Hi Nigel,
Toby Thain is currently without access to email but would like to speak
to you about an RQDX3. He asked me to email you on his behalf. Would you
be able to call him?
Cheers,
Aaron
Nigel Johnson Ham via cctalk writes:
> Hi folk,
>
> I am still looking for a DQ696 to allow me to get ES
> In my pile of DEC computer stuff I have a DEC qbus IBV11 IEEE-488
> controller board (M7954) with cable (BN11-A) that connects to the GPIB bus.
>
> It would be interesting to try this out, but I don't have the DEC
> 'Instrument Bus Subroutines' that work under RT-11. Does anyone have
> this packa
> Pete Turnbull via cctalk writes:
>
>> On 21/09/2021 20:34, Chris Zach via cctalk wrote:
>>> Can an MXV11 be used in a 22 bit system? I thought it was an 18 bit
>>> device?
>>
>> MXV11-B is 22-bit. MXV11-A is 18-bit but supposedly can be used in a
>> 22-bit system if the RAM is disabled.
>
> Yea
In-reply-to: <87czp1obv4@carbon.nat.rhwyd.co.uk>
Aaron Jackson via cctalk writes:
> Pete Turnbull via cctalk writes:
>
>> On 21/09/2021 20:34, Chris Zach via cctalk wrote:
>>> Can an MXV11 be used in a 22 bit system? I thought it was an 18 bit
>>> device?
>&
Pete Turnbull via cctalk writes:
> On 21/09/2021 20:34, Chris Zach via cctalk wrote:
>> Can an MXV11 be used in a 22 bit system? I thought it was an 18 bit
>> device?
>
> MXV11-B is 22-bit. MXV11-A is 18-bit but supposedly can be used in a
> 22-bit system if the RAM is disabled.
Yeah this is
>
> This is an interesting amount of physical memory to report (1152K). What
> memory board(s) do you have installed?
>
> Other than that, this output looks sane to me. I'd suggest booting XXDP
> and running CPU, memory diagnostics from there.
>
> - Josh
Thanks, I forgot about XXDP. I have ran a
Hi all,
My PDP-11/73 has started misbehaving after several years of being very
stable. It is showing symptoms similar to when I've forgotten to enable
the LTC in the past, except this time, it is enable.
Power supply seems good - +5V, +12V, all seems there and appears to be
stable. I've probed th
>
> Aaron,
>
> One thing I would check is the motor bearings. What happens on electro
> mechanical assemblies left in store for years is that ball bearing
> grease lube dries out and hardens, resulting in lumpy rotation and
> increased friction that can be detected by rotating the spindle by
> hand
On 22 December 2020 at 22:17 GMT, shad via cctalk wrote:
>> The ready lamp flashes not when the servo burst is >visible, but when the
> heads are just before it.
>> Why? Well, I probably set the gain too high on the read/write module.
>
> Hello,
> I'm sure you read the manual, however I add som
On 22 December 2020 at 10:33 GMT, Aaron Jackson via cctalk wrote:
> On 22 December 2020 at 08:01 GMT, Christian Corti via cctalk wrote:
>
>> On Mon, 21 Dec 2020, Aaron Jackson wrote:
>>> The status currently is that the heads will load, and the ready lamp
>>> flashe
On 22 December 2020 at 08:01 GMT, Christian Corti via cctalk wrote:
> On Mon, 21 Dec 2020, Aaron Jackson wrote:
>> The status currently is that the heads will load, and the ready lamp
>> flashes as the heads wobble back and forth very slightly, trying to lock
>> onto the outer servo guard band.
>> > I've posted a few times over the years about RL02 drives and my
>> > difficulty getting them working (no luck so far!). I've spent the past
>> > few days working on one of them and have made some progress.
>> >
>> > The status currently is that the heads will load, and the ready lamp
>> > flas
On 21 December 2020 at 19:08 GMT, Aaron Jackson via cctalk wrote:
> Supposedly if the main drive motor is bad it will emit noise and cause
> the tachometer (just a coil of wire on the head carriage) to produce
> spikes. Mine does look quite noisy but I'm not sure what's ca
Hi everyone
I've posted a few times over the years about RL02 drives and my
difficulty getting them working (no luck so far!). I've spent the past
few days working on one of them and have made some progress.
