Jamma Supergun Video Output

[Pempoii]

Is it possible to skip the whole rgb encoder step, which i beleive is the most expensive part, and wire stright to a scart cable?

Im pretty sure ive seen this done, but i can find the link to it, so i may have been hallucinating lol.

any help appretiated

[Taiki]

yup! The hardest part is just wiring it up.

The other part is that some scart sockets dont' support pure RGB either, AFAIK. I'm just some yank with no scart =(

[Pempoii]

thanks for the info.
is there a way to tell if my tv supporst rgb scart? Its an australian tv if hat helps.

also, does anyone hav a schem, or wiring diagram of a scart cable?

thanks again

[M K L]

Scart is found exclusively on European TVs.

[ShinjiGohan]

Scart is found exclusively on European TVs.

not always, I've found some LCD TVs with a scart connection at best buy.

[Pempoii]

2 of my tv's have scart connectins on them.

i also found the page i was talking about,
http://www.chadsarcade.co.uk/oldsite/Supergun/video_connection.htm

has anyone tried this?

also, is it really necessary to use fuses and a board like that? or can i just wire everything straight to the harness?

[M K L]

That's odd... perhaps for newer TVs some manufacturers use the same design/specs across regions. Well good for you, just wire a scart cable like this and find out if it actually works:


Jamma scart
4 (+5v) 16 (through 100ohm resistor)
10 (sp+) 6, 2
12 (R) 15
N (G) 11
13 (B) 7
P (sync) 20
14 (ground) any of 4, 5, 9, 13, 17, 18


Fuses are meant to be used when the load is known and constant which is not the case with superguns where the load, i.e. the jamma board, is variable depending on what you're using: for instance it could be a small PCB that draws less than 1A but then you swap it for a bigger one that draws say 5A. So a fuse rated 10A on the +5v line (as shown in your link) could still be too high for many PCBs. Actually I don't know of any Jamma board that draws anywhere near 10A. Ideally you'd want to measure the current draw of each board you own and the choose the fuse rating accordingly, i.e. just a tad higher than the most power consuming board of the lot. But in the end my advice is not to use fuses at all: modern arcade power supplies are reliable, have built-in overcurrent protections and you never find fuses in cabs, so if it really helps you sleep better put those fuses, otherwise don't bother.

[Pempoii]

thanks alot for that, MKL :)