[its-hackers] RDTIM

Christopher Stacy cstacy at dtpq.com
Wed Apr 7 23:17:08 CEST 2021


I remember that comment!
I have no idea what it means.

It is a famous number, one whose famous properties may have nothing to 
do with its use here.

In other words, that comment could possibly mean:
"I saw this magic constant here and haven't a fucking
clue where it comes from or why. But did you know
that  Ramanujan found it fascinating?
So, Dear Hacker, Good Luck To You Too!"


It's obviously related to some KS10 clock register....
I guess we need to check the KS10 hardware doc









On 4/7/21 6:00 AM, its-hackers-request at its.victor.se wrote:
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>     1. Re: Time standing still (Lars Brinkhoff)
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> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 06 Apr 2021 11:29:19 +0000
> From: Lars Brinkhoff <lars at nocrew.org>
> To: Paul Svensson <paul-its at svensson.org>
> Cc: its-hackers at its.victor.se
> Subject: Re: [its-hackers] Time standing still
> Message-ID: <7wim4zabxs.fsf at junk.nocrew.org>
> Content-Type: text/plain
>
> Paul Svensson wrote:
>> The clock on SV has stopped running.
>> I can set it with PDSET, but it stays stuck to whatever I set it to.
>> Where should I look for the problem ?
> I believe you are running KLH10 so it's a KS10.  Checking ITS sources I
> see date and time should come from GPDTIM in SYSTEM; TIME >, and it uses
> the KS10 RDTIM instruction.  You could try putting a breakpoint there.
> Maybe this code has crossed a limit or overflow condition?  What is that
> "interesting number"?
>
>          RDTIM A         ; Read clock into A!B
>          TLC A,1729.     ; "A most interesting number"
>          TLNE A,-1       ; Does the clock look like it has been set?
>           JRST GPDTM2    ; Must have been reset
>          DIVI A,KSFREQ   ; Convert to 60ths
>          SUB A,PDTIME    ; Subtract offset
>
>
>
> End of its-hackers Digest, Vol 48, Issue 2
> ******************************************



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