The status currently is that the heads will load, and the ready lamp
flashes as the heads
rote:
>>
>> > Aaron,
>> >
>> > Which SCSI card do you have? These systems are normally DSSI systems
>> > not SCSI You should be able to do SHOW DEVICE then BOOT
>> >
>> > Dave
>> >
>> >> -Original Message-
>
> On 14/09/2020 15:02, Aaron Jackson via cctalk wrote:
>> Hi Dave,
>>
>> In my ignorance I incorrectly assumed the DHQ11 was a SCSI controller
>> because it has compatible centronics sockets. Thinking about the name
>> that was obviously wrong!
>
> For the
ms not
> SCSI
> You should be able to do SHOW DEVICE then BOOT
>
> Dave
>
>> -Original Message-----
>> From: cctalk On Behalf Of Aaron Jackson
> via
>> cctalk
>> Sent: 14 September 2020 13:36
>> To: Aaron Jackson ; General Discussion:
> O
On 14 September 2020 at 00:17 BST, Aaron Jackson via cctalk wrote:
> Hi
>
> I've had a VAX 4000/300 sitting around for the past couple of years. The
> second time I tried to switch it on there was a bit pop from the power
> supply. The 12v module of the H7874 PSU is complet
Hi
I've had a VAX 4000/300 sitting around for the past couple of years. The
second time I tried to switch it on there was a bit pop from the power
supply. The 12v module of the H7874 PSU is completely dead and despite
my best efforts I have not been able to fix it.
Tonight I decided to remove tha
>> 1. If the EHT lead was not properly connected to the CRT anode, could
>> that cause problems?
>
> Possibly. I have VT220 terminal which was making a smell of ozone when it was
> running which I should have done something about but never got around to.
> This could have been due to corona disc
I have a DEC VR290 colour monitor for use with VAXstations. It was
working fine when I last powered it on (2-3 years ago), hooked up to a
3100 M76.
It's free to a good home (preferably a home with a VAX), absolutely
collection only. I'm in Nottingham UK. It's too heavy and large to ship
safely.
I
Awesome! thanks for sharing this.
Aaron
On 21 October 2019 at 14:37 BST, Mattis Lind via cctalk wrote:
> I got heaps of documentation from an ex-DEC field service engineer.
>
> Among them there were a VT420 print set. I didn't see any schematics for
> the VT420 on bitsavers so even though this o
> Starting around the VMS 5.5 era, isn’t anything from then or later on
> the Condist documentation CD’s? And thus we don’t have to make a
> priority for scanning?
The stuff I have is mostly pre 4.5.
Aaron
Dispatch July 1985
> AD-L034A-32VAX / VMS System Dispatch July 1986
>
> http://aaronsplace.co.uk/dec-manuals.html This page has been updated to
> reflect what has already digitised.
>
> Thanks,
> Aaron
>
> Aaron Jackson via cctalk writes:
>
>> I have a full book case
Dispatch July 1986
http://aaronsplace.co.uk/dec-manuals.html This page has been updated to
reflect what has already digitised.
Thanks,
Aaron
Aaron Jackson via cctalk writes:
> I have a full book case of DEC binders, each containing one or more
> manuals. I went through the lot of it this evening a
> On 8/24/19 12:18 AM, Aaron Jackson via cctalk wrote:
>> I have a full book case of DEC binders, each containing one or more
>> manuals. I went through the lot of it this evening and checked to see
>> what was on bitsavers. It seems an awful lot of it is not available.
>
> On 24/08/2019 08:18, Aaron Jackson via cctalk wrote:
>> I'm going to try to scan as much as I can. The full list of what I have
>> is available at the link below. It is mostly mid 1980's VAX/VMS
>> stuff.. If anyone would like one of the manuals for the cost of
I have a full book case of DEC binders, each containing one or more
manuals. I went through the lot of it this evening and checked to see
what was on bitsavers. It seems an awful lot of it is not available. I
cannot bring myself to dispose of any of it until it is digitised, but
keeping hold of thi
Very nice photos although I am confused by some. Some of them appear to
be moving but a lot of stuff stays still. What is happening??
