[pdp7-unix] card readers (was ald)
bob at supnik.org
Wed Oct 23 04:57:56 AEST 2019
Timing and error status. The 421 responded to IORS with 4 bits of
status. It appears that the CR01B only responded with ready/not ready.
On the CR01B, some conditions had to be inferred by timeouts.
Mind you, I'm trying to remember this from 50+ years ago. The
card-to-DECtape program I wrote in 1966 has a truncated source, and the
card reader routines didn't make it.
On 10/22/2019 11:19 AM, Warner Losh wrote:
> If they have the same IOTs, then what's different from a simh point
> of view between the two?
> I don't imagine there's many people that have images of cards they'd
> want to bring into the system via this vector, to be honest, so don't
> take my intellectual curiosity about it as an ask to support it :)
> On Tue, Oct 22, 2019 at 4:48 AM Bob Supnik via pdp7-unix
> <pdp7-unix at minnie.tuhs.org <mailto:pdp7-unix at minnie.tuhs.org>> wrote:
> The 18b PDP service listing (from 1972) says that PDP-7 serial #34
> Bell Labs Unix machine) has a CR01B. The CR01B and the 421 have
> identical IOTs, hence the confusion. See pages 81 and 86 of the PDP-7
> On 10/21/2019 10:59 PM, Phil Budne via pdp7-unix wrote:
> > Bob Supnik wrote:
> >> It's probably a CR01B; I doubt if Bell could afford a Type 421.
> > I looked at the card reader instructions:
> > crsf = 0706701
> > crrb = 0706712
> > crsb = 0706744
> > and it looks like it was a 421.
> > I don't know how much the Type 421 cost, but this was a well
> > system: The Burroughs disk was one used as a swap device on KA10
> > sharing systems, and the graphics system was custom built, and
> > described as "as large as the CPU". I believe it was the
> protype for
> > the Graphic II systems, capable of interactive filter circuit
> > analysis, which I imagine was useful to Ma Bell.
> > Bell Labs was responsible for the Karnaugh Map, the modern solar
> > the transistor, the laser, the MOSFET, the communications satellite,
> > the discovery of cosmic background radiation, the first computer
> > the CCD, CFDM ... A research powerhouse, including a lot of basic
> > science. It doesn't seem like any promising research topic was
> out of
> > bounds.
> > I'm only surprised that the PDP-7 didn't have more than one 8K
> > bank (as I can't imagine they wouldn't have used it). The display is
> > smart (there is discussion in [Sutherland68], that it may not
> > for the next step on the the circle of reincarnation past the 340
> > because PDP-9 was largely idle and available to handle display list
> > updates) and the "hard work" (circuit analysis) was being done on a
> > GECOS mainframe....
> > The production Graphic II systems were PDP-9s, so I think it likely
> > Ken found the PDP-7 as a cast off prototype when 9's became
> > [Sutherland68]
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