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&29 41  Read PRISMA pixel value					Prisma
	On entry:
		XY?0..1 = X coordinate
		XY?2..3 = Y corrdinate
	On exit:
		XY?4    = logical colour of pixel at X,Y
		XY?5..7 = reserved
		XY?8    = &FF=pixel outside graphics windows
	If the *POINT command has been used, then OSWORD 9 (POINT) passes
	and returns the same information in XY+0 to XY+4.

PRISMA calls

See Also

Jgharston (talk) 19:51, 25 October 2015 (UTC)