Bugs Found
----------

1. pushj cleared T2 after setting it
2. if timer autoadjust is enabled, timer diagnostic may fail,
   depending on host CPU speed
3. DFAD/DFSB should use FP_ONES instead of ONES
4. TLB physical address max = 1MW, tested in diagnostic
5. DPB does read/write, not read-modify/write
6. Fetch error takes priority over traps, due to prefetching
   of next instruction
7. HSB is 36b, was 32b
8. CPU and PAG devices had mismatched types
9. non-zero sections in Tops-20 paging section indirect may
   cause non-existent memory error, due to microcode "error"
10. PXCT test for user mode was backward
11. Timer interrupts were not implemented in Tops-20 indirect
   chains
12. epta/upta hit known bug in VC++ implementation of 64b
   data types
13. final W calculation in Tops-20 paging was incorrect
14. Timer representation lost sub msec values
15. UBA initialization reset the UBA itself
16. RHCS1: writing IE cannot trigger an interrupt
17. Tape bootstrap was set to 800bpi instead of 1600bpi
18. FIXR off by 1 in testing for lower limit to process
