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17 lines
574 B
Markdown
17 lines
574 B
Markdown
## Known differences between w11a and KB11-C (11/70)
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### Stack limit checks done independent of register set
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The 11/70 does a stack limit check (yellow or red zone) when
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- in kernel mode
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- register set 0 active
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- a write via SP with address modes 1, 2, 4, 6 is done,
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thus (sp), (sp)+, -(sp), nn(sp)
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The fact that the check is only performed when register set 0 is active
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is only mentioned as a marginal note in the Technical Manual and can easily
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be checked in the Schematics.
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The w11 does stack limit checks independent of the register set selection
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in `PSW` bit 11.
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