Update pdp-10 documentation
PDP-10 update

Implement keep-alive and os-requested reload functions of FE.
Preserve HW config flags during (re-) boot.
Allow IPL30 device to interrupt.
Add 18-bit DMA functions.
Implement DMA to/from I/O space.
Optimize DMA memory mapping - once per page, not once per byte.
Teach SHOW IO to report vectors and BR levels as well as CSR addresses.
Add DUP and KDP to Autoconfigure table.
PDP-10 update: LP20

Add Optical VFU support
Correct some inconsistencies with the hardware.
Add documentation and help.
Flush output file after 10 seconds of idleness to allow external watchers/processors to access entire job without forcing a simulator halt or detach/attach.
Make CR return to column 0, not column 1.
Make DAVFU contents accessible via SHOW.
Initialize RAM structures on power-up reset, but not reboot.
PDP-10 Update: TIM

Fix subtle errors in timer/timebase implementation.
Document mechanisms.
Reduce magic constants by using what the OS sets via wrint.
PDP-10 update

Halt code for Console FE errors
PDP-10 update: CD20

Make the card reader work on TOPS-10 and TOPS-20.
Augmented Image ECO was not implemented.
Simplify UI by defining commands for the various options/models emulated based on the simulator being built.
Document, and make the help conditional on model where that reduces clutter.
Deal with <CR><LF> reading ASCII files (file is opened 'rb' in scp's attach ; it shouldn't be.
Add translation support for DEC 026/029 full 7-bit ASCII, an ANSI standard & used by TOPS-10/20.
Deliver EOF at the correct time(s).
Preliminary support for update to card image spec being negotiated with the author.
PDP-11/VAX update: SHOW IOSPACE

Teach SHOW IOSPACE to output vector and BR addresses as well as CSR addresses.
SCP: Prevent use of uninitialized pointer.