MiniB3D

Why without using TurnEntity ? It offers prob. the most easy solution. Then you can create a Pivot, attach the Camera to it, move the Camera back and then turn the pivot during the loop.
Anyway, my maths are worthless, but I noticed that PointEntity has an optional 'roll' parameter. You could maybe insert (G_Camera_Rot_Z+90) there.
It sort of does the job, but not quite: the movement seems rather typical

Import sidesign.minib3d

Graphics3D 1024,768,32,2

chess = CreateCube()
ScaleEntity chess, 1, 1, 0.01


cam = CreateCamera()

MoveEntity cam, 0, 0, -15

ang = 0

Repeat

	ang = ang + 2

	x# = Cos(ang) * 5
	y# = Sin(ang) * 5
	z# = -5
	
	PositionEntity cam, x, y, z
	PointEntity cam, chess, ang + 90

	RenderWorld
	Flip

Until KeyHit(key_escape)

End