User`s guide
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The remaining bits of the HI-Y character are paired with the remaining
bits of the LO-Y character as follows:
0100101100 = 300 (decimal) = Y coordinate
The resulting X,Y pair (400,300) is expressed in Tekpoints, converted
to pixels by the printer, and plotted on the Tekpage.
In Enhanced Graphics Mode (EGM), the Extra Byte further divides
the (LO-X,LO-Y) unit into a 4 X 4 unit grid. Processing of the five char-
acters is similar to 10-bit addressing. However, the order of charac-
ters received must be: HI-Y, EB (Extra Byte), LO-Y, HI-X, LO-X. Bit 5
of the EB is discarded. Bits 4 and 3 of the EB are added to the 10-bit
Y address. Bits 2 and 1 are added to the 10-bit X address. If the EB is
01100000, then (using the previous examples) the resulting 12-bit
addresses would be:
011001000000 = 1600 (decimal) = X coordinate
010010110000 = 1200 (decimal) = Y coordinate
The resulting X,Y pair (1600,1200) is expressed in Tekpoints, con-
verted to pixels by the printer, and plotted on the Tekpage.
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If only a portion of an address changes, only certain bytes must be
sent, as shown in the following table.
SHORTENED ADDRESS TRANSMISSION RULES
If these change: These bytes must be sent:
Hi-Y Lo-Y Hi-X Lo-X EB
Hi-Y Yes Yes
Lo-Y Yes Yes
Hi-X Yes Yes Yes
Lo-X Yes
Extra Byte Yes