Description:
The trusty old PDP 8.
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Happy birthday!
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DEC announced the PDP-8 - 48 years ago today.
-- Use the BIG mirror service in the UK: [link]
My posts (including this one) are my copyright and if @diy_forums on
Twitter wish to tweet them they can pay me £30 a post
*lightning surge protection* - a w_tom conductor... more »
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indirect addressing of page 0
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since op codes 1 thru 5 let you select the current page or page 0, are there reasons to use the indirect addressing bit with the page select bit set to 0 other than to use auto-incrementing registers?
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Free DEC RL01-A disk drive and disk for PDP 8a
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This is a DEC RL01-A disk drive plus a disk cartridge. It was part of a PDP-8a system. working condition unknown.
Needs a good home with someone who will restore it. Weights around 60 lbs.
I can send photos.
Willard 415-310-6558, will...@solmetric.com
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emphasize the light
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Greetings.
you could try [link] in the particular case of the rectangle;
On the other hand, this extract is appropriate
The main features are then framed by the outline of the face and hair, while the neck and shoulders form an angular support for the head.
You need to record the subtle variations of the... more »
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Drums vs Head-Per-Track Disks
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The original paper on TSS/8 says that the prototype system was
developed to use either a disk (presumably one of the head-per-track
ones that DEC had at the time) or a drum as its swap device. But IIRC,
I read that TSS/8 as delivered could only be used with one of the two
head-per-track disks made by DEC, and not with the model 251 drum.... more »
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Should instructions trash the AC?
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Hi, all.
I am playing with Rob Doyle's PDP8 implementation in VHDL (thanks, Rob!)
and have added an IOT that does stuff with what's in the AC. In order to
"fit in", should my instruction clear the AC afterwards like DCA or is
it OK to just leave the contents alone?
Cheers.
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6120 Chip?
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I have an SBC 6120 board and slowly gathering up the parts ... but no 6120 chip yet?
Does anyone have one they might part with, perhaps an extra or bad DECMate CPU board, etc.
I have a DECmate III with an error 32 (FDC controller issue?) ... that I might salvage the chip from if I get everything else together ... but it... more »
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Wilson RK05 Bridge - WBC-3000 - Need Manuals & Docs
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Wilson Labs made a device that emulates an RK05 drive using a Syquest 135Mb cartridge drive (SCSI). I am told that each Syquest cartridge emulates only a single RK05 drive/cartridge ... therefore using only 1.6Mb of the 135Mb available?
Any way, I have been fortunate enough to acquire one of these units in good... more »
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Which PDP-8, PDP-11, Etc., Components Require Protection from High Humidity?
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...
My memory is that the specifications are "0% to 90% (noncondensing)".
So the question is to protect things from the highest levels of
humidity, and not "high" humidity. I would expect that the worst
problem is if a sudden gust of warm, humid air reached cold hardware,
which might cause the hardware to be colder than the dewpoint of the... more »
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