Those interested can download schematics for the ACI90 / WD9000
PascalMicroengine from my FTP site :
ftp.dreesen.ch/WD9000
You might notice sheet 5 missing, that is just the pinout of the PCB edge
connector.
AFAIK these are not available elsewhere. More to follow whenever I get around
to i
On 11/5/15 10:40 AM, Jos Dreesen wrote:
And then around 100 / 150 8" floppies to image
when it rains it pours..
http://www.ebay.com/itm/311470113149
Eric Smith and I have been looking for these for a long time.
They are BASF floppies, though.
On 11/5/15 3:55 PM, Al Kossow wrote:
On 11/5/15 10:40 AM, Jos Dreesen wrote:
And then around 100 / 150 8" floppies to image
when it rains it pours..
http://www.ebay.com/itm/311470113149
Eric Smith and I have been looking for these for a long time.
They are BASF floppies, though.
an
Eric Smith and I have been looking for these for a long time.
They are BASF floppies, though.
As are mine... ( some 3M and CDC disk also part of the haul )
Does that mean they will need baking ?
Jos
On Fri, 6 Nov 2015, Jos Dreesen wrote:
Eric Smith and I have been looking for these for a long time.
They are BASF floppies, though.
As are mine... ( some 3M and CDC disk also part of the haul )
Does that mean they will need baking ?
Never had any problems with 8" BASF floppies (and 5ΒΌ" BTW).
On 11/5/15 9:06 PM, Jos Dreesen wrote:
As are mine... ( some 3M and CDC disk also part of the haul )
Does that mean they will need baking ?
Yes. I was going to try what I use on one, white board cleaner.
Chuck has not had good luck with BASF recovery.
On Fri, Nov 06, 2015 at 09:56:39AM +0100, Christian Corti wrote:
> On Fri, 6 Nov 2015, Jos Dreesen wrote:
> >>Eric Smith and I have been looking for these for a long time.
> >>They are BASF floppies, though.
> >
> >As are mine... ( some 3M and CDC disk also part of the haul )
> >Does that mean they
On 11/5/15 6:57 PM, Al Kossow wrote:
On 11/5/15 3:55 PM, Al Kossow wrote:
On 11/5/15 10:40 AM, Jos Dreesen wrote:
And then around 100 / 150 8" floppies to image
when it rains it pours..
http://www.ebay.com/itm/311470113149
Eric Smith and I have been looking for these for a long time.
T
On 11/9/15 6:04 AM, Brad Parker wrote:
I was wondering about software. Is anyone planning to turn those schematics
into verilog?
Help would be nice reverse-engineering the chipset.
I also picked up some of the Russian versions of the instruction decode chip.
On Mon, Nov 9, 2015 at 7:04 AM, Brad Parker wrote:
> I was wondering about software. Is anyone planning to turn those schematics
> into verilog?
I'm working on dumping the microcode.
The CP2161 control chip and CP2171-nn microms are probably the same as
the corresponding CP1621/CP1661 and CP163
On 09.11.2015 15:11, Al Kossow wrote:
On 11/9/15 6:04 AM, Brad Parker wrote:
I was wondering about software. Is anyone planning to turn those schematics
into verilog?
Help would be nice reverse-engineering the chipset.
I also picked up some of the Russian versions of the instruction decod
On Mon, Nov 9, 2015 at 12:29 PM, Jos Dreesen wrote:
> Furthermore there seems to have been variants of the Microengine with and
> without the interrupt priority encoder.( WD2083-U04 )
> Anyone aware of these variants ?
All of the WD900 boards I've seen have the WD2083-U04, but I don't
think the M
On 09.11.2015 20:15, Eric Smith wrote:
On Mon, Nov 9, 2015 at 7:04 AM, Brad Parker wrote:
I was wondering about software. Is anyone planning to turn those schematics
into verilog?
I'm working on dumping the microcode.
Your post overlapped with mine...
The WD9000 board contains one WD c
On Mon, Nov 9, 2015 at 12:39 PM, Jos Dreesen wrote:
[about the WD2083U-04]
> It is indeed an interrupt priority encoder.
> I believe it is identical to the am25ls2513, as that is what is used in and
> early version of the schematics.
