Search found 6990 matches

by 1024MAK
Fri Feb 23, 2018 11:29 am
Forum: off-topic
Topic: Thermionic Valves
Replies: 25
Views: 728

Re: Thermionic Valves

I still have my grandfather's Leak Stereo 50 - EL34 and ECC83 valves in it - I replaced some that had failed in the 80's and think some of them are Mullard ones. Also have the Leak Point One preamp, Leak FM Tuner, Garrard 301 turntable and a Brenell Mk5 reel-to-reel tape desk (a grey mono version),...
by 1024MAK
Fri Feb 23, 2018 11:16 am
Forum: off-topic
Topic: Did You Know?
Replies: 7
Views: 407

Re: Did You Know?

Ahh, the eye of the needle video :lol:

Although I had heard of these before, I had not seen any for sale. So when I saw that video yesterday, I ordered a set.

Mark
by 1024MAK
Thu Feb 22, 2018 6:41 pm
Forum: hardware
Topic: AP5, Pegasus/AP3-4/EUPURS Metal Case Design
Replies: 12
Views: 487

Re: AP5, Pegasus/AP3-4/EUPURS Metal Case Design

daveejhitchins wrote:Just a quick update . . . Taking a lot longer than anticipated - sorry . . . Cases into the paint shop early next week.

Dave H :D

Sounds like good progress :D

I look forward to receiving some from you :wink:

Mark
by 1024MAK
Thu Feb 22, 2018 6:35 pm
Forum: hardware
Topic: AP5, Pegasus/AP3-4/EUPURS Metal Case Design
Replies: 12
Views: 487

Re: AP5, Pegasus/AP3-4/EUPURS Metal Case Design

...EUPURS... There is 'one' hole that isn't used and becomes our point-of-reference: the centre hole of the battery holder (sorry if you are actually using this, however, IIRC, the battery circuit doesn't work). Not entirely true. The battery backup circuit does have issues (including the battery h...
by 1024MAK
Thu Feb 22, 2018 3:00 pm
Forum: hardware
Topic: OPUS 5802 5 1/4" Disk Drive
Replies: 12
Views: 190

Re: OPUS 5802 5 1/4" Disk Drive

Advertise it in the for sale section on here :wink:

Mark
by 1024MAK
Thu Feb 22, 2018 1:45 pm
Forum: general
Topic: led light range
Replies: 3
Views: 146

Re: led light range

There are roughly three LED types:- ⋅ Single colour LEDs, where the colour (wavelength) is determined by the materials used to make the semiconductor material, these are the traditional IR, red, orange, yellow, green and more recently the blue LEDs, ⋅ LEDs which emit a single col...
by 1024MAK
Wed Feb 21, 2018 6:21 pm
Forum: hardware
Topic: OPUS 5802 5 1/4" Disk Drive
Replies: 12
Views: 190

Re: OPUS 5802 5 1/4" Disk Drive

I don't know about Opus drives specifically, but with most disk drives for the BBC (and other computers that used standard drives), the actual drive inside the case is a generic one.

Mark
by 1024MAK
Wed Feb 21, 2018 5:57 pm
Forum: hardware
Topic: OPUS 5802 5 1/4" Disk Drive
Replies: 12
Views: 190

Re: OPUS 5802 5 1/4" Disk Drive

Have you taken the cover off and had a look inside?

Go on, warm them screwdrivers up...

Mark
by 1024MAK
Tue Feb 20, 2018 10:03 pm
Forum: general
Topic: Today I received.....
Replies: 4435
Views: 276034

Re: Today I received.....

Received yesterday:
IMG_6522.JPG
Myelin's Electron cart/BBC Tube adapter PCB

IMG_6521.JPG
Myelin's Electron cart/BBC Tube adapter PCB
Thanks Dave H. =D>

Received today:
IMG_6520.JPG
Cable drum

Shame, as it's not what I ordered! :lol:

Mark
by 1024MAK
Tue Feb 20, 2018 9:52 pm
Forum: off-topic
Topic: LOLPRICE
Replies: 2715
Views: 203043

Re: LOLPRICE

For sale:
Image
Note computer is spares or repairs, but believed working when last used...
by 1024MAK
Tue Feb 20, 2018 6:00 pm
Forum: hardware
Topic: Screen 'shimmering' on Elk
Replies: 5
Views: 196

Re: Screen 'shimmering' on Elk

Also, is this just when using one display? Or does it do it on another TV/monitor as well?

