New PDP-11 stuff
ggs at shiresoft.com
Wed Feb 15 22:39:26 CST 2006
I just thought I'd give an update on the various progress on the "new"
PDP-11 stuff that I'm working on.
As you all know the KM11 replica is now available. I have some
"accessories" made up for it (actually someone did them on their own and
I bought them). The accessories include some really cool plastic that
allows the overlays to be set up on the board. I'll put some more
information up on my website (http://www.shiresoft.com/products)
shortly. I still have to make up the actual overlays themselves.
I'm almost ready to send the MEM11A board out for fab. The layout has
passed all of the checks (both EagleCAD and the board house). So I
expect to have production boards ready by the end of April (protos back
by end of February, debug, etc). Production boards (to get "reasonable"
pricing) take 4 weeks. Just to let y'all know now, I'll need some firm
orders before I go and build the production boards. To get the price
I've indicated my website, I have to fork over ~$2K for the production
I'm also finishing up a design for a "Unibus Analyzer". One of the
problems I've had in debugging Unibus systems has been to:
1. get all of the signals grouped reasonably so I don't have to
keep counting pins (and half the time getting it wrong) on the
2. having reasonable triggers
3. being able to "see" all of the signals at once.
So, what I've done is design a board that goes in any SPC slot (...OK so
it's not strictly Unibus...shoot me):
1. buffers and groups all of the unibus signals for easy access for
a scope and/or logic analyzer probes (ie all address signals are
grouped together, all data, etc)
2. provides comparators for the address and data lines to provide
pattern matching to be used as a trigger for scope/logic
3. provides LEDs for *all* unibus signals.
With the recent talk about providing a "cool" front panel for an 11/44,
I think I have an idea. I need to look at the details a bit more, but
here's what I think it'll be able to do:
1. set an address
2. examine contents of memory
3. write into memory
4. run/halt CPU (haven't quite thought that one out completely
5. switch register at a settable address.
It'll be a two board set, one goes into (you guessed it) an SPC slot and
has ribbon cables that go to the "lights & switches" that's mounted
where you want it. It should work in any Unibus 11, but obviously would
be best in 11/04, 11/24, 11/34, 11/44.
I also think that it could be adapted to be used in a Qbus system. I'm
taking the approach that the external lights & switches board would be
common between the Unibus and Qbus versions.
Do folks have other things they'd like done?
BTW the disk emulator project is progressing (but slowly...it's a
reasonably complex design and I want to get it "right"). These other
projects are actually helping me out with it.
TTFN - Guy
More information about the cctech