looking for RX01 device IOTs for the PDP8/e

Gooijen, Henk henk.gooijen at oce.com
Sun Jan 15 03:57:07 CST 2006

Hi Tom,
I did not check my copy of "Intro to Programming", because on an
earlier search for a detailed description of the IOTs for a specific device
(how it works and interacts with the pdp8), I remembered that the RX01
was not among them. I do have the description of the RK05 IOTs, but
that is to big (capacity-wise) for a floppy disk. Perhaps I will someday
have a go at it to simulate RK05 with a 100 Mb ZIP drive ... :-)
Meanwhile, the link that Vince posted got me started: including the
(standard a lot of) comment lines, the "#defines" and memory allocation,
I have all IOTs coded in some 800 lines 6809 assembler.
I guess that max 200 lines more will make it complete to put the RX01
in the simulator. As I did the DS32 and the RF08 simulation already,
I have some experience in how to go about, and with the help of Vince,
debugging was not too complicated (the interrupt mechanism got me
puzzled for a while).
- Henk, PA8PDP.


Van: cctalk-bounces at classiccmp.org namens Tom Peters
Verzonden: zo 15-01-2006 03:39
Aan: General Discussion: On-Topic and Off-Topic Posts
Onderwerp: RE: looking for RX01 device IOTs for the PDP8/e

I have the PDP-8e Intro to Programming (1970). I'm not exactly sure what
you're looking for. If you think it's in there, I'd be happy to look for
you. However, all I see here are IOTs for TU58, drum disks, scopes,
recording voltmeters, TTY's, and etc. Nothing that explicitly says RX01.

At 10:55 AM 1/13/2006 +0100, you wrote:
>Great!  Thanks Vince.
>IIRC, I have also gotten the IOTs for the RF08 from Dough's
>site, (and the 'tricky' ones like GTF and RTF), but somehow
>I did not see this RX01 page!
>I have printed those pages already to study them!
>- Henk, PA8PDP.
> > -----Original Message-----
> > From: cctalk-bounces at classiccmp.org
> > [mailto:cctalk-bounces at classiccmp.org] On Behalf Of vrs
> > Sent: vrijdag 13 januari 2006 10:40
> > To: General Discussion: On-Topic and Off-Topic Posts
> > Subject: Re: looking for RX01 device IOTs for the PDP8/e
> >
> > From: "Gooijen, Henk" <henk.gooijen at oce.com>
> > > Can anybody point me to where I can get the pdp8 RX01 IOT
> > descriptions?
> >
> > Here's a place that I have used
> >
> > http://www.cs.uiowa.edu/~jones/pdp8/man/rx01.html
> >
> > It is easier (and harder) than you expect because the
> > interface is to the bit-slice micro-controller in the drive,
> > rather than to the bare drive electronics.
> >
> >     Vince

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