Card Inventory PDP 11/40

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	by Bill Degnan - 06/01/2008 01:23
CARD SLOT POSTITION empty 1 -- (IF PRESENT WOULD BE USED FOR A 7239) empty 2 -- (IF PRESENT WOULD BE USED FOR A 7298) 7232 3 A-F (U WORD) 7231 4 A-F (DATA PATHS) 7233 5 A-F (IR DECODE) 7235 6 A-F (STATUS) 7236 7 A-F (TIMING) 7236 8 A-F (MEMORY MANAGER) 672A 9 D (GRANT CONT.) UNIBUS 9 A-B (RIGHT SIDE OF UNIBUS) UNIBUS 10 A-B (LEFT SIDE OF UNIBUS) M7856 10 F-C (RS232 WITH 19.2 OPTION?) G7273 11 C-D 7891 12 A-F (64k MEMORY) M9312 13 A-B (ROM CARD) 672A 13 D (GRANT CONT.) I am starting to work further and I wish to explore the terminal interface using the M7856. Unfortunately things have been slow because I don't have the M7856, 7891, or M9312 docs (still trying to find). I have the original bootstrap ROM that came with the M9312 still present as it was originally. When I load the address 165144 and examine (I was told this was the address to activat e the ROM), nothing appears to be loaded into memory (just blank RAM: FFF FFF FFF FFF/ 000 000 000 000 etc.) at 165144. When I attempt to activate the ROM (halt, load address 165144, depress enable, and then start). There is no change to the data in memory location 165144. Should it be 765144 because of the memory management card (7236)? Whatever the case I do not get a response from the terminal. I understand from my notes of the conversation I had with the orignal seller that to use the LA 36 DecWriter II with the 11/40 I will have to change the baud rate jumpers or switches on the M7856 from 19.2K to a lower setting for the terminal. So, for the time being I am using a computer with the windows terminal program set for VT 52, 7 bits no parity, and 19.2K baud. I have also tried other settings such as 8 bits no parity, VT 100, etc. I am confident that the computer is looking at the correct COM port. Knowing what I know, I would not expect any terminal output, because there is no program loaded. I have worked hard to find answers and docs on my own, but I am at a stand still at the moment. Any tips are appreciated. NOTE: There's a note on the DEC terminal to indicate that it was upgraded to 1200. In local mode the DEC terminal works OK. Reply