Jamma test rig with Commodore monitor

[petercasino]

I'm building a Jamma test rig and I'm trying to use an old Commodore monitor as the display. It's a Novex NC-1414 monitor. Unfortunately I can't find a manual online for it but it has one RGB input via an 8 pin din plug. I've found the following din pinouts for a Commodore 1084 and the connector looks like the digital RGBI input below:

I've built a connector and connected the Jamma composite sync to the Horiz+Vert sync. I've not connected anything to the Intensity pin (not sure what it is).

I've tested with a working Jamma board and I'm getting a picture and it's in sync but the colours are all over the place with certain graphics completely missing , it almost looks like the picture is a negative.

Have I wired the connector correctly? Should the digital RGBI input work at all, or would I need an analog RGB input (which unfortunately this monitor doesn't have)?

Cheers,

Mike

 

[minwah]

I am not familiar with the digital RGBI connection but I would have thought you'd need an analog RGB input.

 

[obcd]

Digital inputs simply turn the color on or off. This gives a total of 8 different colors. The intensity bit doubles that number to 16. Older pc 16 color schemes also follow that idea. For instance, color 7 was white. (All 3 colors on) and color 15 was bright white (All 3 colors on and intensity on)

 

[petercasino]

Does that mean I can't use this monitor for Jamma RGB inputs?

 

[silverfox0786]

Does that mean I can't use this monitor for Jamma RGB inputs?

have you go a 9 pin d sub on your which has a switch next to it allowing to swap from digital to analogue RGB

if so then you can use for jamma

normally the 1084S monitors have this option

 

[petercasino]

It's got one 8 pin din with a switch next to it for Horizontal/Vertical sync. Then another push button that switches between RGB and the standard Commodore input connector (not sure what that's called).

 

[silverfox0786]

It's got one 8 pin din with a switch next to it for Horizontal/Vertical sync. Then another push button that switches between RGB and the standard Commodore input connector (not sure what that's called).

if its the same as the picture pinouts in your first post then you can use it

you need analogue pinouts (6 pin)

not the Digital 8 pin port which is RGBi

silverfox07862016-01-26 16:26:56

 

[petercasino]

It only has one connector (the digital 8 pin port) unfortunately.

 

[silverfox0786]

It only has one connector (the digital 8 pin port) unfortunately.

then you cant

but let me check the manual of your

can you give me the exact monitor model number as on teh back of the TV on the silder sticker

 

[petercasino]

It's a Novex NC-1414-CL

 

[silverfox0786]

That monitor is around 1983 so it was before the Commodore 128 RGBi and more around the time of the C64 and predates the Amiga

with that in mind it seems to me that this monitor is capable of addressing Component for C64 and Analogue RGB needed for a Jamma rig, if you can find what the pin-outs are

a little research has told me that these where used in BBC and Acorn Computers and those machines are Analogue RGB so its promising

not much info on the net about this monitor but you never know you may be in luck

the other option is to find a Commodore 1084S-D1

silverfox07862016-01-26 19:00:41

 

[silverfox0786]

	Product: Novex 14in colour monitor
	
	(NC-1414-CL-UK)
	
	Manufacturer: Novex Electronics,
	
	Hong Kong
	
	Purpose: Standard RGB/PAL video
	
	monitor
	
	Dimensions: 385 x 370 x 355mm
	
	(WxDxH)
	
	Weight: 147kg  <<  (HAHA [IMG]https://www.ukvac.com/forum/data/smileys/smiley36.gif[/IMG])
	
	Resolution: 452 x 585 lines
	
	Band width: 7MHz
	
	User Controls: PAL: colour, contrast
	
	and brightness. RGB: V-hold.
	
	brightness. Picture selection switch.
	
	power on/off
	
	Price: El 99,95 -I- VAT + carriage
	
	Review copy from: Retail Control
	
	Systems, Enterprise House. Central
	
	Way, North Feltham Trading Estate,
	
	Feltham, Middlesex.

 

[petercasino]

I've just moved the red,green and blue wires to pins: 3, 4 and 5 (random I know!) and now the picture seems better. Here's a photo of the screen:

It's missing the grey Taito text. I'm not sure what would cause that. Is Red/Green/Blue the wrong way around?

This is what it's supposed to look like:

 

[smarty]

You are missing Green from your image.smarty2016-01-26 20:14:00

 

[Hurray Banana]

You are missing Green from your image.

That is definitely what's wrong with that image, well spotted

 

[petercasino]

Ok thanks, green is definitely connected and the picture changes if I disconnect it, do I need to adjust the colour on the neck board?