This one for example:
https://photos.google.com/share/AF1QipMxQT03fXAj3rZSF8jUm5IrLnmLnVYTTP_hgiNtZ6z-0-pKjaFeKB3aw1ItxldqKA/photo/AF1QipPyuT8UHx84MIB-PxX5L04jePbF6
There is a TCP/IP stack available for RT-11, although I've never tried
it. It apparently works with both DEQNA and DELQA cards, and I suspect
you've got one or the other in your 11/23.
http://shop-pdp.net/rthtml/tcpip.php
It is possible, but also very painful, to view websites using the telnet
cl
On 15 April 2019 at 07:35 BST, Ethan Dicks wrote:
> On Mon, Apr 15, 2019 at 1:16 AM Kevin McQuiggin (SFU) via cctalk
> wrote:
>> Not in the UK, but Mitch Miller at Keyways Inc (keyways.com) has
>> tested/working cards at reasonable prices. I had the same issue on a recent
>> MicroVAX II upgrade
Unsurprisingly the DEQNA card in my PDP-11/73 is quite unstable and
results in 2.11BSD panicing. Is there anything that can be done about
this? Other than unplugging it that is... I don't think there very much
broadcast traffic making its way to the PDP. It's usually when I'm
transferring files.
I
Glad the 23 PSU seems to be working again.
My H7861 had a fault a couple of years ago where the 12V rail stopped
working. It turned out to be a dead 555 timer, totally
flat-lined. Perhaps it would be worth checking that in your H7861 if it
is the MJE15030 that is blowing. At least it's a nice powe
TU-58 support wouldn't need to be in the kernel, it could easily run in
user space. Perhaps someone had written an application in user-space to
dump TU-58 tapes.
Aaron.
Bill Gunshannon via cctalk writes:
> Here's a question for someone who has been around long enough to
> remember.
>
> Why did
If it is anything like installing NetBSD, which I have done on a
VAXstation with a DLT4 drive, it should be 512 byte.
So, while I do not know for sure for Ultrix and MicroVAX, 512 is
probably a good starting point? Hopefully someone else will *actually*
know.
Aaron
Warren Toomey via cctalk wri
Great news, Paul!
I'll try and give this a go this weekend.
Aaron
Paul Koning via cctalk writes:
> Gentlepeople,
>
> Once in a while people ask about GCC. It has long had pdp11 support,
> but it hasn't received much attention. Recently I've done some
> cleanup on it, and some more is in the
018 at 9:04 AM, Holm Tiffe via cctalk > wrote:
>
>> Aaron Jackson via cctalk wrote:
>>
>> > > On Thu, 7 Jun 2018, Aaron Jackson wrote:
>> > >> The VAX turns on and the status LED stays on F. The DC lamp does not
>> > >> illuminate on the PSU.
Thanks Bill. I emailed him, some decent advice but mostly prices :)
Aaron
Bill Degnan writes:
> There is a guy named at Joel from global-itcorp.com who has experience with
> these, he may have an idea. Tell him you spoke with Bill Degnan.
> b
>
> On Thu, Jun 7, 2018 at 3:49 PM
> On Thu, 7 Jun 2018, Aaron Jackson wrote:
>> The VAX turns on and the status LED stays on F. The DC lamp does not
>> illuminate on the PSU. 5V rail appears fine but there is nothing from
>> the 12V rail. There were some *very* dodgy looking caps which I have
>> replaced, and some *very* exploded M
I am trying to repair a VAX 4000 power supply. Does anyone have the
schematics? I can't find anything on BitSavers and I'm not completely
convinced it was even designed by DEC.
The VAX turns on and the status LED stays on F. The DC lamp does not
illuminate on the PSU. 5V rail appears fine but ther
> I see some company selling them on eBay for $122. Are they really worth
>
> anything like that? I have a couple sitting around here somewhere that I
>
> don't expect to ever use again. Just wondering if they are worth looking
>
> for to sell. In this hobby you can always use money for new (well,
> > From: Aaron Jackson
>
> > I have tried three controllers, two r/w modules and two servo
> > controllers. I'm beginning to think the drive is fine and there is a
> > problem with the RLV21 controller.
>
> Err, think you mean RLV12 QBUS controller board, right?
