What frame buffers are/are not supported in the Ultra machines?
This information is taken from the Sun Ultra 1 Creator Series System Product Notes Part no: 802-4149-10, Rev A, January 1996. This document contains the following information: Frame Buffers Not Supported in Ultra Series Systems: GS, GT, GT2 (sbus adaptor card), GX, GX+, ZX2 (TZX) Not listed above, but also unsupported, are the CG3 and the SX expander card.