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I am having trouble locating the special write mode where $00 is not written [solved] — Parallax Forums

I am having trouble locating the special write mode where $00 is not written [solved]

potatoheadpotatohead Posts: 10,261
edited 2020-01-05 08:26 in Propeller 2
Working on a simple blitter this evening, and I can't seem to remember how we set the mode where $00 is basically not written, but all other byte values are.

I will be looking and will update this post when I find it, but just in case any of you are up, and it comes to mind, I would appreciate a quick pointer.

Comments

  • potatoheadpotatohead Posts: 10,261
    The reason I had difficulty, is I was thinking mode, when it's an instruction!

    EEEE 1010011 11I DDDDDDDDD SSSSSSSSS WMLONG D,S/#/PTRx

    Writes a long to the HUB, but will not write any byte field containing $00, leaving whatever contents were in the HUB at that byte field address unchanged.

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