HGET (sx,sy)-(ex,ey),buffer
Stores a rectangle that is on the high-resolution graphics screen into a buffer previously set up by the HBUFF command for future use by the HPUT command.
sx,sy First corner of rectangle
ex,ey Opposite corner of rectangle
buffer Number of buffer

HGET (21,32)-(28,37),1

Calculate HBUFF automatically from mode and size of rectangle requested.

Merge with GET command to manage buffers on all screen types.

Automatically optimize to amount of bytes needed for faster GET/PUT operations.

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