Hi Michael,
I would be most interested in finding out more about this effort. Do you have
ongoing pictures documenting this effort? I'd love to have a PDP 8, 11, 12
someday, but I don't have the space for something like that much less the cost
involved so I'll have to be satisfied with emulato
Marco,
All keywords on the ZX81 have to be single keypress-type words - not typed out.
The “TO” in your FOR loop is typed by pressing Shift-4. Don’t type “T” “O” or
you will get a syntax error.
Ian
> On Jul 12, 2015, at 11:21 PM, Marco Rauhut wrote:
>
> Hello;
>
> I have here my first Sinc
Hello;
I have here my first Sinclair ZX81 Computer with 16K Ram extension.
To check if the Ram extension works properly i want to write an small
Basic program to check each byte.
The first thing i struggle on is that 1 could not type in a for next
statement.
10 FOR I = 17000 TO 32768
if I type
The RICM Learning Lab was nice and cool today so we spent the afternoon
chasing the "LGP GP=GPC PRESET" in the TC12 LINCtape controller. With a
logic analyzer connected to lots of the TC12 signals were were able to
chase down the signal that is causing the fault. We are now not sure if the
signal b
> Very good explanation, Tony!
>
> Is there any chance that he might need to worry about a pack being inside the
> drive with the heads un-parked, e.g. > from an abrupt power failure?
I would hope not (IIRC all DEC drives are designed to retract heads if the
power fails). If the heads are stil
Further update. The Z80-A CTC appears to be the culprit. The logic
analyzer told me that INT# was being asserted (active low) right out of
the gate. Removal of the chips that connect to INT# and inserting them
one at a time until the symptom re-appeared revealed the CTC chip as
having a problem.
Very good explanation, Tony!
Is there any chance that he might need to worry about a pack being inside the
drive with the heads un-parked, e.g. from an abrupt power failure?
--
Mark J. Blair, NF6X
http://www.nf6x.net/
Excellent descriptive instructions. Ill print them out. Thanks.
On Sun, Jul 12, 2015 at 9:21 AM, tony duell wrote:
>
> > Thank you all for the excellent information. I think i have a pretty
> clear
> > idea on what im dealing with now. Quick question though, what if there
> is a
> > pack in the
> It’s a fairly pristine example (32KB) with dual 8” floppies. It also
> came with a few manuals including the Maintenance Information Manual as
> well as the Computing System Logic Manual (still shrink wrapped). It
> also has a serial I/O diskette and a diagnostic diskette.
>
Guy,
Congratulati
I had acquired an IBM 5120 a few months ago but I didn’t have time to really
check it out.
It’s a fairly pristine example (32KB) with dual 8” floppies. It also came with
a few manuals
including the Maintenance Information Manual as well as the Computing System
Logic
Manual (still shrink wrappe
BTW, if there are particular cards you need / are bad, in addition to
the actual PDP-12, I have the backplanes and cards for a 2nd one, so if
you need something, we could probably work something out.
JRJ
On 7/11/2015 8:02 PM, Michael Thompson wrote:
> J. Victor Nahigian donated some M221 and M22
Tony,
thanks for the link to Roytron! That's a lot of good stuff there.
(I was searching for "Royal typewriter" stuff
Joerg
Am 12.07.2015 um 15:28 schrieb tony duell:
I've read somewhere the mechanical puncher unit is not made by DEC but
by some other company.
Is there any known documentat
Am 12.07.2015 um 15:47 schrieb Johnny Billquist:
On 2015-07-12 15:40, Jörg Hoppe wrote:
Am 12.07.2015 um 14:40 schrieb Johnny Billquist:
On 2015-07-12 13:55, Jörg Hoppe wrote:
Hi,
I have an broken DEC PC05 puncher unit here.
It seems the shaft which transfers motor power to the excente
On 2015-07-12 15:40, Jörg Hoppe wrote:
Am 12.07.2015 um 14:40 schrieb Johnny Billquist:
On 2015-07-12 13:55, Jörg Hoppe wrote:
Hi,
I have an broken DEC PC05 puncher unit here.
It seems the shaft which transfers motor power to the excenter mechanism
is broken in the inside.
So i need to d
On 2015-07-12 15:28, tony duell wrote:
I've read somewhere the mechanical puncher unit is not made by DEC but
by some other company.
Is there any known documentation about the DEC PC05 puncher ?
There are several manuals at bitsavers. Why didn't you even bother
checking before posting?
http:
> > I've read somewhere the mechanical puncher unit is not made by DEC but
> > by some other company.
> >
> > Is there any known documentation about the DEC PC05 puncher ?
>
> There are several manuals at bitsavers. Why didn't you even bother
> checking before posting?
