Ready to Power up the 11/04

Basiclaly, the M9301 contains a small amount of ROM containing a PDP11 machine code program to provide the ocnsole emulator and device bootstraps. The PDP11/04 CPU on its own will not talk to a terminal at power-up, it'll just execute machine instructions. Of course, if said intructions are a program that acesses the terminal port then the system talks to the terminal. And that's what happens here. It'll display the output and take the conoslue emulator commands from a terminal (conented to a DL11-something-or-other card) at the standard console terminal address, which IIRC is octal 777560 yo 777566. Note that hardware addresses are 18 bits lont (even on a machine without an MMU) and that word addresses are always even. The DL11 port takes up 4 word addresss, for thee receive control/status register (CSR, it's a term you'll come across time and again), the receive data register, the transmit CSR and the transmit data register. Progrm adresses, are, of course, always 16 bits long. On a machine with out an MMU (like the 11/04), program addresses 000000 to 157777 are left unchanged (The extra 2 bits for the 18 bit address are set to 0), while 160000 to 177777 are converted to 760000 to 777777 The latter range of addresses (4K words) are gernally used for I/O devices, not memory. Now, the M7856 is certainyl a possible terminal itnerfce card for this, but the address can be set by DIP swithces on said board, so it's not certain that' sthe right one. It wuld be perverse in the extreme _not_ to have a DL11 at the normal conosle terminal address, but if you get noting on the connected terminal, checkign the address would not be a bad idea -tony