Logo SB180
The SB180, 9MHz
The 9MHz version of the SB180 was essentially the same as the 6MHz version. The processor was the HD64180RP8, spec'ed at 8MHz but run at 9.216MHz. The three 74157 DRAM address multiplexor chips were replaced with faster 74S158 chips. The 12.288MHz processor crystal was replaced with a 18.432MHz crystal. The EPROM was also changed, to provide the new Baud Rate Generator constants for 9.216MHz operation.
Header and Jumper Information
Click on picture for a larger image.

SB180 Home