![]() The 603 did not have a dynamic branch predictor, but the 604 did. ![]() The 603 could complete a maximum of two instructions per cycle the 604 could do up to four. I guess this makes sense, because Wikipedia says that the 603 was the first processor to support the full PowerPC instruction set. The earliest record I can find (not that I looked very hard) shows Windows NT supporting the 603 and 604 processors. The PowerPC 600 series started out as a 32-bit processor, with 64-bit support arriving in the 620. Despite not being supported by the flagship operating system, it continued to be supported by Windows CE, and a later version of the PowerPC was chosen as the processor for the Xbox 360.Īs with all the processor retrospective series, I’m going to focus on how Windows NT used the PowerPC in user mode because the original audience for all of these discussions was user-mode developers trying to get up to speed debugging their programs on PowerPC. Windows NT support was introduced in Windows NT 3.51, and it didn’t last long the last version to support it was Windows NT 4.0. ![]() ![]() The PowerPC is a RISC processor architecture which grew out of IBM’s POWER architecture. ![]()
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