Plugging this adapter in the Video Expansion Connector of an Apple IIc, it generates video signal whose horizontal synchronization frequency is 31.5 KHz and vertical synchronization frequency is 60 Hz. Only NTSC (60Hz) version Apple IIc is supported.
| 1 | ON: make text characters thicker for 80 column text mode. |
| 2 | OFF: color mode, ON: mono color mode |
| 3-6 | specify a color for text and mono color from low resolution 16 colors. Switch 3 is LSB, and switch 6 is MSB. |
Adjust R, G and B level with the RVR, GVR and BVR volume.
With the limitation of pixel clock, 80 column text is not beautiful when using an LCD VGA monitor. So I added a function to make text characters thicker.
Apple IIc ROM255, Apple IIc Plus, DELL E178FPc and MITSUBISHI RDT1713S.
This adapter doesn't support a euro (50Hz) Apple IIc.