Is your feature request related to a problem? Please describe.
When I create a IBM PS/2 model 70 (Type 4) machine with a 486SX CPU and no FPU, it shows error code 12903 when booting.

Describe the solution you'd like
I found a PDF document on a PS/2 theme website, and it says this machine has a 486DX daughtboard with an internal FPU. The daughtboard has no 486SX support, and alternative CPUs don't include any model of 486SX.

Additional context
IBM PS/2 model 70 reference

https://ardent-tool.com/8570/Planar_T3-4.html