M7602/VCB01/QVSS interface information

[jmdhuse]

Hello All,

I've been starting to mess around with MicroVAX stuff lately, and I got my hands on the monochrome display board used in many of the VAXStation configurations: M7602/VCB01/QVSS. I wasn't able to find any documentation on the 20-pin IDC connector that ideally would go to a patch panel that provides the interface for the monitor, keyboard, and mouse/tablet. So, I spent some time tracing out circuits and believe I have determined all the pin definitions. Here they are, for anyone to use (or to correct!!!):

1 GND
2 +12V
3 RXD_KEYBOARD (4800 baud)
4 TXD_KEYBOARD
5 GND
6 -12V
7 RXD_TABLET (4800 baud)
8 TXD_TABLET
9 HSYNC
10 MOUSE_Y_COUNT
11 MOUSE_X_COUNT
12 VIDEO
13 MOUSE_Y_UP/DOWN
14 MOUSE_X_UP/DOWN
15 MOUSE_BUTTON_1
16 VSYNC
17 +5V
18 MOUSE_BUTTON_2
19 MOUSE_BUTTON_3
20 GND

All the signals are TTL-level, except for the keyboard and tablet, which use RS-232 (+/-12V, inverted logic) signaling. Also, I might have X and Y on the mouse backwards, and I am not sure of the actual mouse button numbering. I don't have a keyboard or mouse in my possession, but I figure this would be useful for anyone (including me) who might try to emulate them with more modern hardware.

Cheers, Jon.

 

[leegleason]

Hello All,

So, I spent some time tracing out circuits and believe I have determined all the pin definitions. Here they are, for anyone to use (or to correct!!!):

I'm just starting to experiment with this board, and this will save me some trouble. Thanks!

 

[jmdhuse]

I'm just starting to experiment with this board, and this will save me some trouble. Thanks!

If you come across anything that seems wrong, please let me know! Thanks, Jon.