New subject: MESSAGE NOT DELIVERED: Problems with my PDP 11/24 (was:Question about memory boards used on VAX 11/7xx)

28 Dec 2004

...
   That's the
info I found on the net from a 11/750 FAQ:

 "National Semiconductor Memory Systems: 1Mb memory boards. These
 boards have PWB 551109464-002 B
 PWA 980109464-001 D
 etched on them. They have a push-button switch for disabling the
 board, and a spare memory chip in a socket on the board. Board has
 green and yellow LEDS, which should normally both be on. Disabling
 the board causes the yellow LED to go out, and the red LED on the
 L0016 to come on, indicating bad memory configuration."  
 Those almost certainly aren't UNIBUS memory boards, but are 
 11/750-specific boards. 
Thanks for this information, Patrick.
I guess, I'll have to wait for such a VAX, I haven't one yet ;-) 

Currently, I'm setting up my 11/24.
It comes with an RL02.
Yesterday, I worked on it a bit, checking grant and bus continuity, everything's fine
now.
I found out the bootstrap adress for the RL02 (BOOT Proms are located on the Unibus Map
Module (KT24)) and gave it a try, 
with the RL02 disconnected.
No problems with typing in digits with the VT420 terminal.

This morning, the 11/24 apparently don't accepts commands from the terminal, why ?

On the CPU-Board, the CLK-LED is always illuminated, even when I press the Boot-button.
Then, the RUN - und the PROC-LED
turns on for a moment, that's all.

Yesterday, when I typed in the bootstrap adress of the diagnostics-PROM, the 1 - LED
turned on.
The 0 - LED always remained off.

Today, no typing in is possible.

When I press the boot-button, I obtain something like @000002

I need to know the meanings of the LEDs on the CPU-Board.
Can anyone give me some help ?
In the Maintenance-Card, the functions of the LEDs are described but it doesn't appear
to be on the net somewhere...

Thanks alot in advance !

Pierre  

__________________________________________________________
Mit WEB.DE FreePhone mit hoechster Qualitaet ab 0 Ct./Min.
weltweit telefonieren! http://freephone.web.de/?mc=021201