Under HP BASIC, PLOTTER IS 3,"INTERNAL" is equivalent to PLOTTER IS 6,"INTERNAL" unless the HP 98546 Display compatibility Interface is installed. Under HTBasic, 3 selects CRTA mode and 6 selects CRTB mode. If this is not your intention, you need to do what HP recommends for users of the 98546: use PLOTTER IS CRT,"INTERNAL" instead of 3 or 6. Note: CTRA mode is not supported under HTBasic.
Both HP BASIC and HTBasic do an implicit PLOTTER IS assignment for you if you attempt to use graphic statements before an explicit PLOTTER IS. The difference is that HTBasic does the implicit PLOTTER IS as soon as HTBasic is started, and HP BASIC waits until the first graphic statement is executed. The only known effect of the different approaches is that under HP BASIC, a SYSTEM$("PLOTTER IS") returns "0" until the first graphic statement is executed and HTBasic returns the correct value anytime.
HP BASIC supports only "INTERNAL" and "HPGL" graphic languages. HTBasic supports loadable graphic device drivers so it is not limited to these two choices. HTBasic also allows clip-limits to be specified when output is directed to a device, allowing use of plotters or printers that are incapable of returning p-points.
|