Mark Szeliga Szolkowski's Blog

Online ramblings, usually about athletics or the Sinclair C5 or Spectrum!

Tuesday, December 23, 2008

RST 16 modifies the accumulator...

Aargh - it's taken me a depressing amount of time to realise that the RST16 call to print the contents of the accumulator on the ZX Spectrum has the side effect of modifying the contents of the accumulator. That'll explain why I was getting an "INVALID INK COLOUR" error message in BASIC...

Click on the images for larger versions - they're very exciting...

Labels: assembly language, RST 10, RST 16, Sinclair ZX Spectrum, Z80

# posted by Mark @ 12/23/2008 10:28:00 pm

Comments:

Hi
Very great job ! I used RST16 in a smooth scrolling routing and the same issue.
Very interresting.. I love it
Pat

# posted by  Unknown : Tuesday, November 24, 2009 3:31:00 pm

 

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I am a Defender-ship. I am fiercely protective of my friends and loved ones, and unforgiving of any who would hurt them. Speed and foresight are my strengths, at the cost of a little clumsiness. I'm most comfortable with a few friends, but sometimes particularly enjoy spending time in larger groups. What Video Game Character Are You?