Interesting. I'd never seen any official schematics before you
Note that there is (at least) one error in the schematics. Two pins of
the WD2803U-04 are labeled 11, and pin 1 is not shown. The DRQ1B-
signal should actually be on pin 1.
I wrote:
> I might at some point contrive a test fixture to verify
> the WD2083U-04 behavior against the Am25LS2513, to determine whether
> there are any changes.
The Am25LS2513 has no internal state (flip-flops), and most likely
even if the WD2083U-04 has differences, it probably doesn't have
int
On 11/10/15 2:00 AM, GerardCJAT wrote:
Help would be nice reverse-engineering the chipset.
I also picked up some of the Russian versions of the >instruction decode chip.
Any idea how one can do it ???
The same way the other NMOS devices like the 6502 have been done. Mapping the
photos to
My problem is I've not done it before. I also have the
logic-analyzer-on-a-chip out of the 165xx series shot but
not analyzed.
http://siliconpr0n.org/archive/doku.php?id=mcmaster:hp:hp-c5_1fi1-0001
Don't you also need to "delayer" the chip to get all the hidden
features? I thought the pr
On Nov 10, 2015 2:40 PM, "Brad Parker" wrote:
>
>
> Don't you also need to "delayer" the chip to get all the hidden
features? I thought the process of reconstructing the polygons required
that each successive layer be exposed. From the "top" I'd think you'd only
see a single metal layer. But t
On Tue, Nov 10, 2015 at 1:39 PM, Brad Parker wrote:
> Don't you also need to "delayer" the chip to get all the hidden features?
> I thought the process of reconstructing the polygons required that each
> successive layer be exposed. From the "top" I'd think you'd only see a
> single metal layer.
On 11/10/15 5:50 PM, Eric Smith wrote:
On Tue, Nov 10, 2015 at 1:39 PM, Brad Parker wrote:
Don't you also need to "delayer" the chip to get all the hidden features?
For late 1970s coarse geometry NMOS with only one metal layer, it's
usually possible with only a single photomicrograph, es
fyi: from the 6502 faq:
/* How do you turn bitmaps into polygons?/
We draw them in our custom Python app. We spent about two months
looking at automatic vectorization and using the bitmaps to create
polygon fragments, but neither of these was better than just sitting
down and clicking out th
On 11/10/15 3:47 PM, Brad Parker wrote:
but what is special about the HP 165xx chip which Al referenced?
Variations of that ASIC are the core of HP's logic logic analyzers for a LONG
time
(at least while they were using 68K processors).
One of my back burner projects has been to understand ho
On 11/10/15 3:56 PM, Brad Parker wrote:
fyi: from the 6502 faq:
/* How do you turn bitmaps into polygons?/
We draw them in our custom Python app. We spent about two months looking at
automatic vectorization and using the bitmaps to create polygon fragments, but
neither of these was better th
On Tue, 10 Nov 2015, Brad Parker wrote:
So, since it appears to be NMOS with a single metal layer, it seems like one
could feed the jpeg into a program and find all the polygons.
Given a vector image file with shapes properly assigned to layers, an LVS
tool can extract a netlist.
In a one-s
The WD9000 Pascal Microengine main box does not include floppy drives.
It can support up to four floppy drives, which can be either 8-inch
(500 kbps transfer rate), or 5.25-inch (250 kbps transfer rate), as
selected by a DIP switch setting on the WD900 board. Unfortunately
the DIP switch directly
Thanks for the writeup, luckily i have a complete system with 2x8" floppies.
It is a SE-90, like this :
http://www.thepcmuseum.net/details.php?RECORD_KEY%28museum%29=id&id%28museum%29=603
A very early system, and handwritten notes in the docu suggest it was a
temperamental beast.
I do wonde
On Wed, Nov 18, 2015 at 2:48 AM, Eric Smith wrote:
> I've designed a simple adapter PCB
[for the DC37S floppy connector of the Western Digital WD900/WD9000
Pascal Microengine]
> To support proper head load or motor spinup timing, I put an optional
> PIC microcontroller and DIP switch on the adapte
The firmware source code and Eagle files (schematic and PCB layout)
are now on Github:
https://github.com/brouhaha/wd900-fd-adapter
The current Eagle files are rev. 2, which has minor changes from rev. 1:
* kludge connector P5 pin 1 mark corrected, was next to pin 2 on rev. 1 board
* Two DRC cle
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