Bad Joke. Bad Bad Bad! Front panel for a PC? - test-drb@ccmp.vtda.org

28 Jul 1997

...
  I.E Making a new ROM.  Well,  I do have the IBM PC
manual that has the ROM
 unassembled in it...   I thought those panels worked by playing with the
 lines on the CPU.  Sounds like more work than I have time to do now.  I do
 know that E11 lets you pull this off via the paralell port.  It would be a
 neat trick, if I had time to work at it. 
They do work by playing with the lines on the CPU. However, the 8088 (and
most microprocessors) do not allow you to get to the internal registers
...
 from the bus. It works on the PDP-11 because the
registers have a bus address; i.e., you can DMA into registers.

This stopped being possible on the microprocessor implementations of the
the PDP-11, which is where MicroODT fills in.

Roger ivie
ivie(a)cc.usu.edu