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Internet Message Format  |  1999-02-11  |  3KB
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  8. From: Rune Zedeler <rune@zedeler.dk>
  9. To: Sasu Lintula <amos-list@onelist.com>
  10. Date: Thu, 11 Feb 1999 01:50:00 +0100
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  22. Subject: [amos-list] Re: [Off Topic] Blitter speed
  23. Status: O
  24. X-Status: 
  25.  
  26. From: Rune Zedeler <rune@zedeler.dk>
  27.  
  28. On 31-Jan-99, Sasu Lintula wrote:
  29.  
  30. >Have any of you heard what kind of speed differences there are between 
  31. >OCS-, ECS- and AGA-blitters? I know that in theory ECS-blitter can draw 
  32.  
  33. The OCS, ECS and AGA blitters are equally fast.
  34. Well... In a given resolution AGA is using a smaller amount of the
  35. bitplane-DMA bandwidth than ECS/OCS - and hence the blitting operations will
  36. be faster.
  37. But the blitter itself has the same speed.
  38.  
  39. If you don't use more than half of the bandwidth then the blitter will not be
  40. slowed down at all.
  41. Half bandwidth is:
  42. AGA: SHires,4planes  or  Hires,8Planes
  43. ECS/OCS: Shires,1plane  or  Hires,2planes  or  Lores,4planes
  44.  
  45.  
  46. -- 
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