Mark
by 1024MAK
Mon Feb 19, 2018 7:20 pm
Forum: general
Topic: little optimistic???
Replies: 28
Views: 892

Re: little optimistic???

Absolutely! Commodore failed for a whole bunch of reasons (corporate greed, mismanagement, you name it) but one of the most annoying ones was its habit of resting on its laurels - the amazing (for the time) Original Chipset (OCS) was only slightly improved with the Enhanced Chipset (ECS); the Advan...
by 1024MAK
Mon Feb 19, 2018 2:57 am
Forum: off-topic
Topic: LOLPRICE
Replies: 2715
Views: 203043

Re: LOLPRICE

Surprisingly enough, I have bought items (the last was a ZX81) which were sold as not working / spares / repairs and have found some of them (like the ZX81) to be in working condition. I should say the seller of the ZX81 did not have the Sinclair ZX81 PSU. But yes, far too often, it does mean "...
by 1024MAK
Sat Feb 17, 2018 11:58 pm
Forum: stardot.org.uk
Topic: Stardot logo fixed and now spud and banana free!
Replies: 57
Views: 979

Re: Stardot logo infected with spuds!

Ahh, yessir, the correct StarDot logo is back :D =D> 8)

Mark
by 1024MAK
Sat Feb 17, 2018 11:09 pm
Forum: general
Topic: little optimistic???
Replies: 28
Views: 892

Re: little optimistic???

Some of the chips available on eBay are actually pulled chips from existing equipment. From just looking at it, it's hard to tell if someone has put a modern chip in a form that looks like an older existing DIL chip. The main problem is that some existing chips are being remarked,having their pins r...
by 1024MAK
Sat Feb 17, 2018 11:01 pm
Forum: general
Topic: little optimistic???
Replies: 28
Views: 892

Re: little optimistic???

The price of 1980s and 1990s computers may be high and still going up at the moment. But as time goes on, it is possible that the demand may wane. After all, most people who missed them when at school are not likely to be very interested in them. And some of those people who are buying them to recre...
by 1024MAK
Sat Feb 17, 2018 10:45 pm
Forum: other vintage computer hardware, software and games
Topic: Finding a short circuit
Replies: 5
Views: 175

Re: Finding a short circuit

EPROMs often don't survive being put in the wrong way round if power has been applied... It's not unknown for people who don't know what they are doing to incorrectly insert chips. I bought some ZX81s once that apparently came from a college. Apart from the usual broken keyboard membranes, a lot of ...
by 1024MAK
Sat Feb 17, 2018 5:34 pm
Forum: other vintage computer hardware, software and games
Topic: Finding a short circuit
Replies: 5
Views: 175

Re: Finding a short circuit

Yep, you can do that. If you have access to a thermal infra red camera, that would pinpoint any hot components. Failing that, it's the finger tip test :mrgreen: Does the board have any tantalum capacitors? These are known to fail short circuit. Ceramic capacitors if physically damaged can also go sh...
by 1024MAK
Sat Feb 17, 2018 5:20 pm
Forum: general
Topic: little optimistic???
Replies: 28
Views: 892

Re: little optimistic???

Well, if the current production CMOS 65C02 CPUs and 6522 chips last as long as the older NMOS parts, it is certainly possible...

In the industry where I work, we maintain electrical equipment that was designed in the 1960s, 1970s and 1980s...

Mark
by 1024MAK
Sat Feb 17, 2018 7:30 am
Forum: general
Topic: Today I received.....
Replies: 4435
Views: 276034

Re: Today I received.....

richardtoohey wrote:So have you got a ... chip ... on your shoulder?

