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docu updates [skip ci]

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wfjm
2022-12-21 12:58:05 +01:00
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doc/simh_diff_red_psw.md
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@@ -1,6 +1,6 @@
## Known differences between SimH, 11/70, and w11a
### SimH: Red stack zone PSW protection
### SimH: Red stack zone `PSW` protection
The 11/70 includes location 177776 in the red stack zone. This is not
documented in the Processor Handbooks, only mentioned in the Technical
@@ -9,4 +9,8 @@ is done after an emergency stack was set up, the vector flow of a fatal
stack errors had concluded, and the handler does a stack push when `SP`
is still 0.
SimH doesn't support this behavior. W11 does.
SimH doesn't support this behavior.
w11 implements the `PSW` protection. This is verified in a
[tcode](../tools/tcode/README.md), the test is skipped when executed on SimH
(see [cpu_details.mac](../tools/tcode/cpu_details.mac) test A3.2).