Woops, yes! I get
> On Sat, Mar 31, 2018 at 11:04 AM, Noel Chiappa via cctalk <
> cctalk@classiccmp.org> wrote:
>
>> > From: Aaron Jackson
>>
>> > I have tried three controllers, two r/w modules and two servo
>> > controllers. I'm beginning to think the drive is fine and there is a
>> > problem with
>>> It is also possible that a capacitor has deteriorated in the
>>> timeout one-shot
>>
>> I was beginning to wonder if it was a capacitor
>
> FWIW, while restoring my 11/45 and its RK11-C, I found several failed 74LS123
> dual one-shots in various places.
>
> Haven’t looked at the RL02 drawings
>>> It is also possible that a capacitor has deteriorated in the
>>> timeout one-shot
>>
>> I was beginning to wonder if it was a capacitor
>
> FWIW, while restoring my 11/45 and its RK11-C, I found several failed 74LS123
> dual one-shots in various places.
>
> Haven’t looked at the RL02 drawings
> On 03/30/2018 08:26 AM, Aaron Jackson via cctalk wrote:
>>
>> Is it possible (or even likely) that the carriage survo is a bit sticky?
>> I have a couple of these survos spare, but don't really want to mess
>> with the carriage unless I have to.
>>
>>
.
If anyone is interested, I have screen caps of some of the alignments
and checks from the manual here:
http://aaronsplace.co.uk/blog/2018-03-29-rl02-possible-problem.html
Thanks,
Aaron.
Aaron Jackson via cctalk writes:
> Sorry to keep bothering you all with RL02 questions. I think I am near
>> So, from what I can see, the drive should spin up correctly, but for
>> some reason it goes into fault mode. I am right in thinking that upon
>> load, the heads should continue moving forward until the first track is
>> found, right? I should not have to perform a seek manually f
So, from what I can see, the drive should spin up correctly, but for
some reason it goes into fault mode. I am right in thinking that upon
load, the heads should continue moving forward until the first track is
found, right? I should not have to perform a seek manually from the
> On 03/26/2018 04:08 PM, Aaron Jackson via cctalk wrote:
>>>> So, from what I can see, the drive should spin up correctly, but for
>>>> some reason it goes into fault mode. I am right in thinking that upon
>>>> load, the heads should continue moving forw
>> So, from what I can see, the drive should spin up correctly, but for
>> some reason it goes into fault mode. I am right in thinking that upon
>> load, the heads should continue moving forward until the first track is
>> found, right? I should not have to perform a seek manually from the PDP?
>>
it is doing...
Aaron Jackson via cctalk writes:
> Hi Andrea,
>
> Thanks for your suggestions.
>
> Checking the amplified output from the r/w heads is one of the first
> things I did. The voltages are within normal range, but only after I
> push the head a bit further into the
Hi Andrea,
Thanks for your suggestions.
Checking the amplified output from the r/w heads is one of the first
things I did. The voltages are within normal range, but only after I
push the head a bit further into the pack.
Although, I did not set the jumper to try the other head (I suppose I
was a
Sorry to keep bothering you all with RL02 questions. I think I am nearly
there.
It seems my head cleaning in a warm bath of isopropyl alcohol was a
success. I bought a tested RL02 pack and loaded it - no bad sounds, I
can extend the heads all the way. So that's good. I have supposedly a
working RL
> > I am wondering if anyone would be willing to sell me an RL02K cartridge
> > for a sensible price?
>
> There are a bunch listed on eBait for not wholly unrealistic prices; I
> wouldn't buy a bunch there, but it you only need one, for testing... Not sure
> if any of the ones for sale ther
> Hi Aaron,
> I have some extra RL02 packs and would be glad to lend you a pack for
> free if you like; maybe for keeps. But you're probably not on the same
> continent as me, so shipping would probably be costly. If you have no
> better offers, let me know and we'll work it out. Can also put
>>
>> I posted some pictures of the process here:
>>
>> http://aaronsplace.co.uk/blog/2018-02-19-repairing-crashed-RL02-heads.html
>>
> Looking at the pictures of the heads before and after I am struggling to see
> a difference. What am I looking for?
