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
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 14/09/2020 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
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-
>
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
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
> 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'
> 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
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 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 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 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
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
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
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
>> 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?
>>
> 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
>> 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
.
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
> 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.
>>
>>
>>> 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 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
> > 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
> 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,
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
> 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
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
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.
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
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
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
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
>> > 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 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.
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 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
>
> 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
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
>
> 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
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
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.
>
> Yea
> 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
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