Author: Lenard Spencer
Date: 15:28:29 11/19/00
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On November 18, 2000 at 16:01:36, walter irvin wrote: >does anyone know the strongest chess computer was that ran on the 6502 cpu ? Not sure of the dedicated chess computers, but as far as home computer software, one that comes to my mind is Martin Bryant's Colossus programs. I have both Colossus 3 and Colossus 4 for the Atari XL/XE series computers. The differences between the two are (1) C4 offers a (sort-of) 3D view and (2) C4 can also ponder. Its speed is impressive given the effective processor speed. The 8-bit Ataris are clocked at 1.79 MHz, but with display mapping eating up a considerable percentage of CPU time, the effective processor speed drops to around 1.2 MHz. Even then it searches around 200 to 300 nps. I remember a discussion some years back putting its estimated rating somewhere around 1800. I ran two Atari computers side by side, and with pondering turned off it beat every other Atari program I had, including the Spracklens' Sargon III and Larry Atkin's program Chess 7.0, released by Odesta Software. Maybe someday I might post a small history of old (classic) chess programs released for the early home computers, if not here (maybe too much bandwidth?) or on my web page.
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