Just Mr Potato Head :lol:

Mark
by 1024MAK
Sat Feb 17, 2018 5:41 am
Forum: general
Topic: Today I received.....
Replies: 4435
Views: 276034

Re: Today I received.....

http://stardot.org.uk/forums/download/file.php?mode=view&id=35517&sid=1fc129335089dbda4a22ebf2fdbc5668 http://stardot.org.uk/forums/download/file.php?mode=view&id=35517&sid=1fc129335089dbda4a22ebf2fdbc5668 IMG_6502.PNG http://stardot.org.uk/forums/download/file.php?mode=view&id=...
by 1024MAK
Fri Feb 16, 2018 10:16 pm
Forum: stardot.org.uk
Topic: Stardot logo fixed and now spud and banana free!
Replies: 57
Views: 979

Re: Stardot logo disappeared!

Maybe we should switch emulators to one that matches the new logo?
Like this emulator...

Mark
by 1024MAK
Thu Feb 15, 2018 5:18 pm
Forum: stardot.org.uk
Topic: Stardot logo fixed and now spud and banana free!
Replies: 57
Views: 979

Re: Stardot logo disappeared!

A minor point, but in the "compact" view of the forum that I get when I view it in portrait orientation on my phone, there aren't any text labels next to the Notifications and Messages icons, and the icons themselves (the bell and the envelope) aren't clickable, so I have to turn the phon...
by 1024MAK
Wed Feb 14, 2018 12:22 am
Forum: community projects
Topic: Earliest examples of each machine?
Replies: 30
Views: 2585

Re: Earliest examples of each machine?

I NEED TO SEE AN ISSUE 1!!! :evil: Sorry about the outburst :oops: But I need to see one with my actual eyes :shock: Lee You may will have to wait a while long time, they are rather rare. Some say that not many escaped into the wild. Others say that they were recalled. It's also possible that only ...
by 1024MAK
Sun Feb 11, 2018 4:03 pm
Forum: for sale / freebies
Topic: Worth Taking a Look At
Replies: 2512
Views: 195708

Re: Worth Taking a Look At

As per usual, it was a reasonable price until the last moments (just three bids when I looked), when it went mad!

Mark
by 1024MAK
Sat Feb 10, 2018 6:56 pm
Forum: other vintage computer hardware, software and games
Topic: Solutions for a sheered screw
Replies: 11
Views: 209

Re: Solutions for a sheered screw

Or, replace or extend the Earth wire, and attach it at the other end of the case...

Mark
by 1024MAK
Sat Feb 10, 2018 6:54 pm
Forum: other vintage computer hardware, software and games
Topic: Solutions for a sheered screw
Replies: 11
Views: 209

Re: Solutions for a sheered screw

Drill it out.
Countersink the outside.
Fit a suitable machine screw with star washer, then nut.
Fill in the head of the machine screw with filler.
Paint over it :wink:

Mark
by 1024MAK
Sat Feb 10, 2018 11:56 am
Forum: hardware
Topic: BBC micro black linear PSU repair
Replies: 12
Views: 305

Re: BBC micro black linear PSU repair

daveejhitchins wrote:Has anyone mentioned changing all the Tantalums?

Dave H :D

Martin talks about the Tantalums in his article. It is also mentioned in the linked to thread.

If during testing, problems are found, then yes, it may well be worthwhile changing them.

Mark
by 1024MAK
Sat Feb 10, 2018 1:46 am
Forum: hardware
Topic: BBC micro black linear PSU repair
Replies: 12
Views: 305

Re: BBC micro black linear PSU repair

Steve, the pictures, text and schematic in Martin Jones's article are consistent with there being TWO 4700uF electrolytic capacitors. It looks like there is one on the underside (track) side of the PCB as well as one on the top of the board. But your board does not have a 4700uF electrolytic capacit...
by 1024MAK
Sat Feb 10, 2018 1:28 am
Forum: hardware
Topic: BBC micro black linear PSU repair
Replies: 12
Views: 305

Re: BBC micro black linear PSU repair

Does anyone know if Acorn kept the 3 sections of the later issues main bbc boards isolated? If not then you shouldn't use the linear psu with a later board. At some stage, on one of the later issue boards, Acorn connected all three +5V power points together via the PCB tracks. This applies to the i...