OSWORD &29
&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
- 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
