[Simh] PIP10

[Bob Supnik]

Thanks, Tim. That means the OS/8 image Ian and I are using is configured 
for a TD8E, so I'll debug that code path. It's more difficult, because 
the DECtape emulator has to provide an accurate emulation of the mark 
track, and I could easily have it wrong in 16b- or 18b- mode. (The TD8E 
does run OS/8, so it's probably okay in 12b mode.)

/Bob

On 3/20/2013 8:03 PM, Timothe Litt wrote:
> Meant to include the code that uses DVTYPE and actually picks the type 
> in my earlier note.  Sorry.
>
> If I had to make a random guess, look at the microprogrammed operate 
> codes, e.g SNA CLA; CLL CML RTR;
>
> SETUNT, 0
> STL
> TAD (-7607
> SZA /IF IT IS 7607,
> TAD (7 /ITS UNIT 0
> AND (7
> CLL CML RTR
> RTR
> DCA UNIT10
> TAD DVTYPE
> AND (10
> SNA CLA
> JMP I SETUNT /TC08 - FINISHED
> CLL
> TAD UNIT10
> AND (7000 /TD8E ENTRY POINTS ARE STRANGE -
> TAD UNIT10 /MUST ROTATE UNIT NUMBER LEFT 1
> SZL
> TAD (1000
> DCA UNIT10
> JMS I (TDUSET /SET UP TD8E OPCODES
> JMP I SETUNT
>
> This communication may not represent my employer's views,
> if any, on the matters discussed.
>
> On 20-Mar-13 18:05, Bob Supnik wrote:
>> I tried running PIP10 from the image Ian was using.
>>
>> If the simulator is configured for a TC08, it hangs. It is in a loop 
>> doing IOT 773/JMP .-1, which is a TD8E IOT.
>>
>> If the simulator is configured for a TD8E, it returns an error. I 
>> tried DTA0:/Z and got OUTPUT FILE OPEN ERROR.
>>
>> So the first issue is that PIP10's logic for telling which DECtape 
>> controller is present uses some feature that the simulator is doing 
>> incorrectly.
>>
>> The second issue is what happens beyond that point.
>>
>> /Bob
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>
>