identify mainboard by Young Micro Systems

Young Micro Systems Inc. [ / 6259]

VS486G-3VL-6B 40-2800-006259-00111111-121593-SYM WAG-H Symphony Wagner 3VLB 8ISA 4SIMM72
VS486F-3VL 40-0700-006259-00101111-111192-SYMP-F Symphony 3VLB 8ISA 8SIMM
?? 40-100-006259-00101111-060692-SYMP-H SL82C461 SL82C465  
MB-SY3486-v22 40-0100-006259-00101111-060692-SYMP-F   486 VLB