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puting time as double density, it prints at the same speed as nor-
mal density graphics. Amazing, you say? Well, it is - until you
know the secret. Every other column of dots is ignored, so the
output is actually the same as normal density graphics. The ad-
vantage is that you can write and debug your programs at dou-
ble speed, then change to double density graphics for terrific out-
put.
This printer has three other densities (CRT, plotter, and CRT
type II ) which can be used to achieve greater compatibility with
various hardware and software configurations. Plotter density
can be especially for simplifying programming, since it has
equal densities both the horizontal and vertical directions (72
dots per inch each way). With this feature you can plot truely
round circles without any type of scaling factors.
COMPATIBJLITY WITH EXISTING SOFTWARE
With its ability to print seven different graphics densities, this
printer’s graphics abilities are advanced indeed. There are
many programs, in fact, that are unable to use this printer’s
single graphics command (ESC)“*” for selecting the proper
density. To maintain compatibility with this software, there are
individual commands to select each of this printer’s common
Table 7-3
Alternative graphics commands
Density Single command
Individual command
Normal
(ESC)“*” CHWW) ~1 n2 (ESC)<<K,, lzl n2ml m2 ...
ml m2 . . .
Double
(ES(I)“*”
CHR$(l) ” x2?
ml m.2 . . .
(ESC)“L” nl nZ ml m2 . . .
Double with (ESC)“*” CHR$(2) nl n2 xESC)“Y,, nl n2 ml m2
double-speed ml m2 . . .
. . .
Quadruple
(ES(Z)“*” CHR$(3) nl n2
ml m2 . . .
(ESC)“Z” nl 722 ml m2 . . .
CRT
(ES(Z)“*” CHR$(4) nl n2 none
ml m2 . . .
Plotter
(ES(I)“*” CHR$(5) nl 722 nOne
ml m2 . . .
(ES(X)“*”
CRT type II ml m2
CHRW) ~1 ~2 nOne
. . .