I'm poking about in the usual places, but not having any luck, does anyone have any good introductory information for HP's AGL, "A Graphics Language"?

  • Do you mean "HP-GL" instead of "AGL"? – dirkt Nov 8 '18 at 16:42
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    No, AGL was an extension to BASIC and FORTRAN. – Maury Markowitz Nov 8 '18 at 17:05

AGL was an extension to BASIC and FORTRAN, which was implemented on several HP systems. It was used to describe what you wanted drawn, and the BASIC/FORTRAN system would generate HP-GL to drive a plotter.

The most accessible manuals seem to be here. The HP-86/87 Plotter ROM Manual, describes the changes to the HP-86 BASIC when using a plotter. These don't seem to be very extensive, suggesting that you also need to look at an HP-86 BASIC manual to learn how the graphics commands worked. However, that manual doesn't seem to be on that site, although the HP-85 manual is.

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  • This is one of the few manuals I've seen that mentions the plotter Digitizing Sight: a precision optical sight that replaces a pen which allows quite accurate (manual) digitization of drawings that fit in the plotter. The reading commands are built in to the Plotter/AGL extension – scruss Nov 9 '18 at 21:53

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