OSWORD &2A

&2A 42  Read PRISMA logical screen size				Prisma
	On exit:
		XY?0..1 = maximum X coordinate (width-1)
		XY?2..3 = maximum Y corrdinate (height-1)
	The size of the logical screen will vary with the parameter set
	by the *WIDTH command.

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) 19:52, 25 October 2015 (UTC)