[Simh] pdp11 fails MAINDEC CPU test 14 D0NA

[Johnny Billquist]

Yes, if the test says that, it must be wrong, since the 11/05 and 11/20 
do not do the same thing here. This is documented in the MicroPDP-11 
Handbook, for example 
(http://www.bitsavers.org/pdf/dec/pdp11/handbooks/EB-24944-18_Micro_PDP-11_Handbook_1983-84.pdf, 
page 379 and forward).

   Johnny

On 2020-07-10 00:37, Paul Moore wrote:
> So the test doc is wrong then, it says valid for 11/05, 20 and 10 (this is the MAINDEC manual dated oct 73)
> I was running with SET CPU 11/05
> 
> Maybe the engineers knew to just ignore that failure, 'don’t worry they all halt there, just hit run, trust me'
> 
> Ran the same test on 11/20 and it passes
> 
> TBC - none of this is my code, either the test or the emulator, running DEC diagnostics on simh v4. This was just an FYI for you
> 
> I am stilling trying to get past the test of executing an IOT with the T bit set, that’s a tough one to get right 😊. SO I have not reached this test yet
> 
> -----Original Message-----
> From: Johnny Billquist <bqt at softjar.se>
> Sent: Thursday, July 9, 2020 3:14 PM
> To: Paul Moore <paulmoore100 at hotmail.com>; simh at trailing-edge.com
> Subject: Re: [Simh] pdp11 fails MAINDEC CPU test 14 D0NA
> 
> This is a test that tests something which is actually implementation dependent. So you need to run the appropriate test on the appropriate CPU.
> 
> More specifically:
> 
> The following processor uses the original content of Rn as source when doing an operation like MOV Rn,(Rn)+
> 
> LSI-11, 11/04, 11/05, 11/10, 11/34, 11/44, 11/45, 11/70.
> 
> The following processors uses the modified content of Rn as source when doing an operation like MOV Rn,(Rn)+
> 
> 11/15, 11/20, 11/23, 11/24, 11/35, 11/40, 11/60, J11
> 
> So, depending on which CPU you are planning to emulate, you need to do this differently...
> 
> And just so you know, there are other implementation defined differences between different models as well, which you probably should research, if you want your emulation to behave correctly...
> 
>     Johnny
> 
> On 2020-07-10 00:00, Paul Moore wrote:
>> Not sure if you are interested but I found that simh fails test 14.
>> (Running the tests on my own emu project and wondered if simh would
>> pass all of these nasty tests too)
>>
>> 007176: 010700                              mov
>> r7,r0                                       ; @.
>>
>> 007200: 012700 006340               mov
>> #6340,r0                               ; @.`.
>>
>> 007204: 010020                              mov
>> r0,(r0)+                 ; ..
>>
>> 007206: 026727 177126 006342                 cmp
>> 6340,#6342                         ; W-V~b.
>>
>> 007214: 001401                              beq
>> 7220                                       ; ..
>>
>> 007216: 000000
>> halt                                                        ; ..
>>
>> If you don’t know these test the general layout is as follows
>>
>> Load pc in r0 (presumably to identify the test if a halt occurs)
>>
>> Run the test
>>
>> Halt if fail
>>
>> Next test
>>
>> Simh halts at 7220
>>
>> This test is verifying the behavior of using the contents of an auto
>> increment register. IE exactly when does the register change value in
>> the instruction flow
>>
>> Mov r0,(r0)+
>>
>> Their test expects the value moved to DD to be the new value of R0. Ie
>> the incremented register value is committed as soon as it is used to
>> calculate the address
>>
>> Simh(v4) (running as 11/05 not tried other models) moves the old value.
>> Ie the register update is not processed until the instruction is
>> complete
>>
>> sim> e r0
>>
>> R0:     006342
>>
>> sim> e 6340
>>
>> 6340:   006340
>>
>>
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>> http://mailman.trailing-edge.com/mailman/listinfo/simh
>>
> 

-- 
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