On 18 Jul, Hans H?bner wrote: See: http://www.hp1000.com/main.htm S.F. is already informed... ;-) -- tsch??, Jochen Homepage: http://www.unixag-kl.fh-kl.de/~jkunz/

An A600 does not have blinking lights, nor switches. Its a smallish box with no front pannel. Those disappeared from HP systems like the 21MX series. (The A600 is based on a LSI chip version of the 21MX machines) In fact, machines line the 21MX series (2113, etc) have switches and lights, but very few blink while the machine is running. Once the CPU enters the run state the front panel leds display the contents of the S register which is rarely changed by HP software. If you run HP Basic, the extend and overflow lights will flicker for you, but honestly, this is no blinkinlights machine (like a 2114,5,6, or something like a PDP 11/40). You can write small loops to write to the S-reg and make the machine ~look~ sorta like a true blinkinlights machine though. If you have a 2113-style machine and think its power supply is bad, your probably only missing a small plug on the back of the power supply. Without this plug the machine powers up but the front panel will be locked out after failing the power-on self test microcode. This is commonly mistaken for a toasted power supply. Check the back of the chassis at the rear of the power supply. There should be 3 connectors. One is the power controller input, another is the power controller output. These can be ignored. The third connector is for a battery backup unit. Unless you have the battery backup unit connected by its cable, you need to jumper some pins to get your machine to power up correctly. "R. D. Davis" wrote: