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OSWORD &29 - Revision history
2024-03-29T00:02:00Z
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Jgharston: Created page with "Category:OSWORD &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..."
2015-10-25T19:51:39Z
<p>Created page with "<a href="/Category:OSWORD" title="Category:OSWORD">Category:OSWORD</a> &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..."</p>
<p><b>New page</b></p><div>[[Category:OSWORD]]<br />
&29 41 Read PRISMA pixel value Prisma<br />
On entry:<br />
XY?0..1 = X coordinate<br />
XY?2..3 = Y corrdinate<br />
On exit:<br />
XY?4 = logical colour of pixel at X,Y<br />
XY?5..7 = reserved<br />
XY?8 = &FF=pixel outside graphics windows<br />
If the *POINT command has been used, then OSWORD 9 (POINT) passes<br />
and returns the same information in XY+0 to XY+4.<br />
<br />
==PRISMA calls==<br />
* [[OSWORD &28]] Read PRISMA information table<br />
* [[OSWORD &29]] Read PRISMA pixel value<br />
* [[OSWORD &2A]] Read PRISMA logical screen size<br />
* [[OSWORD &2B]] Read PRISMA colour palette<br />
* [[OSWORD &2C]] Send VDU sequence direct to PRISMA<br />
* [[OSWORD &2D]] Read last two PRISMA graphics cursors<br />
* [[OSWORD &2E]] Read PRISMA base screen visible origin<br />
* [[OSWORD &2F]] Read PRISMA graphics origin<br />
* [[OSWORD &30]] Read PRISMA interrupt status<br />
* [[OSWORD &31]] Direct call to PRISMA command<br />
* [[OSWORD &32]] Read position of PRISMA-3 roller screen<br />
* [[OSWORD &33]] Read/Write PRISMA overlay or nonvolatile memory<br />
<br />
==See Also==<br />
* http://mdfs.net/Docs/Comp/BBC/Oswords<br />
[[User:Jgharston|Jgharston]] ([[User talk:Jgharston|talk]]) 19:51, 25 October 2015 (UTC)</div>
Jgharston