>
> Regards
>
> Rob
If you click on the image
Hi all,
Inspired by CuriousMarc's recent video, I cleaned and fixed my RL02
heads. Not with an ultrasonic cleaner unfortunately, but in a warm IPA
bath. It worked! Loading a crashed pack is obviously not a good idea,
although I cleaned the cartridge well, and figured with bad heads and a
bad pack,
> I've got two RL02 units. One is a parts unit and has an access plate for
> the door solenoid. I can open it. The other has no access plate nor is
> there a cutout for one. How do I open this cover with the power off? This
> is a newer unit as it has head lock screws on the bottom of the dri
> 1) The EMI filter had gone open-circuit - it's one of those metal can types
> which is integrated with the IEC power input connector. Are these still
> obtainable anywhere? It seems like equipment these days just has the
> filtering directly on the PSU board, rather than as a separate module. I'
Thank you Toby, for posting this, and for putting me in touch with Marc
in the first place.
I first met Marc in person at a talk at our university from Brian
Kernighan. While I nervously asked bwk to sign my copy of C, Marc had no
trouble initiating a conversation wit him. Marc managed to persuade
I asked a while back, but thought I'd try again. I'm looking for a
replacement flyback transformer for a VT220-F, part number 16-26299-01
by TAI HO. I've found a few online, a bit higher priced than I'd like,
especially after import tax. If you have one you'd be willing to sell,
please get in touch
Does anyone have a copy of the manual for the ADAC 1664ATTL 64bit
parallel I/O Q-bus card?
Thanks,
Aaron.
> On 12/17/17 9:04 AM, Aaron Jackson via cctalk wrote:
>> I unloaded very quickly but I think the damage is done.
>>
>
> I KNOW the damage is done.
>
> NEVER attempt to load a pack if you haven't inspected it AND the heads
> first.
The pack was cleaned with lin
>> -Original Message-
>> From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Aaron
>> Jackson via cctalk
>> Sent: 17 December 2017 17:56
>> To: Aaron Jackson ; General Discussion: On-Topic
>> and Off-Topic Posts
>> Subject: Re: RL
>> I wonder if you fell into the 'trap for the unwary' here. The heads are
>> named by
>> the direction they face. So the upper head, nearest the top of the drive, is
>> the 'down' had as it faces down onto the platter. Similarly the lower
>> head is the
>> 'up' head. Yes, it confused me at first,
> On Sun, Dec 17, 2017 at 5:04 PM, Aaron Jackson via cctalk
> wrote:
>> Now that I have my RX02 drive working I have started to take a look at
>> the RL02 drives again. I hooked a scope up to the sector transducer and
>> sector timing test points, and they look nicel
>> Does anyone understand what might have happened?
> Simple the heads are designed to fly and have a shape suited for that.
> Flip them over and they are wrong shape, they don't fly, they dig in
> oops!
Yes I understand that, but why didn't it damage my platter when they
were connected (elect
Now that I have my RX02 drive working I have started to take a look at
the RL02 drives again. I hooked a scope up to the sector transducer and
sector timing test points, and they look nicely aligned. So I moved on.
Then I hooked up the scope to the TP1, TP2 and the sector timing TP and
compared it
> 1.) It is not posible to switch the console from RS232 to the VGA
> Monitor and Keyboard. If i switch the S3 switch in down position i can
> only see the NetBSD Kernel decompression. After that i see nothing on
> VGA and RS232 console. The System starts up anyway. After some time it
> is possible
t as it attempts a retry. The number of
>> retries
>> is configurable via a SET command.
>>
>> For files with an RT11 Directory, DIR/BAD/FILES will include the file
>> name
>> of files affected by unreadable blocks.
>>
>> You can do the
y/FM,
> of course). If you want RX02 media there's an XXDP routine to upconvert
> RX01s to RX02s.
>
> Thanks,
> Jonathan
>
> On Sat, Dec 16, 2017 at 2:02 PM, Chuck Guzis via cctalk <
> cctalk@classiccmp.org> wrote:
>
>> On 12/16/2017 10:43 AM, Fred Cisin
> > From: Aaron Jackson
>
> > It was the disks after all.
>
> Well, I'm glad you got it working. Where'd you get a good floppy?
