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- Makefile: drop ISE targets except for w11a - rtl/sys_gen/**/*.*mfset: accomodate recent changes - rtl/w11a - pdp11_dpath.vhd: remove PCOUT port - pdp11_sequencer.vhd: remove PC port
16 lines
512 B
Markdown
16 lines
512 B
Markdown
## Known differences between SimH, 11/70, and w11a
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### SimH: vector flow that sets tbit does not trap
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On an 11/70 and on a J11, a vector flow loading a new `PS` with tbit=1 ends
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with a tbit trap.
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On SimH, a vector flow loading a new `PS` with tbit=1 does not tbit trap.
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Confirmed deficiency, will be fixed.
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The w11 implements the 11/70 behavior, the corresponding tests
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are skipped when executed on SimH
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(see [cpu_details.mac](../tools/tcode/cpu_details.mac) test A4.4 part 9,10).
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Tested with SimH V3.12-3.
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