This is also why Apple II text had a rainbow fringe on a color display. When certain mono patterns of dots were displayed very close together, it affected the chroma component of the composite signal and showed as a different color. The various adapters differ ONLY in the ID bits on pins 4, 7, and 10, not in the basic connection of the Video signals. Apple IIs could only display color through composite color artifacts. Mac adapters also provide a code on pins 4, 7, and 10 that tells the older Mac what class of displays is attached, If you plan on using this with a Mac later, you will need the right adapter, or one with tiny switches. There are two main types, one intended to adapt Mac displays to VGA computers, and the other intended to adapt older Mac computers to VGA displays. There is an upside to that madness, and that is the Apple had a 6 color high res graphics screen, and when only one pixel is used. You must be careful to get an adapter that has the right male and female connectors. heres explained how TTL monitors can display more than just 8 colors . When the TMS9918 is connected to an Apple II monitor there is a huge overscan issue, since the monitor is tuned for the narrower Apple II screen. There is only ONE way to connect the five key signals that will produce a picture, and every adapter (that is not defective) will connect those signals correctly. The praise lavished on this machine by the. He further says it’s an excellent monitor: The real winner seems to the be the great Sony KV-1311-CR monitor receiver. Featuring High resolution 12 analog RGB color, this monitor plugs directly into the monitor port of the IIGS. This turned out relatively easy because it turns out Don Lancaster’s Hardware Hacker has an article on alternative RGB monitors for the Apple IIgs, and he has a diagram. The adapters shuffle the five crucial signals (Red, Green+Intensity, Blue, Horizontal-Sync, and Vertical-Sync) so that they line up on the correct pins for VGA. The AppleColor RGB Monitor, A2M6014, was made for the Apple IIGS. Adapters to VGA (three rows of pins) are readily available from multiple sources that deal in older Mac equipment. Many Apple displays of about that timeframe used a DB-15 (two rows of pins) connector.
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