>
> Noel
Friend popped over with an RX02 drive and a working RT-11 floppy. The
drive worked with my controller so I tried the disk in my own drive and
it bo
Well, would you believe it. It was the disks after all. I can't believe
they are all bad!
Just booted straight into RT-11.
Thanks all for your help anyway. Time to play.
Aaron.
Aaron Jackson via cctalk writes:
> Hi everyone,
>
> I originally posted this on VCFed (which was
Noel Chiappa via cctalk writes:
> > Aaron Jackson
>
> > if I try to dump using vtserver using a floppy which passed the
> > diagnostics, it fails.
>
> My copy of of the V7 standalone stuff (which I got from the VTServer
> directory) didn't include an RX driver. Where'd you manage to f
> On Dec 8, 2017, at 5:17 PM, Aaron Jackson wrote:
>>
>>>> On Dec 8, 2017, at 12:53 PM, Aaron Jackson via cctalk
>>>> wrote:
>>>>
>>>>> On Fri, Dec 8, 2017 at 3:03 PM, Aaron Jackson
>>>>> wrote:
>>>>>&g
>> On Dec 8, 2017, at 12:53 PM, Aaron Jackson via cctalk
>> wrote:
>>
>>> On Fri, Dec 8, 2017 at 3:03 PM, Aaron Jackson
>>> wrote:
>>>>
>>>> Manual says it should be S1=off, S2=on for RX211 and RXV21
>>>
>>> In th
> > From: Aaron Jackson
>
> > Most of the tests now look something like this:
> > ...
> > SECTOR ADDRESS ERROR
> > EXPECTED SECTOR=18.
> > TARGET SECTOR=17.
>
> I wonder if there's a problem with the floppy you are using?
>
> Remember, the RX0x drives can't hard refor
> On Fri, Dec 8, 2017 at 3:03 PM, Aaron Jackson wrote:
>>
>> Manual says it should be S1=off, S2=on for RX211 and RXV21
>
> In the photo, I think S1 is on and S2 is off. Check them with an
> ohmmeter if in doubt!
>
> -tony
Yes - you are right. I switched them back to how they were when I got
the
> On Fri, Dec 8, 2017 at 2:45 PM, Aaron Jackson via cctalk
> wrote:
>
>> - Strapped RX01 - I don't know what this means
>>
>> - PDP8 - eh?
>
> No idea as to the fault (heck, it's not in front of me with a logic analyser
> to hand), but I think
Hi everyone,
I originally posted this on VCFed (which was new to me) but the
moderation queue has had me waiting for about 3 days, so I thought I'd
ask here as well, the usual of gurus. :)
I was recently sent an RXV21 controller so I could test out my RX02
drive. When I power up the PDP-11 or res
Thanks Glen and Jerry.
I think that settled that debate! haha
Thanks,
Aaron.
Glen Slick writes:
> An M5976 KZQSA is not MSCP compatible so it wouldn't do any good with a
> PDP-11 system. It's really only useful for RRD4x SCSI CD-ROM drives with
> VMS on a VAX 4000.
>
> On Dec 6, 2017 9:47 AM,
I'm looking after a VAX 4000 for a friend, which has a SCSI Q-bus card
(M5976). If the card did not have the large metal face, would it work in
a Q-bus PDP-11? We are not going to potentially ruin a card by trying
this, but I am interested to know if this is the case.
Thanks,
Aaron.
I'm looking after a VAX 4000 for a friend, which has a SCSI Q-bus card
(M5976). If the card did not have the large metal face, would it work in
a Q-bus PDP-11? We are not going to potentially ruin a card by trying
this, but I am interested to know if this is the case.
Thanks,
Aaron.
Never mind. The manual is not particularly clear. It is for a Shugart
drive, which can read/write to RX02 floppies, but does not work with an
RX02 drive.
Ah well!
Thanks,
Aaron.
Aaron Jackson writes:
> Hi all,
>
> I was given an MTI MXV21 controller which is apparently compatible with
> the RX
Hi all,
I was given an MTI MXV21 controller which is apparently compatible with
the RX02 drive. The card has a 50 pin header, but the RX02 drive has a
40 pin ribbon cable. Does anyone know what am I missing here?
I don't see anything about this in the manual:
http://bitsavers.informatik.uni-stut
You might be surprised how many LCD monitors support SoG. I have several
iiyama LCD panels which work fine with a 3100.
