Some pointers needed on a 11/70

On Jan 8, 10:44, The Wanderer wrote: you That's a pity, bacause he manual for the MK11 system has a lot of troubleshooting flow charts -- too much for me to try to reproduce. And it has the setup instructions, of course. switches for the box. It might work with one, though. Yes, that's what I meant. The three thumbwheel switches on the left set the start address of the box, in 32KW blocks. That's the smallest size you can have in a box, and since the arrays are either 16KW or 64KW I think you need to have at least two (but you can have an odd number, eg 3, after that -- it just won't do any interleaving). Anyway, set these three to zero. The other thumbwheel (?) switch sets the external interleave; it has to be set to zero unless you are interleaving between multiple boxes. Then the cards have to be in the correct slots. Looking from the front, slot 1 is on the right, and slot 26 is on the left, PSU regulators are at the back. The address buffer (M8158) must be in slot 13, the data buffer (M8159) in slot 15. The #0 Control A board (M8160) must be in slot 11 and the #1 Control A board in slot 16. The #0 Control B board (M8161) must be in slot 10 and the #1 Control A board in slot 17. The #0 controllers handle the even-numbered arrays, in slots 2...9; the #1 controllers handle the odd-numbered arrays, in slots 18...25. Slots 1,12,14,26 are not used. You must set the power-fail jumpers on the M8158. The manual says W1 out, W2 in; W3 out, W4 in. I'm not sure if that's always true. I don't know what you do if you don't want the battery backup! You must also put terminators on the outgoing connectors on the address and data buffers of the last box (the only box, in your case). These are H873 terminator packs, four altogether, one for each BC06R cable. The incoming cables go on J1 and J3 (nearest the long edge of the board), and the terminators go on J2 and J4. You MUST put the screws in the terminators, as that's how they get the power. The first array, #0, must go in slot 9, and the next, #1, in slot 18. Then work out from the centre if you ever add more. There must not be any gaps. If there are some 16K boards and some 64K boards, the 16K boards must all be before the 64K ones. I didn't see anything about switches on the data buffer. The address buffer is described as having three switches to set the CSR address of the box. For the first box, set address 17777100 by setting S1, S2, and S3 all closed. For the next box, open S1. For the third, open S2, close S1. And so on. Ech box uses two words for the CSR. The MK11 logic checks the address on the bus to make sure it's between the limits set by the size register in the CPU, and it's start address. If the address on the bus is less than the box's start address, or higher than the size register, it will not respond. That's not an entry point! It's not even executable code, it's the ROM Identification word. It contains the ASCII characters "B0" to identify the ROM. The only entry points are: 773x04 to boot without diagnostics 773x06 to boot with diagnostics aaaaaa address dependant on the bootstrap ROM version, which jumps to 765564 in the diagnostic ROM 765564 JMP to start of diagnostics 765000 start of disgnostic code Obviously there are other points at which you could enter the diagnostics, but you'd need to set some things in memory and registers first. BTW, I discovered you can disable the cache by setting 000014 in the status register at 17777746. If the cache is faulty, but enabled, the memory box won't work properly, apparently. I don;t think that's your problem, though. More like a start address error. The first part of the troubleshooting flowchar starts by saying that you want to boot XXDP and run the MK112 diagnostic program :-) Well, obviously you can't do that, but it does say that if you can't boot, then first check ALL the power supplies (sound advice anyway). The next part of the flowchart goes like this: 1) Can you boot XXDP? If "no", is the memory box ON LINE? If "no", put it ON LINE and go back to (1) If "yes", is MEM PWR READY lit? If "no", "ZAP 200" [I have no idea what this means!] If "yes", suspect (in this order): BA11K regulator 7014251 battery backup regulator 11/70 Unibus problem If "no", reverse or replace the grey box control cable If "yes", is "UNCORR ERROR"? If "yes", go to next sheet [which is too complex to type] If "no", is there an "ADDR ERROR"? If "yes", suspect (in order): bad or loose BC06R cable address interface, M8158 11/70 cache fault If "no", halt CPU power memory box off power memory box on again Is there "CONFIG ERROR"? If "yes", install arrays properly suspect Control A (M8160) on right side If "no", is "SELECT PANEL" lit? If "yes", go to next sheet If "no", set "FORCE FRONT PANEL" Is it lit? If "no", suspect (in order): "Reset Box" control cable switch or light on box controller data buffer, M8159 If "yes", suspect (in order): data buffer, M8159 address buffer, M8158 Maybe this will be of some help. [...] I wonder if it was trying to store data in 000700...000706 (which it does at the very start of the diagnostics), getting a bus error (no memory), trying to access the trap vector at the bottom of memory, getting a bus error for that too, and just getting stuck until you halted it. -- Pete Peter Turnbull Network Manager University of York