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M7602/VCB01/QVSS interface information

jmdhuse

Experienced Member
Joined
Apr 30, 2022
Messages
131
Location
USA - Arizona
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

Experienced Member
Joined
Jan 20, 2014
Messages
136
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!
 
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