User`s guide
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The HI-X and HI-Y values are assigned the characters from <SP>
(hex 20) to ? (hex 3F). The LO-X values are assigned the characters
from @ (hex 40) to - (hex 5F). The LO-Y values are assigned the
characters from \ (hex 5C) to <DEL> (hex 7F). By using the charac-
ters in these ranges, the start and end Tekpoints for vectors can be
expressed in 10-bit encoding (normal mode). The following table illus-
trates the format and order of bytes for defining addresses. (The EGM
mode uses the Extra Byte to achieve 12-bit encoding for higher defini-
tion plotting.)
The eighth bit of each character is always discarded. The printer must
receive the characters in this order: HI-Y, LO-Y, HI-X, LO-X.
For example, assume that the following characters were received:
) 00101001
l 01101100
, 00101100
P 01010000
The eighth bit of each character is discarded. Bits 7 and 6 of each
character are interpreted according to table 7.1 and stripped from the
remaining bits. The remaining bits of the HI-X character are paired
with the remaining bits of the LO-X character as follows:
0110010000 = 400 (decimal) = X coordinate
7-BIT ASCII CHARACTER
Tag Bits Address Bits
Byte Name 7654321
Hi-Y 0 1 5 MSBs of Y address
Extra Byte 1 1 * Y2Y1X2X1
Lo-Y 1 1 5 inter. bits of Y address
Hi-X 1 1 5 MSBs of X address
Lo-X 1 1 5 inter. bits of X address