+1 You tell em Will!
On Jun 21, 2016 4:05 PM, William Donzelli <wdonzelli at gmail.com> wrote:
> > I have sent Todd his contact info. He is willing to let one person come in and take pics and post to the group. He does NOT want to move one or 2 items of the most value; he wants to move out pallets of stuff. He is not closing shop; he just wants to move out some really old equip that has been there for years.
> Be sure to tell your friend that the mainframe collectors can
> certainly make cubic feet of equipment leave the warehouse quickly!
The 2000 isn't fully compatible either i thought since its one of the few PCs using the 80186 processor. When i acquired mine (also without a monitor and i think without keyboard or software ) i sort of accepted id likely not get it running. But perhaps the ?software is out ?there and less of a concern than i thought.
I didn't know it was compatible with the cm-1 but i never checked what video card mine had.
Still an interesting system historically.
> From: William Degnan
> The problem was a missing KJ11
Ah. Well, if you want to add one (I assume you've just re-jumpered the
machine for the moment), I do have one we can copy (for the PC etch) - I'm
assuming here that originals are now unobtainium.
Also, if you have the KE11-E, but not the KE11-F (the former is a prereq for
the latter), and would like one, I have one I have no use for (Unix doesn't
use that version of the PDP-11 floating point), and would be willing to trade
it for something I do have a use for.
> My error. Lesson: Always check everything.
Yes, always a good rule when dealing with recovered machines. I always take
them apart and go through them completely, verifying all cables, etc from the
> From: William Degnan
> The IOT step is bombing (?) and loops through the addresses:
This may be a pointless question, but just to clear the ground first: the CPU
is otherwise functioning reasonably well? E.g. it's not dropping the 020 bit
when reading words from memory? (That would convert the '220' new PC in the
vector to '200', and produce exactly the behaviour you are seeing.)
If it is otherwise more or less working, so this is specific to IOT trap
handling, I agree with Fritz - a KM11 would be a big help.
I thought I'd throw this one out to those who know more than I about the
I am working with DaveR on vcfed.org/forum who asked me to run the
following program as a test from the front panel:
20 - 220 ; IOT trap vector (New PC)
22 - 340 ; IOT trap vector (New PSW)
200 - 012706 ; MOV #600,SP
202 - 600
204 - 240 ; NOP
206 - 0 ; HALT
210 - 4 ; IOT
212 - 240 ; NOP
214 - 0 ; HALT
216 - 0 ; HALT
220 - 0 ; HALT
222 - 0 ; HALT
START the program running from address 200.
Problem is - The IOT step is bombing (?) and loops through the addresses:
Anyone care to speculate which CPU card is the culprit?
Twitter: @billdeg <https://twitter.com/billdeg>
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On Jun 30, 2016 1:19 AM, "Fritz Mueller" <fritzm at fritzm.org> wrote:
> Hey Bill,
> Do you have a KM11 maintenance card? Guy Sotomayor here sells kits
and/or assembled boards at
http://www.shiresoft.com/products/km11/KM11%20Replica.html. I built one up
myself based on a layout by Tom Uban at
> The easiest way to get to the bottom of this since you have a nice,
short, repro case would be to step through the microcode with a KM11 and
see where it goes awry. From that point, its fairly easy to come of up a
list of boards to swap and/or chips to check.
> If you want to go to the chip checking stage, you'll need some board
extenders and a logic probe, they are pretty cheap. Or you can grab a
surplus logic analyzer and some DIP clips off eBay if you want to get posh!
> I just went through this process with my 11/45, it was pretty educational.
It turns out that I was missing the KJ11 my cpu cards were wired to
expect. On the 11/40 this module is the little M7237 card for space E of
The machine in question did not come with this card, I assumed it was not
needed until I checked the cpu jumpers and discovered my error. Should
have done this 1st!
It was impossible to run the CQKC diagnostic for 11/40 or 11/45 -
Instructions using IOT in particular.
I collect vintage IBM laptops, have just joined the community, and wonder if anyone can help with the following:
1. Can write a Teledisk image of concurrent CP/M for Displaywriter to two 8 inch floppy disks which I can supply?
2. Can solder a cable fie me which will interface an ibm 6360 8 inch floppy to a PC. I am unable to do this myself.
3. I have an external 5.25 floppy adapter/a inside an ibm ps/2 p70 and wonder if the external 37 pin connector is pin compatible with the 37 pin connector of the ibm 6360 8 inch floppy drive?
I thought about connecting two out of the 3 cables from this drive to an IBM displaywriter (supplying the correct voltages etc) and the 37 pin connector to my external 5.25 adapter/a card?
Thanks for your help.
It's that time of year when a young man starts to take stock of
reality (for better or for worse) and decides that his load must be
lightened. This time the machine with on the block is an MAI Basic
Four deskside minicomputer. I'm not sure of the exact model but it
can be seen in the first three pictures in this gallery:
Note: nothing else in that gallery is on offer at this time - maybe
later. However other random hardware may be thrown at you during the
I have not powered it up. I was told it was working when taken out of
service many years ago, but we all know how that goes.
I have some documentation for it that I will be scanning (some of
which is not already on Bitsavers) but I will send it along to whoever
takes the machine afterwards. I do not have any disk or tape media
I'm not looking to get a lot for it - trades would be fine, preferably
for something that I can lift myself, however I am also looking for a
working DEC RX02 drive or a later IBM terminal controller (3174 or
similar) with Ethernet that I can use to run IBM real terminals on
Preference goes to:
1) someone local who can haul it away. I am not presently equipped
to deal with shipping anything this large.
2) someone will will get it sooner rather than later
3) someone who will make it sing again.
If you're coming to VCFMW in September, the storage unit holding the
MAI is just a few miles away from the hotel and we can do the loud-out
then. If you're here sooner, even better.