door would be better! ( I guess you can double sided tape it in there :D )

 

Cheers

Jacob

Edited by AskJacob
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Even using a JPAC, you still need to slow the VGA scan rate down from 31KHz to 15KHz. The JPAC handles the amplification and wire conversion, but does not process the signal, so a JPAC will not solve your issues on its own. The tri-res idea is a very plausible one! Run PC games in the nice Hi Res they like, JAMMA in standard resolution...only problem you will run into here however is that MAME will run high-res, and 'ruin' the standard games.

 

I would stick with the current plan of AVGA and JAMMA, those PC games will look fine on a decent arcade monitor I think. I always ran a few PC games on mine, and the monitor gives them a nice soft look. The only deal breaker will be if they are text intensive or have small text designed to be read on a PC monitor...as far as games like Frets on Fire go you should be sweeet!

 

EDIT: haha Jacobs came up whilst I wrote this

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  • 2 weeks later...
My other option is to put a 26" (68cm) TV (I just bought one for $2.75 on ebay, ) with an Svideo input. I already have an RGB to Svideo card (bought from in2amusements recently) so there's no further outlay. The downside of this option of course is no fine screen adjustment (height,position, etc) and the dreaded 'lack of authenticity' because of scanlines, refresh, etc etc.

 

Not having personally seen these two options side by side, its very hard to determine how much of this 'purist' stuff would bother me.

 

i can take a pic of 2 cabs side by side different games but you can get the gist of things.

 

im thinking more into this

 

to me mate you need a univeral tri res chassis if joey has something like that to suit your tube (im guessing so he has everything else under the sun for chassis)

 

and somehow have the select or dip switch remote so that you can have the vga plugged in and 15,31k also and then just flick the switch between signals

 

:unsure

 

joey should explain i guess when he reads the thread updates

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Sorry guys I dont have a Tri Res Chassis , TV tubes will not work on 31K without frying the Yoke , TV's are designed to run on CGA 15K but in most cases will do 25K EGA .

The Tri Res Wei-ya chassis is designed to replace High Res 15~31K Arcade Chassis that already have the suitable Tube.

 

I know I have explained this before but Arcade games until the last couple of years dont use VGA 31 or 38K , All the games that mame emulate are 15 or 25K games , almost all apart from a few Atari and Sega Games exclusively use 15K .

VGA is not designed for Arcade it is designed for PC's this is why it is pretty much impossible to buy an arcade monitor that supports 31K.

The few that do support it have proven to be very unreliable and not something I am confident to put my name too.

The other problem being that 31K chassis were designed for Pure Flat CRT's , although there have been some roughly modified variations that work on Curved CRT's ..

 

As I have always said , if you want a machine that is as authentic as possible use an arcade monitor , with the added bonus of being able to use it with authentic arcade games.

Some use RGB to Svhs converters for TV's but side by side with RGB into an arcade monitor there is no comparison.

 

The converter spacies is talking about is awesome for converting all types of signals for use on LCD , plasma's etc , it is not designed to down convert to composite , Svhs or CGA , EGA . , it's really the wrong way around for this application.

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CRT's ..

 

As I have always said , if you want a machine that is as authentic as possible use an arcade monitor......

 

 

.....nuf said :D

 

 

The converter spacies is talking about is awesome for converting all types of signals for use on LCD , plasma's etc , it is not designed to down convert to composite , Svhs or CGA , EGA . , it's really the wrong way around for this application.

 

Yep, no one should consider doing that. I can imagine how ugly it would look!

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