How to connect a commodore 1084-S video monitor to the Sony Playstation
Finally I've made it... here's my last hack-trick about the PSX: This circuit I'm going to explain works with ANY PSX and ANY 1084-S monitor (if you own a 1085-S monitor you *shouldn't* build the Sync adapter... just wire-up some cables and you've made it!)
The basic connections are:
* PSX II 1084-S *
=================================
* R \ => R \ *
* G I out => G I in *
* B / => B / *
* *
* video =>adapter=> sync *
* *
* audio out => audio in *
* *
* +5 Volts \___ adapter pow. *
* GND / supply *
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The schematics of the adapter and its power supply are the following:
You need to build this adapter in order to invert the video signal because PSX generates a POSITIVE active video signal that works good with the TV set but the 1084-S works only with NEGATIVE active video signal (or vertical sync)
The 1085, instead,works with both positive and negative sync, so You don't need to convert it !
NOTE: the Adapter doesn't need any battery to work ! it is supplied by the PSX multi-AV out (via the * RGB SCART CABLE * )
Here are 1085-S wirings...
(See below for 1084-S wiring notes)
FEMALE SCART 1084-S VIDEO CONNECTOR (DB 9)
I\ Soldering side Soldering side
I \___________ __21
I --20 __19 I I Description:
I --18 __17 I I 5 4 3 2 1 1= ground
I --16 __15 I< -I ------------- 2= ground
I --14 __13 I \ . . . . . / 3= red
I --12 __11 I \ . . . . / 4= green
I --10 __ 9 I ------- 5= blue
I -- 8 __ 7 I 9 8 7 6 7= composite sync.
I -- 6 __ 5 I
I -- 4 __ 3 I
I -- 2 __ 1 I
I-------------I CONNECTIONS:
Scart description: SCART ---> DB 9
======================
8= +VCC 15 ---> 3
15= red 11 ---> 4
11= green 7 ---> 5
7= blue 17 ---> 1,2
20= comp. video 20 ---> 7 * ONLY FOR 1085-S !!! *
17= video ground SCART AUDIO RCA
2= audio r ======================
2 ---> audio right
4= audio ground 6 ---> audio left
6= audio l 4 ---> audio ground
I recommend the solderings made by an expert technician and the use of good quality shielded cable (specially for the RGB lines)
NOTES 1084-S NOTES
You need the adapter to convert the video signal from PSX to TV: SCART pin 20 => adapter => Composite Sync (pin 7 of DB9 connector) It's all based on a little "NOT" logic (74LS04) with a trimmer in order to stabilize the sync.
MAKE SURE TO USE A "LS" I.C. !!!
TROUBLE-SHOOTING
If you can't get a bright and stable image please DOUBLE check :) these points:
- The adapter's circuit and its power supply (if it doesn't seem to work at all, try to remove the voltage regulator LM7405 or LM74L05 and use the PSX supply directly)
- The wirings on the SCART ,DB9 connector & on the board you built
- The trimmer adjust (move it slowly and wait for the picture to get more stable)
