Lennart Sorensen wrote:
My guess would be that the sun4/1xx and sun4/2xx were not openboot, while the sparcstation and sparcserver models probable all are. So probably sun4c and sun4m were the first with openboot then. Sure is hard to find good details on these old things.
I've got a running SPARCstation IPC (sun4c?) here, and at the command level it appears to be a hybrid between OpenPROM and something older. I'd need to go back through my notes but I think there were some odd limitations.
I think the sun4m (SPARCstation 10, 20 etc.) were all OpenPROM, and the sun4d (SPARCserver and probably SPARCcenter/CS6400) definitely are.