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Algo3

hardware

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#1 sage OFFLINE  

sage

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Posted Sun Sep 9, 2018 12:45 AM

Anyone played  bit with algo3? Even so the EPXY doc says  "algo 3 is broken"?

 

It seems that some circuits are left which work, but mainly for Y.



#2 karri OFFLINE  

karri

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Posted Sun Sep 9, 2018 12:47 PM

I remember seeing this note at some point in time. What was algo3 supposed to do?



#3 sage OFFLINE  

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Posted Sun Sep 9, 2018 2:28 PM

as far as I can tell, it should use a 16 bit mask to select the pixels from the sprite.

 

in Y it somehow seem to do something (but somehow only every second line), but it wont work for X, will stop after few columns.



#4 enthusi ONLINE  

enthusi

    Moonsweeper

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Posted Sun Sep 9, 2018 2:31 PM

You probably saw it here:
FC81 = SPRCTL1 Sprite Control Bits 1 (W)(U)
reset x,x,x,x,x,x,x,x

B7 = literal attribute, 0=normal, 1=totally literal
B6 = Sizing algorithm choice, 0=adder (algo 4), 1=shifter (algo 3)
SET IT T0 ZERO!!!!, algo 3 is broke

Not too helpful, though.

#5 sage OFFLINE  

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Posted Mon Sep 10, 2018 1:34 AM

I found a better description somewhere



#6 karri OFFLINE  

karri

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Posted Mon Sep 10, 2018 4:20 AM

Thanks. Actually I don't really need masked stuff anymore. The "shaped" version combined with a programmable start quadrant takes care of my needs. The only slight problem I have is that tilt/stretch tears the sprite from the anchor point. So in order to tilt my car I need to keep the sprite in one segment.

Screenshot from 2018-09-10 13-20-32.png







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