[Simh] XXDP V2.2 problems.

Mon Dec 28 10:26:25 EST 2015

Hello!
Where's 2.5 stored? I have copies of both 2.2 and 2.3 from the IBIB
site, and the stuff from Bitsavers. But 2.5? When was that created?
And where would I find it?
But that is a good start.
-----
Gregg C Levine gregg.drwho8 at gmail.com
"This signature fought the Time Wars, time and again."


On Mon, Dec 28, 2015 at 10:16 AM, Johnny Billquist <bqt at softjar.se> wrote:
> Well, the difference between the 11/23 and 11/23+ is actually that the
> former only supports 18-bit addressing. The 23+ added the 22-bit addressing.
> Although, actually finding real 11/23 CPUs are unusual. Most were upgraded
> to 23+, or were actually 23+ from the start.
> (That is, unless I have a bit error somewhere in my memory.)
>
> When XXDP V2.2 is slightly old. Why are you running that, and not 2.5? Also,
> unfortunately DEC had a tendency to break XXDP on older machines when they
> made changes. XXDP was rather poorly maintained.
>
> When you are booting XXDP on your 11/23, it halts, but when you continue it
> says that it was unable to boot XXDP-XM, and instead boots XXDP-SM. So
> obviously it tries -XM by default, so I'm unsure why you think that it's
> booting -SM at any time normally.
>
> And when -SM boots up it reports 28KW of memory, which seems consistent with
> a small memory machine, and that -XM would not be able to boot. So, when you
> are booting XXDP on your 11/44 or 11/23+, are you really sure you only have
> 64Kbyte memory configured? I would not expect -XM to boot then either.
>
>         Johnny
>
>
> On 2015-12-28 16:00, Mattis Lind wrote:
>>
>> I have some troubles running a known working XXDP V2.2 image in SimH on
>> a 11/23 (without +), 11/03, 11/04, 11/05 and 11/20.
>>
>> I have tested this on a PDP-11/44 and a PDP-11/23+ CPU and it works
>> fine. Testing the same image in SimH on 11/23+ and 11/44 config with
>> 64kbyte memory starts the XXDP fine.
>>
>> https://dl.dropboxusercontent.com/u/96935524/xxdp.dsk
>>
>>
>> Now I have to be honest. I am not entirely sure which CPU configs should
>> be able to run XXDP V2.2 (Small Monitor).
>>
>> But I basically thought that switching to 11/23 (without plus) should
>> work fine since it is very similar to the plus. Just removing the two
>> SLUs and the Boot ROMs would make it identical as far as I can see it.
>>
>> But it doesn't start.
>>
>> sim> b rq0
>>
>>
>> HALT instruction, PC: 000104 (JMP SP)
>>
>> Doing a continue actually makes it to boot:
>>
>> sim> c
>>
>> NOT ENOUGH MEMORY TO BOOT XXDP-XM
>>
>>
>>
>> BOOTING UP XXDP-SM SMALL MONITOR
>>
>>
>>
>> XXDP-SM SMALL MONITOR - XXDP V2.2
>> REVISION: C0
>> BOOTED FROM DU0
>> 28KW OF MEMORY
>> NON-UNIBUS SYSTEM
>>
>> RESTART ADDR: 152010
>> TYPE "H" FOR HELP
>>
>> .
>>
>> But it is not entirely happy since the very simple GKAAA0 cpu test that
>> runs fine in 11/23+ mode fails.
>>
>> .R GKAAA0
>> GKAAA0.BIC
>>
>> HALT instruction, PC: 000104 (JMP SP)
>> sim>
>>
>> I know that SimH is not supposed to be able to run the diags but what is
>> the difference on a SimH level between 11/23 and 11/23+ that causes one
>> to run and the other not?
>>
>> Then I tested some other CPUs:
>>
>> 11/34, 11/40, 11/44, 11/45, 11/60, 11/70, 11/73, 11/83, 11/84, 11/93
>>
>> The all can start XXDP V2.2 (SM) and run GKAAA0 fine.
>>
>> But
>>
>> 11/03 and 11/23 give me the halt. In the 11/03 case it is not possible
>> to do a continue.
>>
>> Testing 11/04, 11/05 and 11/20 all give the same result. It never boots
>> but gets stuck in some loop where it seems to poll the console.
>>
>> Step expired, PC: 150674 (BPL 150750)
>> sim> s
>>
>> Step expired, PC: 150750 (MOV (SP)+,R1)
>> sim> s
>>
>> Step expired, PC: 150752 (RTS PC)
>> sim> s
>>
>> Step expired, PC: 151006 (TST R0)
>> sim> s
>>
>> Step expired, PC: 151010 (BEQ 151002)
>> sim> s
>>
>> Step expired, PC: 151002 (JSR PC,150664)
>> sim> s
>>
>> Step expired, PC: 150664 (CLR R0)
>> sim> s
>>
>> Step expired, PC: 150666 (MOV R1,-(SP))
>> sim> s
>>
>> Step expired, PC: 150670 (TSTB @#177560)
>> sim> s
>>
>> Step expired, PC: 150674 (BPL 150750)
>> sim> s
>>
>>
>> SimH is built from head:
>>
>> sim> sh ver
>> PDP-11 simulator V4.0-0 Beta
>> Simulator Framework Capabilities:
>> 32b data
>> 32b addresses
>> Ethernet Packet transports:PCAP:NAT:UDP
>> Idle/Throttling support is available
>> Virtual Hard Disk (VHD) support
>> Asynchronous I/O support
>> FrontPanel API Version 1
>> Host Platform:
>> Compiler: GCC 4.2.1 Compatible Apple LLVM 5.0 (clang-500.2.76)
>> Simulator Compiled: Dec 27 2015 at 17:51:17
>> Memory Access: Little Endian
>> Memory Pointer Size: 64 bits
>> Large File (>2GB) support
>> RegEx support for EXPECT commands
>> OS clock resolution: 1ms
>> Time taken by msleep(1): 2ms
>> OS: Darwin localhost 12.5.0 Darwin Kernel Version 12.5.0: Sun Sep 29
>> 13:33:47 PDT 2013; root:xnu-2050.48.12~1/RELEASE_X86_64 x86_64
>>
>>          git commit id: ea4d9a16
>>
>> Tested SimH 3.9 and it does the same
>>
>> 11/04, 11/05 and 11/20 all lack MMU if this has to do with it. But 11/03
>> also lack MMU and is not behaving the same, although not booting. The
>> 11/23 has the MMU but is still not booting while the almost identical
>> 11/23+ boots just fine.
>>
>> Well. If someone can help me sort this out I am would be happy. My next
>> step is to try to boot the same image on a real 11/04, 11/03 and a 11/23
>> (without +) to see if that works. Just need to toggle in that long
>> bootstrap.
>>
>> /Mattis
>>
>>
>>
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>>
>
> --
> Johnny Billquist                  || "I'm on a bus
>                                   ||  on a psychedelic trip
> email: bqt at softjar.se             ||  Reading murder books
> pdp is alive!                     ||  tryin' to stay hip" - B. Idol
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