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| From | Johnny Billquist <bqt@softjar.se> |
|---|---|
| Newsgroups | alt.sys.pdp11, comp.sys.dec, comp.os.vms |
| Subject | Re: QBUS Prototyping |
| Date | 2011-04-18 20:35 -0700 |
| Organization | Update Computer Club |
| Message-ID | <ioivtk$4ss$1@Iltempo.Update.UU.SE> (permalink) |
| References | (1 earlier) <hps7i9$htt$1@naig.caltech.edu> <hr19ad$m2m$1@Iltempo.Update.UU.SE> <WgK6B$GCJWnT@eisner.encompasserve.org> <iohk2q$kmg$2@Iltempo.Update.UU.SE> <iohs8j$ha6$1@pcls6.std.com> |
Cross-posted to 3 groups.
On 2011-04-18 10:26, Michael Moroney wrote:
> Johnny Billquist<bqt@softjar.se> writes:
>
>> On 2011-04-18 05:56, Bob Koehler wrote:
>>> In article<hr19ad$m2m$1@Iltempo.Update.UU.SE>, Johnny Billquist<bqt@softjar.se> writes:
>>>>
>>>> (Oh, and a VAX is not a PDP... :-)
>>>
>>> That's right. No VAX ever implemented the MARK instruction. Now
>>> can you find a PDP-11 programmer who actually used it?
>
>> I used it.
>> But only to test how to, and then decided "never more". :-)
>
> I'm guessing that instruction was developed for some compiler(s) which had
> some bizarre linkages for subroutines, and very few, if any, assembly
> language programmers ever used it, beyond trying to figure out what to do
> with it.
One rumour has it that it was developed in order to extend some patent
or something.
Another would be that they were just crazy.
I've not seen a single compiler use the subroutine linkage that
explicitly makes the MARK instruction meaningful, and besides. It is not
usable if you have split I/D space.
> (next question, which compiler(s) used it?)
I have no idea.
Johnny
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt@softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
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Re: QBUS Prototyping koehler@eisner.nospam.encompasserve.org (Bob Koehler) - 2011-04-18 07:56 -0500
Re: QBUS Prototyping Johnny Billquist <bqt@softjar.se> - 2011-04-18 08:07 -0700
Re: QBUS Prototyping moroney@world.std.spaamtrap.com (Michael Moroney) - 2011-04-18 17:26 +0000
Re: QBUS Prototyping koehler@eisner.nospam.encompasserve.org (Bob Koehler) - 2011-04-18 12:53 -0500
Re: QBUS Prototyping Johnny Billquist <bqt@softjar.se> - 2011-04-18 20:35 -0700
Re: QBUS Prototyping moroney@world.std.spaamtrap.com (Michael Moroney) - 2011-04-19 15:34 +0000
Re: QBUS Prototyping Johnny Billquist <bqt@softjar.se> - 2011-04-19 09:47 -0700
Re: QBUS Prototyping koehler@eisner.nospam.encompasserve.org (Bob Koehler) - 2011-04-18 12:49 -0500
Re: QBUS Prototyping Johnny Billquist <bqt@softjar.se> - 2011-04-18 20:36 -0700
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