> http://bitsavers.trailing
> > And which of those manuals covers the punch mechanism? Did you bother to
> > read
> > any of them before flaming?
>
> Yes, I did check. The first manual in that list do cover it in some detail.
It covers the reader, but there is very little information on the punch
mechanism. Certainly
no
Am 12.07.2015 um 14:40 schrieb Johnny Billquist:
On 2015-07-12 13:55, Jörg Hoppe wrote:
Hi,
I have an broken DEC PC05 puncher unit here.
It seems the shaft which transfers motor power to the excenter mechanism
is broken in the inside.
So i need to dissassemble the whole unit, but have no
On 2015-07-12 13:55, Jörg Hoppe wrote:
Hi,
I have an broken DEC PC05 puncher unit here.
It seems the shaft which transfers motor power to the excenter mechanism
is broken in the inside.
So i need to dissassemble the whole unit, but have no idea where to start.
I've read somewhere the mechan
> Thank you all for the excellent information. I think i have a pretty clear
> idea on what im dealing with now. Quick question though, what if there is a
> pack in the drive? What holds the pack in there? Can the pack be removed
> without power?
Believe-it-or-not the pack is held to the spindle
Hi,
I have an broken DEC PC05 puncher unit here.
It seems the shaft which transfers motor power to the excenter mechanism
is broken in the inside.
So i need to dissassemble the whole unit, but have no idea where to start.
I've read somewhere the mechanical puncher unit is not made by DEC but
Note that the bracket should already be there; just loosen the screw,
rotate the plate 90 degrees to block the positioner-mount, and then tighten
the screw again. I *think* that the bottom drive-retention screws are
interchangeable with screws on the back-panel, and a typical approach is to
remove
Thank you all for the excellent information. I think i have a pretty clear
idea on what im dealing with now. Quick question though, what if there is a
pack in the drive? What holds the pack in there? Can the pack be removed
without power?
On Sun, Jul 12, 2015 at 3:24 AM, Paul Birkel wrote:
>
An update: Although I still expect there is an issue with that loop
count of 10 (0x0A), I went ahead and stuck my logic analyzer on it in
state mode just to see what, if anything, was going on.
The CPU is running and runs the program in the ROM as expected at first.
But the program gets to the p
If you are missing other PDP-12 maindecs or docs, let me know - I may
well have them and would be happy to scan them.
JRJ
On 7/11/2015 8:02 PM, Michael Thompson wrote:
> J. Victor Nahigian donated some M221 and M222 boards for the processor and
> TC12 LINCtape controller. They are in pretty bad
J. Victor Nahigian donated some M221 and M222 boards for the processor and
TC12 LINCtape controller. They are in pretty bad condition, but are
repairable. Warren wrote a test program for the M222 boards, and some of
the just donated boards actually work OK. It will be nice to have some
spares.
Da
Oh, yeah I get it - an in circuit emulator. With my logic analyzer I
can also watch all the bus transactions (or directly on the CPU if needs
be) to see what is going on, as well.
I have an Intel MDS IV with an ICE for (IIRC) an 8051, but have never
used it for that purpose to date.
JRJ
On 7/11
heh thats way more work than a plug in emulator
good luck on it
On 7/11/2015 2:49 PM, Jay Jaeger wrote:
> Oh, yeah I get it - an in circuit emulator. With my logic analyzer I
> can also watch all the bus transactions (or directly on the CPU if needs
> be) to see what is going on, as well.
>
>
no not a software emulator a hardware emulator you remove the Z80 and
plug in a cable
lets you step through the code test memory and run the board at full speed
hardware emulators are for the debugging of the hardware.
unlike software emulators that run on a host PC that let you run old
software
The RL01/RL02 Users Guide (bitsavers.org/pdf/dec/disc/rl01_rl02) Figure
2-25 on page 2.35 describes the positioner restraining bracket that
should be put in place before shipping. It is just a little square
piece of metal (probably aluminum) with a single screw that holds it
down that sits in fron
In working on my ACS 8000-2, I managed to dump the ROM and started
disassembling it, and almost immediately came up with something strange
(see below). As a result, it is not surprising the machine is totally
confused.
If anyone has an Altos ACS 8000, models 1 thru 4 or 1S thru 4S, that is,
an Al
I use emulators as well, and have written some, but I also enjoy working
with the real hardware.
The Altos ACS-8000 series are all Z80's .
JRJ
On 7/10/2015 10:05 PM, wulfman wrote:
> On 7/10/2015 7:50 PM, Jay Jaeger wrote:
>> Long story, but
>>
>> I recently acquired an Altos ACS 8000-2 with
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