One of the things that worried me was fused multiply add, or FMA instructions. To set expectations, I’ll mention up front that I didn’t find a satisfactory solution. Then I was asked to help investigate what it would take to emulate the Xbox 360’s PowerPC CPU with an 圆4 CPU. I made some contributions to the team that taught the Xbox 360 how to emulate a lot of the original Xbox games – emulating x86 on PowerPC – and was given the job title Emulation Ninja for that work*. These ISA flip-flops did not make life easy. The Xbox three – sorry, the Xbox One – used an x86/圆4 CPU. The Xbox two – sorry, the Xbox 360 – used a PowerPC CPU. The Xbox one – sorry, the original Xbox – used an x86 CPU. We were thinking about releasing a new console, and we thought it would be nice if that console could run the games of the previous console.Įmulation is always hard, but it is made more challenging when your corporate masters keep changing CPU types. The snapshot list shows each snapshot, along with some information, in descending order of most recent creation date.īy right-clicking on a snapshot, or using the left gamepad button, the snapshot can be loaded, bound to a key, replaced, or deleted.Years ago I worked in the Xbox 360 group at Microsoft. In addition, snapshots can be created or overwritten. The snapshots interface is available in the settings menu, available under Machine → Snapshots.įrom here, snapshots can be filtered either by the current title, or game, being played, or by entering part of the snapshot name. Simply connect the appropriate controllers, load the snapshot again, and enter cont in the monitor to continue). If this configuration does not match, an error message will be displayed and the machine will be paused. For instance: if there was a controller connected to Port 1 when the snapshot was created, make sure there is a controller connected to Port 1 before loading the snapshot. Loading a snapshot from the UI will prompt to remount the disc, so this step is not needed.Ĭonnect controllers to match the saved configuration. Launch xemu, load your game disc, then restore the snapshot. Loading a snapshot from the monitor will not re-mount the game disc, so if you load a snapshot and the game then tries to read from disc, it will fail. If using the monitor, load your game disc image as normal.
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