* [TUHS] kernel debugging in analogue
@ 2022-07-01 23:38 Steve Simon
2022-07-02 1:52 ` [TUHS] " Al Kossow
0 siblings, 1 reply; 6+ messages in thread
From: Steve Simon @ 2022-07-01 23:38 UTC (permalink / raw)
To: tuhs
i remember a fellow student debugging an lsi11 kernel using a form of analogue vectorscope.
i think it had a pair of DACs attached to the upper bits of the address bus. it generated a 2d pattern which you could recognise as particular code - interrupts are here, userspace is there, etc.
the brightness of the spot indicated the time spent, so you got a bit of profiling too - and deadlocks became obvious.
anyone remember these, what where they called? i think it was an HP or Tek product.
-Steve
^ permalink raw reply [flat|nested] 6+ messages in thread
* [TUHS] Re: kernel debugging in analogue
2022-07-01 23:38 [TUHS] kernel debugging in analogue Steve Simon
@ 2022-07-02 1:52 ` Al Kossow
2022-07-02 1:57 ` Al Kossow
2022-07-02 2:45 ` Grant Taylor via TUHS
0 siblings, 2 replies; 6+ messages in thread
From: Al Kossow @ 2022-07-02 1:52 UTC (permalink / raw)
To: tuhs
On 7/1/22 4:38 PM, Steve Simon wrote:
> anyone remember these, what where they called? i think it was an HP or Tek product.
both tek and hp had products that would show you vectors between points in an 8x8 grid
representing 64k locations
i'm having trouble thinking of the HP part number, it was in the 160x series. it appears
on the cover of an hp journal in the mid-70s
^ permalink raw reply [flat|nested] 6+ messages in thread
* [TUHS] Re: kernel debugging in analogue
2022-07-02 1:52 ` [TUHS] " Al Kossow
@ 2022-07-02 1:57 ` Al Kossow
2022-07-02 2:45 ` Grant Taylor via TUHS
1 sibling, 0 replies; 6+ messages in thread
From: Al Kossow @ 2022-07-02 1:57 UTC (permalink / raw)
To: tuhs
On 7/1/22 6:52 PM, Al Kossow wrote:
> On 7/1/22 4:38 PM, Steve Simon wrote:
>
>> anyone remember these, what where they called? i think it was an HP or Tek product.
>
> both tek and hp had products that would show you vectors between points in an 8x8 grid
> representing 64k locations
>
> i'm having trouble thinking of the HP part number, it was in the 160x series. it appears
> on the cover of an hp journal in the mid-70s
>
>
https://archive.org/details/hp_journal_1975-08/page/n3/mode/2up
^ permalink raw reply [flat|nested] 6+ messages in thread
* [TUHS] Re: kernel debugging in analogue
2022-07-02 1:52 ` [TUHS] " Al Kossow
2022-07-02 1:57 ` Al Kossow
@ 2022-07-02 2:45 ` Grant Taylor via TUHS
2022-07-02 2:50 ` Al Kossow
1 sibling, 1 reply; 6+ messages in thread
From: Grant Taylor via TUHS @ 2022-07-02 2:45 UTC (permalink / raw)
To: tuhs
[-- Attachment #1: Type: text/plain, Size: 469 bytes --]
On 7/1/22 7:52 PM, Al Kossow wrote:
> both tek and hp had products that would show you vectors between
> points in an 8x8 grid representing 64k locations
>
> i'm having trouble thinking of the HP part number, it was in the 160x
> series. it appears on the cover of an hp journal in the mid-70s
Now I want to nudge / pester Curious Mark to see if he has the equipment
to demonstrate this on one of his videos. }:-)
--
Grant. . . .
unix || die
[-- Attachment #2: S/MIME Cryptographic Signature --]
[-- Type: application/pkcs7-signature, Size: 4017 bytes --]
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2022-07-02 6:22 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-07-01 23:38 [TUHS] kernel debugging in analogue Steve Simon
2022-07-02 1:52 ` [TUHS] " Al Kossow
2022-07-02 1:57 ` Al Kossow
2022-07-02 2:45 ` Grant Taylor via TUHS
2022-07-02 2:50 ` Al Kossow
2022-07-02 6:20 ` Grant Taylor via TUHS
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).