Recent content by klapperp

Not yet, because I need to re-setup the emulator - something went wrong at my first try, probably related to my 2nd USB to RS232 adapter - I will try it and keep you informed! // Peter

Here are the modified MXV11-A ROM images which work as multi-diskboot images on the MRV11-C. I uploaded both, raw binaries as well as intel hex files. I named them 23s039D1 and 23s040D1 - the "s" stands for "shifted" - enjoy! // Peter

@daver2: ...yes I am happy - the shift of the code does exactly what I hoped - now 773000G executes a multi device boot code and my PDP11/23 boots from DY0 as well as from DY1 :) Unfortunately I currently have no RL devices connected to my system but I am sure that it would also boot from them...

I changed your suggestion a little bit in order to get 4 unique blocks in the test ROM. Therefor I changed your suggested 256 with "100 - 103" and then filled up each block with "0 - 255" wlow() { >$romlow for a in {64..67} do ax=$( printf "%x" $a ) for i in {0..255} do...

It perfectly worked! @daver2: Thanks a lot for your great idea - now it is clear that the board directs me to the position 0003000 in the ROM. This is the beginning of my ODT read at 773000: 773000/000101 773002/000200 773004/000101 773006/000201 773010/000101 773012/000202 . . This is the...

@daver2: I created now two 2k EPROM images with test data on my Debian box, based on what you suggested, as well as a binary image of the TEST.rom: #!/bin/bash romlow="TEST_LO.bin" romhigh="TEST_HI.bin" wlow() { >$romlow for a in {64..67} do ax=$( printf "%x" $a ) for i in...

Cool! Thanks again for yor help ;-) // Peter

@daver2: As I have understood until now is, that the boot multiplexer of the MRV11-C can be configured with my 2716 EPROMS either with a starting address with an offset of 3000 or 7000 depending on the chipset position. Due to the fact that at an offset of 7000 there is nothing in the ROM, the...

@Hunta: But at offset 3000 its's the same, isn't it? Because this would make sense related to the manual. // Peter

There are currently MRV11-C boards for a reasonable price at ebay ;-) https://www.ebay.com/itm/225936634809 I am willing to invest in one more of these, to get this secret solved ... // Peter

Now I made a try with the MXV11-A boot roms at chipset position #7 and jumpered the boot multiplexer to 073000 as described in the manual. The result is the same, the CPU starts to read code and nothing happens :-( @daver2: Yes I can see the RX02 controller and the system boots from it with...

@Hunta: Thanks a lot for your disassemby and the coments ;-) @daver2: What I really want is, to understand the MRV11-C in order to split at the end the MXV11-B boot ROMs into chunks to use them on the MRV11-C, similar to the BDV11 hack with the split KDF11-BJ ROMs. But this is future music...

One more interesting thing, at position 0001000 and 0003000 in the "octal dump" there is the same code. // Peter

My EPROMs look good, I read them in with a programer, dumped the content dan compared it with the original dump files - no difference! You are probably right that at chipset 0 position one of the EPROMs might have been plugged not correctly - I will check this later but ... The code which we...

First I will check my EPROMs ...