OSWORD &32

&32 50  Read position of PRISMA-3 roller screen			Prisma
	On entry:
		XY?0 = screen number
			0: Upper screen
			1: Base screen
			2: Lower screen
			3: Window overlay (source area)
	On exit:
		XY?0    = screen number
		XY?1..2 = X coordinate
		XY?3..4 = Y coordinate

	This call returns the top left hand coordinate visible on each
	of the four screen areas. This call will only return correct
	results when programmed with widths of 2048 or 4096.

PRISMA calls

• OSWORD &28 Read PRISMA information table
• OSWORD &29 Read PRISMA pixel value
• OSWORD &2A Read PRISMA logical screen size
• OSWORD &2B Read PRISMA colour palette
• OSWORD &2C Send VDU sequence direct to PRISMA
• OSWORD &2D Read last two PRISMA graphics cursors
• OSWORD &2E Read PRISMA base screen visible origin
• OSWORD &2F Read PRISMA graphics origin
• OSWORD &30 Read PRISMA interrupt status
• OSWORD &31 Direct call to PRISMA command
• OSWORD &32 Read position of PRISMA-3 roller screen
• OSWORD &33 Read/Write PRISMA overlay or nonvolatile memory

See Also

• http://mdfs.net/Docs/Comp/BBC/Oswords

Jgharston (talk) 19:57, 25 October 2015 (UTC)