From DAGwyn@null.net Fri Feb 15 10:23:53 2002 Date: Fri, 15 Feb 2002 06:18:08 GMT From: Douglas A. Gwyn To: info-pdp11@village.org Subject: Re: looking for M8981 (PDP-11/93) DIP switch settings & diag LED info Gooijen H wrote: > in slot 1 A-B: M8981 PDP-11/93 That's a KDJ11-E (-EA or -EB depending on amount of RAM). Make sure jumpers W1 and W2 (near edge connector) are installed. Check fuses F01, F02, and F03, which protect the DC supply lines to the connectors. Check the little battery next to the EEPROM. > On the M8981 are 8 diagnostic LEDs, from top to bottom a yellow, 3 > red LEDs, a green and 3 red ones again. > I call them yellow, red 1-2-3, green, red 4-5-6. They're *all* on top.. The yellow LED indicates +5V power. The next three are red "diagnostic" LEDs, the next is a green DCOK monitor, and the last three are red "diagnostic" LEDs. These diagnostic LEDs are mirrored as octal digits in the segmented display on the console/SLU panel. > When the system is turned on (with HALT button in) the display on > the rear panel reads "7.7." and all LEDs on the CPU module are on. > When I push the HALT button out and press the RESTART button, the > display reads "0.4." and the diagnostic LEDs are as follows: > yellow - on > red 1 - off > red 2 - off > red 3 - off > green - on > red 4 - on > red 5 - off > red 6 - off. > What does this mean? RESTART starts executing from the ROM, skipping the normal power-on tests; what happens next depends on what parameters are stored in EEPROM, which can be changed via Dialog/Setup Mode provided by the ROM. (If Forced Dialog is set [see below] then you have a chance to change what is in EEPROM before those parameters are used.) The indicators: +5V is present, DCOK asserted (meaning that RAM was preserved across the power outage), diagnostic 04, which merely means the ROM has completed tests and is in Dialog Mode (see below). After a successful device boot the diagnostic code will be 00. > The rear panel that connects to the M8981 in my BA23 box has the > following parts on it: > + 8 9-pin D-shape (DE-9) connectors for 8 extra terminals > + 1 25-pin D-shape (DB25) connector with "CONSOLE" text next to it > + 2 7-segment displays > + 1 DIP switch block with 8 switches The DB25 is of course the console serial port, hard-wired for 8n1 (8 data, no parity, 1 stop bit). Switches 6,7,8 set the baud rate; for 9600bps: ON,OFF,ON. (For 1200bps, change all three.) The other D-connectors are Serial Line Unit (SLU) ports (for additional terminals, modems, etc.). To enable the console/SLU, switch 1 must be OFF. Switches 2,3,4 select the boot device 1 through 6, which are assigned to devices via EEPROM parameters that can be set up in Dialog Mode. (Interpret as OFF=1,ON=0; sw2=high-order-bit, sw4=low-order-bit.) Set these all OFF (normal auto boot mode) until you get things set up. Switch 5 when ON enables "forced Dialog" after ROM tests are complete, i.e. interaction via the console SLU/TTY, highly recommended until you get the system booting smoothly. In Dialog Mode there are menus and help, which may be enough fo you to set things up right; otherwise get a copy of the KDJ11-E CPU System Maintenance Manual, EK-403AA-MM-001. Probably the best thing is to select the reset-to-factory- defaults as a baseline, and remember to save-in-EEPROM. > The M8981 board has on the front side a 40-pin male header, next > to it are the 8 diagnostic LEDs followed by a 50-pin male header. > Behind the LEDs is an other DIP switch module. The DIP switches duplicate the functions of the switches on the console/SLU panel. For normal operation from the console/ SLU panel, move the on-board switches all to the OFF position. > I connected a VT set at 9600 Bd to the "console" DB-25 connector. > Nothing appears on the screen. The SLU is hard-wired for 8n1 (8 data, no parity, 1 stop bit). Set the various switches as I desribed previously. When the Dialog Mode is entered (after tests complete), you should see a menu of commands etc. on the console. > The DIP switches on the rear panel are set as follows: > (left) (right) > +-----------------+ > | # # | > | # # # # # # | > +-----------------+ Assuming that "right" is closest to the DB-25 connector, the switches are numbered 1 through 8 from left to right. So the only thing you probably need to do to get started is to change switch 5 to ON (up) to force Dialog. ---------- To unsubscribe (or subscribe) from (to) this list, send a message to info-pdp11-request@village.org, with the first line of the message body being "unsubscribe" or "subscribe", respectively (without the quotes).