#: 5476 S15/Hot Topics
    23-Jul-90  04:44:17
Sb: GFX Speed Comparison
Fm: Kevin Darling (UG Pres) 76703,4227
To: all

Just for fun, I've run a speed comparison test... what I did was to GET an
80x40 block of gfx, and then PUT it across the screen in a matrix (the actual
count of PUTs is close to 1400). All programs were in Basic.

The results were:

 15Mhz 68070 (MM/1)  at 640x208x16-color -   6 seconds (prelim ver)
  2Mhz  6809 (Coco3) at 640x192x 4-color - 490 seconds (old grfdrv)
  2Mhz  6809 (Coco3) at 640x192x 4-color -  34 seconds (fast grfdrv)
  2Mhz  6809 (Coco3) at 640x192x 4-color -  55 seconds (RSDOS Basic)

Previous tests drawing lines and circles had also shown the same ratio between
the 68K and L-II fast grfdrv... about 5:1.

Now note that the MM/1 was moving twice as much data, because it was in
16-color mode vs 4-color on the CoCo. So I reran the fast grfdrv L-II test
using 16-color mode (same number of PUTs) to be more fair...

  2Mhz  6809 (Coco3) at 320x192x16-color -  54 seconds (fast grfdrv)

Now the 68070 shows up as almost 10 times as fast. Starting both tests at the
same time really shows this speed diff up... the MM/1 goes splat! splat! splat!
onto the screen and finishes, while the coco continues for what seems like an
eternity. And I had been so proud of my fast grfdrv Puts .