Aaron.
Douglas Taylor via cctech writes:
> I have a couple of vaxes that output 'unique' video, Alpha 3000 300,
> Alpha 3000 400, Vax 4000 VLC, and Vax Station 3100 M76.
>
> T
>>
> Could elaborate a bit on this part of your earlier message.
>
>> I managed to boot into XXDP today using tu58em and ran the RLV12
>> controller test. It seems though that the version of XXDP I loaded does
>> not support the 22bit address (17774400) and defaults to the 16bit
>> address (17440
> Aaron,
>
> Do not underestimate the need for termination, even with a very short
> external cable.
> When you factor in the internal cables runs, crosstalk or signal reflections
> which interfere
> with operation may still be present, especially when data transfers start.
>
> If you have acces
It sounds silly but I don't actually have access to a Windows machine,
but PD11GUI looks nice.
I managed to boot into XXDP today using tu58em and ran the RLV12
controller test. It seems though that the version of XXDP I loaded does
not support the 22bit address (17774400) and defaults to the 16bit
A few years back I wanted to study at Manchester uni, primarily so I
could apply to be a demonstrator for the SSEM.
Sad news.
Dave Wade via cctalk writes:
> https://www.theguardian.com/global/2017/nov/08/geoff-tootill-obituary
>
>
>
> Dave Wade
>
> G4UGM & EA7KAE
>
>
--
Aaron Jackson
PhD
>> -Original Message-
>> From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Tomasz
>> Rola via cctalk
>> Sent: 07 November 2017 18:26
>> To: General Discussion: On-Topic and Off-Topic Posts
>> Cc: Zane Healy
>> Subject: Re: List Problems?
>>
>> On Sun, Nov 05, 2017 at 09:46:
>> On Nov 6, 2017, at 10:21, Aaron Jackson via cctalk
>> wrote:
>>
>> I based my terminator off Mark
>> Blair's RL02 to USB project:
>>
>> https://github.com/NF6X/RL02-USB/blob/master/pcbs/RL02-USB-terminator/RL02-USB-terminator.pdf
>
> H
william degnan writes:
> On Sun, Nov 5, 2017 at 12:43 PM, Aaron Jackson via cctech <
> cct...@classiccmp.org> wrote:
>
>> Hi everyone,
>>
>> I have managed to hook up an RL02 drive to my PDP-11 (thanks to Dave
>> Wade for the drives) . This took me longer than I thought it would - I
>> tried with
master/pcbs/RL02-USB-terminator/RL02-USB-terminator.pdf
Aaron.
Aaron Jackson via cctalk writes:
> Hi everyone,
>
> I have managed to hook up an RL02 drive to my PDP-11 (thanks to Dave
> Wade for the drives) . This took me longer than I thought it would - I
> tried with a flat ribbo
Hi everyone,
I have managed to hook up an RL02 drive to my PDP-11 (thanks to Dave
Wade for the drives) . This took me longer than I thought it would - I
tried with a flat ribbon cable with a DIY terminator going straight into
board , but couldn't get it to work. Removed the terminator, and the
fau
Thanks! It was very satisfying and not the worst thing to go wrong
for a beginner.
I was also quite surprised that such a simple component would die,
and what I find more confusing is that it died while I was using
the machine.
Aaron.
Noel Chiappa via cctalk wrote:
> > From: Aaron Jackson
Picked up a few 555s and sockets and now it works! I am very
happy. Going from not knowing how switch mode power supplies work, to
watching some YouTube videos, and then finally being able to debug the
problem and fix it was a lot of fun.
I wonder what will die next.
Thanks,
Aaron.
Rob Jarratt
That's good to know. I'll head over to Maplin after work and pick up
some timers and sockets.
I removed one of the suspicious ceramic caps and tested it and it came
out fine. The other cap is shared with the other oscillator so I assume
it is fine.
Thanks!
Aaron.
Rob Jarratt via cctech wrote:
Just had another look after watching a video about how switch mode power
supplies work On the small control board connecting to J4, there are
two D44Q1 transistors. As expected, there is about 65KHz going into the
base of the transistor for the 5V side. However, there is no signal
going into th
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