OSWORD &2C

&2C 44  Send VDU code direct to PRISMA				Prisma
	On entry:
		XY?0   = VDU code
		XY?1.. = VDU sequence parameters

	This call provides a fast means of sending a whole VDU sequence
	directly to the PRISMA-3. It is recommended that, where possible,
	machine code programmers use this entry in preference to using
	OSWRCH.

	OSWORD &2C is always directed at the PRISMA-3 and only the
	PRISMA-3 regardless of the setting of *TEXT or *GRAPHICS.
	OSWORD &2C can be used without upsetting characters currently
	in the VDU queue.

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) 19:53, 25 October 2015 (UTC)