[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Apple IIGS Monitor Hookup to Jamma

On 4/29/2013 11:34 PM, marko555.os2@gmail.com wrote:
SainSmart card I got came with a Pig-Tail Harness for P11 ( R, G, B, S, HS, VS, GND ) and P9 ( +5-12VDC, GND ). The Pig-Tail Harness for P11 has no Horizontal Sync ( HS ) wire, just the Vertical Sync ( VS ) and a wire for the Shield ( S )... 

Now, about your ][gs and the JAMMA...

Marco Orlandi, <http://www.apple-iigs.info/doc/fichiers/Using%20Apple%20II%20AppleColor%20RGB%20Card%20with%20an%20Apple%20Analog%20Monitor.pdf>, has Pin-Outs for the AppleColor RGB Card and the ][gs RGB Port.  His ][gs RGB Port Pin-Outs match yours..

I "believe" that ALL the Outputs are 0-5 VDC ( TTL ), so if you get the Wrong Video Sync, try the other one..  If Tying ALL the Grounds together seems to cause Interference, you might try using only One, possibly the Red or the Green..

I wouldn't connect the JAMMA Ground to the NTSC/Composite Output... I would think that Shorting the Output would not be a Wise Thing to Do..  Possibly the ][gs Uses that to tell it to provide NO Composite and Only Output RGB....  I guess I will find out shortly....

MarkO
As far as I know, The IIgs always outputs RGB and composite video, there are no select or sense pins to communicate monitor type so no need to ground anything extra. The monitor itself uses the dedicated composite sync pin. The Applecolor RGB only accepts composite sync, not H+V sync, sync-on-green, or composite video.