OSWORD &30

&30 48  Read PRISMA interrupt status				Prisma
	On exit:
		XY?0 = Event 32 enable status
		XY?1 = Upper screen status
		XY?2 = Base screen status
		XY?3 = Lower screen status
		XY?4 = Window overlay status
		XY?5 = Roller screen enable status

	This call returns the current booking status of the various
	routines executed by the PRISMA-3 on every field sync interrupt.
	Each byte is returned as zero if the associated routine is not
	booked, and returned as non-zero if the routine is booked.

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) 19:55, 25 October 2015 (UTC)