Description - IBM RT Series Hardware Reference Manual

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The Advanced Monochrome Graphics Display Adapter attaches to the

channel and drives a

12-inch monochrome display at a 46 Hz (frame rate) or 92 Hz (field rate) interlace refresh rate.

The adapter provides a 64K-byte bit map that is translated to the screen as 720 pels horizontally by

512 pels vertically, one bit per pel.

The adapter includes a number of hardware performance assists, including a write mask to protect

bit fields within a byte, a barrel shifter to rotate bits within a byte, and a logic unit to combine

source bytes before they are written into the bit map.

Figure 1 on page 2 is a block diagram of the Advanced Monochrome Graphics Display Adapter.

Advanced Monochrome Graphics Display Adapter

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