Solbourne Graphics Board Specifications: (data from a Solbourne Education manual, unless otherwise marked) Board VideoMode Frequency (H/V) Requirements ----- --------- --------- ------------ [* KBus Boards *] I/O Mono 1152x900 /69Hz 1600x1280 89KHz(**)/66Hz a high-res mono monitor! CG30 1152x900 /69Hz Needs 3.2B or greater ROM CG40 ?? /?? 1152x900 /69Hz(**) [* SBus Boards *] sga20 1152x900 /69Hz 1152x900 61.9KHz(*)/65Hz(*) bw20 1152x900 /69Hz 1600x1280 89KHz(**)/66Hz a high-res mono monitor! (*) as obtained from the information report from an HP A4330A monitor this doesn't seem right to me, as the sun video is 61.8KHz/66Hz, which doesn't seem far enough off to cause the HSync problems you see. Maybe i'll explore this at a later date) (**) assumed from other information