Introduction
I bought a refurbished 20 inches monitor. It is a RasterOps, but I don’t know the model. Inside, it uses a Hitachi CM2085.
The problem is the connectors are BNC types. The solution is to make a new cable, with sense connected in the right way. I find that the Hitachi CM2085 can do up to 1024×768 at 75 Hz, and it is multiscan. In the Apple video mode, it’s a 16 inches multiscan.
Description
Connection
The sense on the Mac video plug should be connected like this:Sense 0 (pin 10) connected to ground.Sense 1 (pin 7) connected to sense 2 (pin 4) with the diode (the mark next to sense 2).Look at Apple for technote HW30 for more info on sense modes. You’ll need 5 BNC, and a DB-15 male connector (not a high density one), an a diode for example an 1N4148. Here is the connections:
DB-15 Mac | Name | Output | |
1 | Red Gnd | —— | BNC Red Gnd |
2 | Red | —— | BNC Red |
3 | /CSYNC | ||
4 | sense 2 | —— | sense 1 (DB-15) |
5 | Green | —— | BNC Green |
6 | Green Gnd | —— | BNC Green Gnd |
7 | sense 1 | —— | sense 2 (DB-15) |
8 | |||
9 | Blue | —— | BNC Blue |
10 | sense 0 | ||
11 | C&VSYNC Gnd | —— | BNC VSYNC Gnd |
12 | /VSYNC | —— | BNC VSYNC |
13 | Blue Gnd | —— | BNC Blue Gnd |
14 | HSYNC Gnd | —— | BNC HSYNC Gnd |
15 | /HSYNC | —— | BNC HSYNC |
Use under differents OS
The Hitachi CM2085 works perfectly with many OS because it is multiscan. It can support resolution from 640×480 to 1024×768.