VCB01 Video Controller

The VCB01 is a quad-height, 22 bit QBUS bit-mapped video option module (DEC part number M7602), providing workstation capability for Q22-bus systems.

The bitmap memory (also called video memory), is 256 kB of MOS RAM, residing in the Q22-bus address space.

In the VAXstation I and VAXstation II, a subset (sometimes called the screen memory) of the bit-mapped video memory is displayed on a 48 cm (19 in) monochrome monitor (the VR100 Monochrome Monitor).

The VCB01 relies on the CPU to generate all images stored in video memory.

The VCB01 also provides several basic I/0 functions, including:

• Cursor controls
• Mouse interface
• Keyboard interface
• Primitives for VT100-style split-screen scrolling