Make your own cable: use your Commodore 1084S-P1 Video Monitor with the Apple IIGS RGB output

The aim of this post is to have a consolidated page to reference when considering monitors other than the Apple RGB with your IIgs that natively support analogue RGB such as the Commodore 1084S.

I personally own the 1084S-P1 (P for Philips, D for Daewoo) variant in great condition that has been beckoning me to use it.  With the sudden opportunity to buy an Apple IIgs ‘Woz Edition’ I set to work in using the RGB video output from it.

Jon Co of Manila Gear demonstrated his 1084S displaying a perfect image driven by an Apple IIe RGB card and custom cable back at WozFest.  I contacted Jon about the cable (among many others things!) and he replied with links to parts to purchase at Jaycar (a local electronics enthusiasts store) and then a pin out guide.

With the parts from Jaycar and the experienced hand of my Uncle to solder each pin we created my new favourite solution.

The 1084S is a workhorse of a monitor for RGB enthusiasts as it supports with the press of a button BOTH Analogue RGB and Digital TTL RGB with intensity!  This monitor can be wired for true CGA colour representation, the Commodore 128 and many more.

I had forgotten how good a CRT can be when LCDs have changed how we perceive a good image.  An example is the “Check startup device” message from the IIgs which has a fast Apple logo scrolling horizontally from left to right on the screen.  The 1084S provided the first time I’d ever seen it move rapidly back in forth smoothly and sharply without any shuddering, ghosting, trails etc.  Seeing is believing.

Gushing aside I have put some time into a new set of tables which I hope clearly and accurately demonstrate the pin outs and where to link them in making your own cable.  Click here for the PDF versionCommodore 1084S Video Monitor DB-9M to Apple IIGS RGB DB-15M pin out verification



You can see in the second pic that I added a home made strip of the Apple 6 colours to customise the montior.

Note: The naming pattern of connections is a grey area that no one can be perfect at.  I have reviwed the excellent Wikipedia article on D-subminiature and can see DB-9 should be DE-9.


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